Uses of Class java.lang.Object (FlexDoc/Javadoc 2.0 Demo)

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Uses of Class
java.lang.Object

Packages that use Object
java.io	Provides for system input and output through data streams, serialization and the file system.
java.lang	Provides classes that are fundamental to the design of the Java programming language.
java.lang.annotation	Provides library support for the Java programming language annotation facility.
java.util	Contains the collections framework, some internationalization support classes, a service loader, properties, random number generation, string parsing and scanning classes, base64 encoding and decoding, a bit array, and several miscellaneous utility classes.
java.util.concurrent	Utility classes commonly useful in concurrent programming.
javax.swing	Provides a set of "lightweight" (all-Java language) components that, to the maximum degree possible, work the same on all platforms.
javax.swing.text	Provides classes and interfaces that deal with editable and noneditable text components.
javax.swing.text.html	Provides the class HTMLEditorKit and supporting classes for creating HTML text editors.
javax.swing.undo	Allows developers to provide support for undo/redo in applications such as text editors.
javax.xml.catalog	Provides the classes for implementing XML Catalogs OASIS Standard V1.1, 7 October 2005.
jdk.javadoc.doclet	The Doclet API provides an environment which, in conjunction with the Language Model API and Compiler Tree API, allows clients to inspect the source-level structures of programs and libraries, including API comments embedded in the source.

Uses of Object in java.io

Subclasses of Object in java.io
class	BufferedInputStream A BufferedInputStream adds functionality to another input stream-namely, the ability to buffer the input and to support the mark and reset methods.
class	BufferedOutputStream The class implements a buffered output stream.
class	BufferedReader Reads text from a character-input stream, buffering characters so as to provide for the efficient reading of characters, arrays, and lines.
class	BufferedWriter Writes text to a character-output stream, buffering characters so as to provide for the efficient writing of single characters, arrays, and strings.
class	ByteArrayInputStream A ByteArrayInputStream contains an internal buffer that contains bytes that may be read from the stream.
class	ByteArrayOutputStream This class implements an output stream in which the data is written into a byte array.
class	CharArrayReader This class implements a character buffer that can be used as a character-input stream.
class	CharArrayWriter This class implements a character buffer that can be used as an Writer.
class	CharConversionException Base class for character conversion exceptions.
class	Console Methods to access the character-based console device, if any, associated with the current Java virtual machine.
class	DataInputStream A data input stream lets an application read primitive Java data types from an underlying input stream in a machine-independent way.
class	DataOutputStream A data output stream lets an application write primitive Java data types to an output stream in a portable way.
class	EOFException Signals that an end of file or end of stream has been reached unexpectedly during input.
class	File An abstract representation of file and directory pathnames.
class	FileDescriptor Instances of the file descriptor class serve as an opaque handle to the underlying machine-specific structure representing an open file, an open socket, or another source or sink of bytes.
class	FileInputStream A FileInputStream obtains input bytes from a file in a file system.
class	FileNotFoundException Signals that an attempt to open the file denoted by a specified pathname has failed.
class	FileOutputStream A file output stream is an output stream for writing data to a File or to a FileDescriptor.
class	FilePermission This class represents access to a file or directory.
class	FileReader Reads text from character files using a default buffer size.
class	FileWriter Writes text to character files using a default buffer size.
class	FilterInputStream A FilterInputStream contains some other input stream, which it uses as its basic source of data, possibly transforming the data along the way or providing additional functionality.
class	FilterOutputStream This class is the superclass of all classes that filter output streams.
abstract class	FilterReader Abstract class for reading filtered character streams.
abstract class	FilterWriter Abstract class for writing filtered character streams.
abstract class	InputStream This abstract class is the superclass of all classes representing an input stream of bytes.
class	InputStreamReader An InputStreamReader is a bridge from byte streams to character streams: It reads bytes and decodes them into characters using a specified charset.
class	InterruptedIOException Signals that an I/O operation has been interrupted.
class	InvalidClassException Thrown when the Serialization runtime detects one of the following problems with a Class.
class	InvalidObjectException Indicates that one or more deserialized objects failed validation tests.
class	IOError Thrown when a serious I/O error has occurred.
class	IOException Signals that an I/O exception of some sort has occurred.
class	LineNumberInputStream Deprecated. This class incorrectly assumes that bytes adequately represent characters.
class	LineNumberReader A buffered character-input stream that keeps track of line numbers.
class	NotActiveException Thrown when serialization or deserialization is not active.
class	NotSerializableException Thrown when an instance is required to have a Serializable interface.
static class	ObjectInputFilter.Config A utility class to set and get the JVM-wide deserialization filter factory, the static JVM-wide filter, or to create a filter from a pattern string.
static enum	ObjectInputFilter.Status The status of a check on the class, array length, number of references, depth, and stream size.
class	ObjectInputStream An ObjectInputStream deserializes primitive data and objects previously written using an ObjectOutputStream.
abstract static class	ObjectInputStream.GetField Provide access to the persistent fields read from the input stream.
class	ObjectOutputStream An ObjectOutputStream writes primitive data types and graphs of Java objects to an OutputStream.
abstract static class	ObjectOutputStream.PutField Provide programmatic access to the persistent fields to be written to ObjectOutput.
class	ObjectStreamClass Serialization's descriptor for classes.
abstract class	ObjectStreamException Superclass of all exceptions specific to Object Stream classes.
class	ObjectStreamField A description of a Serializable field from a Serializable class.
class	OptionalDataException Exception indicating the failure of an object read operation due to unread primitive data, or the end of data belonging to a serialized object in the stream.
abstract class	OutputStream This abstract class is the superclass of all classes representing an output stream of bytes.
class	OutputStreamWriter An OutputStreamWriter is a bridge from character streams to byte streams: Characters written to it are encoded into bytes using a specified charset.
class	PipedInputStream A piped input stream should be connected to a piped output stream; the piped input stream then provides whatever data bytes are written to the piped output stream.
class	PipedOutputStream A piped output stream can be connected to a piped input stream to create a communications pipe.
class	PipedReader Piped character-input streams.
class	PipedWriter Piped character-output streams.
class	PrintStream A PrintStream adds functionality to another output stream, namely the ability to print representations of various data values conveniently.
class	PrintWriter Prints formatted representations of objects to a text-output stream.
class	PushbackInputStream A PushbackInputStream adds functionality to another input stream, namely the ability to "push back" or "unread" bytes, by storing pushed-back bytes in an internal buffer.
class	PushbackReader A character-stream reader that allows characters to be pushed back into the stream.
class	RandomAccessFile Instances of this class support both reading and writing to a random access file.
abstract class	Reader Abstract class for reading character streams.
class	SequenceInputStream A SequenceInputStream represents the logical concatenation of other input streams.
class	SerializablePermission This class is for Serializable permissions.
class	StreamCorruptedException Thrown when control information that was read from an object stream violates internal consistency checks.
class	StreamTokenizer The StreamTokenizer class takes an input stream and parses it into "tokens", allowing the tokens to be read one at a time.
class	StringBufferInputStream Deprecated. This class does not properly convert characters into bytes.
class	StringReader A character stream whose source is a string.
class	StringWriter A character stream that collects its output in a string buffer, which can then be used to construct a string.
class	SyncFailedException Signals that a sync operation has failed.
class	UncheckedIOException Wraps an IOException with an unchecked exception.
class	UnsupportedEncodingException The Character Encoding is not supported.
class	UTFDataFormatException Signals that a malformed string in modified UTF-8 format has been read in a data input stream or by any class that implements the data input interface.
class	WriteAbortedException Signals that one of the ObjectStreamExceptions was thrown during a write operation.
abstract class	Writer Abstract class for writing to character streams.

Class declarations in java.io with type arguments of type Object
class	ObjectStreamField extends Object implements Comparable<Object> A description of a Serializable field from a Serializable class.

Fields in java.io declared as Object
protected Object	Reader.lock The object used to synchronize operations on this stream.
protected Object	Writer.lock The object used to synchronize operations on this stream.

Methods in java.io that return Object
Object	ObjectInput.readObject() Read and return an object.
final Object	ObjectInputStream.readObject() Read an object from the ObjectInputStream.
protected Object	ObjectInputStream.readObjectOverride() This method is called by trusted subclasses of ObjectInputStream that constructed ObjectInputStream using the protected no-arg constructor.
Object	ObjectInputStream.readUnshared() Reads an "unshared" object from the ObjectInputStream.
protected Object	ObjectInputStream.resolveObject(Object obj) This method will allow trusted subclasses of ObjectInputStream to substitute one object for another during deserialization.
abstract Object	ObjectInputStream.GetField.get(String name, Object val) Get the value of the named Object field from the persistent field.
protected Object	ObjectOutputStream.replaceObject(Object obj) This method will allow trusted subclasses of ObjectOutputStream to substitute one object for another during serialization.

Methods in java.io with parameters of type Object
Console	Console.format(String fmt, Object... args) Writes a formatted string to this console's output stream using the specified format string and arguments.
Console	Console.printf(String format, Object... args) A convenience method to write a formatted string to this console's output stream using the specified format string and arguments.
String	Console.readLine(String fmt, Object... args) Provides a formatted prompt, then reads a single line of text from the console.
char[]	Console.readPassword(String fmt, Object... args) Provides a formatted prompt, then reads a password or passphrase from the console with echoing disabled.
boolean	File.equals(Object obj) Tests this abstract pathname for equality with the given object.
boolean	FilePermission.equals(Object obj) Checks two FilePermission objects for equality.
protected Object	ObjectInputStream.resolveObject(Object obj) This method will allow trusted subclasses of ObjectInputStream to substitute one object for another during deserialization.
abstract Object	ObjectInputStream.GetField.get(String name, Object val) Get the value of the named Object field from the persistent field.
void	ObjectOutput.writeObject(Object obj) Write an object to the underlying storage or stream.
protected Object	ObjectOutputStream.replaceObject(Object obj) This method will allow trusted subclasses of ObjectOutputStream to substitute one object for another during serialization.
final void	ObjectOutputStream.writeObject(Object obj) Write the specified object to the ObjectOutputStream.
protected void	ObjectOutputStream.writeObjectOverride(Object obj) Method used by subclasses to override the default writeObject method.
void	ObjectOutputStream.writeUnshared(Object obj) Writes an "unshared" object to the ObjectOutputStream.
abstract void	ObjectOutputStream.PutField.put(String name, Object val) Put the value of the named Object field into the persistent field.
int	ObjectStreamField.compareTo(Object obj) Compare this field with another ObjectStreamField.
PrintStream	PrintStream.format(Locale l, String format, Object... args) Writes a formatted string to this output stream using the specified format string and arguments.
PrintStream	PrintStream.format(String format, Object... args) Writes a formatted string to this output stream using the specified format string and arguments.
void	PrintStream.print(Object obj) Prints an object.
PrintStream	PrintStream.printf(Locale l, String format, Object... args) A convenience method to write a formatted string to this output stream using the specified format string and arguments.
PrintStream	PrintStream.printf(String format, Object... args) A convenience method to write a formatted string to this output stream using the specified format string and arguments.
void	PrintStream.println(Object x) Prints an Object and then terminate the line.
PrintWriter	PrintWriter.format(Locale l, String format, Object... args) Writes a formatted string to this writer using the specified format string and arguments.
PrintWriter	PrintWriter.format(String format, Object... args) Writes a formatted string to this writer using the specified format string and arguments.
void	PrintWriter.print(Object obj) Prints an object.
PrintWriter	PrintWriter.printf(Locale l, String format, Object... args) A convenience method to write a formatted string to this writer using the specified format string and arguments.
PrintWriter	PrintWriter.printf(String format, Object... args) A convenience method to write a formatted string to this writer using the specified format string and arguments.
void	PrintWriter.println(Object x) Prints an Object and then terminates the line.

Constructors in java.io with parameters of type Object
protected	Reader(Object lock) Creates a new character-stream reader whose critical sections will synchronize on the given object.
protected	Writer(Object lock) Creates a new character-stream writer whose critical sections will synchronize on the given object.

Uses of Object in java.lang

Subclasses of Object in java.lang
class	AbstractMethodError Thrown when an application tries to call an abstract method.
class	ArithmeticException Thrown when an exceptional arithmetic condition has occurred.
class	ArrayIndexOutOfBoundsException Thrown to indicate that an array has been accessed with an illegal index.
class	ArrayStoreException Thrown to indicate that an attempt has been made to store the wrong type of object into an array of objects.
class	AssertionError Thrown to indicate that an assertion has failed.
class	Boolean The Boolean class wraps a value of the primitive type boolean in an object.
class	BootstrapMethodError Thrown to indicate that an invokedynamic instruction or a dynamic constant failed to resolve its bootstrap method and arguments, or for invokedynamic instruction the bootstrap method has failed to provide a call site with a target of the correct method type, or for a dynamic constant the bootstrap method has failed to provide a constant value of the required type.
class	Byte The Byte class wraps a value of primitive type byte in an object.
class	Character The Character class wraps a value of the primitive type char in an object.
static class	Character.Subset Instances of this class represent particular subsets of the Unicode character set.
static class	Character.UnicodeBlock A family of character subsets representing the character blocks in the Unicode specification.
static enum	Character.UnicodeScript A family of character subsets representing the character scripts defined in the Unicode Standard Annex #24: Script Names.
class	Class<T> Instances of the class Class represent classes and interfaces in a running Java application.
class	ClassCastException Thrown to indicate that the code has attempted to cast an object to a subclass of which it is not an instance.
class	ClassCircularityError Thrown when the Java Virtual Machine detects a circularity in the superclass hierarchy of a class being loaded.
class	ClassFormatError Thrown when the Java Virtual Machine attempts to read a class file and determines that the file is malformed or otherwise cannot be interpreted as a class file.
abstract class	ClassLoader A class loader is an object that is responsible for loading classes.
class	ClassNotFoundException Thrown when an application tries to load in a class through its string name using: The forName method in class Class.
abstract class	ClassValue<T> Lazily associate a computed value with (potentially) every type.
class	CloneNotSupportedException Thrown to indicate that the clone method in class Object has been called to clone an object, but that the object's class does not implement the Cloneable interface.
class	Compiler Deprecated, for removal. JIT compilers and their technologies vary too widely to be controlled effectively by a standardized interface.
class	Double The Double class wraps a value of the primitive type double in an object.
abstract class	Enum<E extends Enum<E>> This is the common base class of all Java language enumeration classes.
static class	Enum.EnumDesc<E extends Enum<E>> A nominal descriptor for an enum constant.
class	EnumConstantNotPresentException Thrown when an application tries to access an enum constant by name and the enum type contains no constant with the specified name.
class	Error An Error is a subclass of Throwable that indicates serious problems that a reasonable application should not try to catch.
class	Exception The class Exception and its subclasses are a form of Throwable that indicates conditions that a reasonable application might want to catch.
class	ExceptionInInitializerError Signals that an unexpected exception has occurred in a static initializer.
class	Float The Float class wraps a value of primitive type float in an object.
class	IllegalAccessError Thrown if an application attempts to access or modify a field, or to call a method that it does not have access to.
class	IllegalAccessException An IllegalAccessException is thrown when an application tries to reflectively create an instance (other than an array), set or get a field, or invoke a method, but the currently executing method does not have access to the definition of the specified class, field, method or constructor.
class	IllegalArgumentException Thrown to indicate that a method has been passed an illegal or inappropriate argument.
class	IllegalCallerException Thrown to indicate that a method has been called by an inappropriate caller.
class	IllegalMonitorStateException Thrown to indicate that a thread has attempted to wait on an object's monitor or to notify other threads waiting on an object's monitor without owning the specified monitor.
class	IllegalStateException Signals that a method has been invoked at an illegal or inappropriate time.
class	IllegalThreadStateException Thrown to indicate that a thread is not in an appropriate state for the requested operation.
class	IncompatibleClassChangeError Thrown when an incompatible class change has occurred to some class definition.
class	IndexOutOfBoundsException Thrown to indicate that an index of some sort (such as to an array, to a string, or to a vector) is out of range.
class	InheritableThreadLocal<T> This class extends ThreadLocal to provide inheritance of values from parent thread to child thread: when a child thread is created, the child receives initial values for all inheritable thread-local variables for which the parent has values.
class	InstantiationError Thrown when an application tries to use the Java new construct to instantiate an abstract class or an interface.
class	InstantiationException Thrown when an application tries to create an instance of a class using the newInstance method in class Class, but the specified class object cannot be instantiated.
class	Integer The Integer class wraps a value of the primitive type int in an object.
class	InternalError Thrown to indicate some unexpected internal error has occurred in the Java Virtual Machine.
class	InterruptedException Thrown when a thread is waiting, sleeping, or otherwise occupied, and the thread is interrupted, either before or during the activity.
class	LayerInstantiationException Thrown when creating a module layer fails.
class	LinkageError Subclasses of LinkageError indicate that a class has some dependency on another class; however, the latter class has incompatibly changed after the compilation of the former class.
class	Long The Long class wraps a value of the primitive type long in an object.
class	Math The class Math contains methods for performing basic numeric operations such as the elementary exponential, logarithm, square root, and trigonometric functions.
class	Module Represents a run-time module, either named or unnamed.
class	ModuleLayer A layer of modules in the Java virtual machine.
static class	ModuleLayer.Controller Controls a module layer.
class	NegativeArraySizeException Thrown if an application tries to create an array with negative size.
class	NoClassDefFoundError Thrown if the Java Virtual Machine or a ClassLoader instance tries to load in the definition of a class (as part of a normal method call or as part of creating a new instance using the new expression) and no definition of the class could be found.
class	NoSuchFieldError Thrown if an application tries to access or modify a specified field of an object, and that object no longer has that field.
class	NoSuchFieldException Signals that the class doesn't have a field of a specified name.
class	NoSuchMethodError Thrown if an application tries to call a specified method of a class (either static or instance), and that class no longer has a definition of that method.
class	NoSuchMethodException Thrown when a particular method cannot be found.
class	NullPointerException Thrown when an application attempts to use null in a case where an object is required.
abstract class	Number The abstract class Number is the superclass of platform classes representing numeric values that are convertible to the primitive types byte, double, float, int, long, and short.
class	NumberFormatException Thrown to indicate that the application has attempted to convert a string to one of the numeric types, but that the string does not have the appropriate format.
class	OutOfMemoryError Thrown when the Java Virtual Machine cannot allocate an object because it is out of memory, and no more memory could be made available by the garbage collector.
class	Package Represents metadata about a run-time package associated with a class loader.
abstract class	Process Process provides control of native processes started by ProcessBuilder.start and Runtime.exec.
class	ProcessBuilder This class is used to create operating system processes.
abstract static class	ProcessBuilder.Redirect Represents a source of subprocess input or a destination of subprocess output.
static enum	ProcessBuilder.Redirect.Type The type of a Redirect.
abstract class	Record This is the common base class of all Java language record classes.
class	ReflectiveOperationException Common superclass of exceptions thrown by reflective operations in core reflection.
class	Runtime Every Java application has a single instance of class Runtime that allows the application to interface with the environment in which the application is running.
static class	Runtime.Version A representation of a version string for an implementation of the Java SE Platform.
class	RuntimeException RuntimeException is the superclass of those exceptions that can be thrown during the normal operation of the Java Virtual Machine.
class	RuntimePermission This class is for runtime permissions.
class	SecurityException Thrown by the security manager to indicate a security violation.
class	SecurityManager Deprecated, for removal. The Security Manager is deprecated and subject to removal in a future release.
class	Short The Short class wraps a value of primitive type short in an object.
class	StackOverflowError Thrown when a stack overflow occurs because an application recurses too deeply.
class	StackTraceElement An element in a stack trace, as returned by Throwable.getStackTrace().
class	StackWalker A stack walker.
static enum	StackWalker.Option Stack walker option to configure the stack frame information obtained by a StackWalker.
class	StrictMath The class StrictMath contains methods for performing basic numeric operations such as the elementary exponential, logarithm, square root, and trigonometric functions.
class	String The String class represents character strings.
class	StringBuffer A thread-safe, mutable sequence of characters.
class	StringBuilder A mutable sequence of characters.
class	StringIndexOutOfBoundsException Thrown by String methods to indicate that an index is either negative or greater than the size of the string.
class	System The System class contains several useful class fields and methods.
static enum	System.Logger.Level System loggers levels.
abstract static class	System.LoggerFinder The LoggerFinder service is responsible for creating, managing, and configuring loggers to the underlying framework it uses.
class	Thread A thread is a thread of execution in a program.
static enum	Thread.State A thread state.
class	ThreadDeath An instance of ThreadDeath is thrown in the victim thread when the (deprecated) Thread.stop() method is invoked.
class	ThreadGroup A thread group represents a set of threads.
class	ThreadLocal<T> This class provides thread-local variables.
class	Throwable The Throwable class is the superclass of all errors and exceptions in the Java language.
class	TypeNotPresentException Thrown when an application tries to access a type using a string representing the type's name, but no definition for the type with the specified name can be found.
class	UnknownError Thrown when an unknown but serious exception has occurred in the Java Virtual Machine.
class	UnsatisfiedLinkError Thrown if the Java Virtual Machine cannot find an appropriate native-language definition of a method declared native.
class	UnsupportedClassVersionError Thrown when the Java Virtual Machine attempts to read a class file and determines that the major and minor version numbers in the file are not supported.
class	UnsupportedOperationException Thrown to indicate that the requested operation is not supported.
class	VerifyError Thrown when the "verifier" detects that a class file, though well formed, contains some sort of internal inconsistency or security problem.
abstract class	VirtualMachineError Thrown to indicate that the Java Virtual Machine is broken or has run out of resources necessary for it to continue operating.
class	Void The Void class is an uninstantiable placeholder class to hold a reference to the Class object representing the Java keyword void.

Methods in java.lang that return Object
Object[]	Class.getSigners() Gets the signers of this class.
protected Object	ClassLoader.getClassLoadingLock(String className) Returns the lock object for class loading operations.
static Object	Compiler.command(Object any) Examines the argument type and its fields and perform some documented operation.
protected final Object	Enum.clone() Throws CloneNotSupportedException.
protected Object	Object.clone() Creates and returns a copy of this object.
Object	SecurityManager.getSecurityContext() Creates an object that encapsulates the current execution environment.
protected Object	Thread.clone() Throws CloneNotSupportedException as a Thread can not be meaningfully cloned.

Methods in java.lang with parameters of type Object
boolean	Boolean.equals(Object obj) Returns true if and only if the argument is not null and is a Boolean object that represents the same boolean value as this object.
boolean	Byte.equals(Object obj) Compares this object to the specified object.
boolean	Character.equals(Object obj) Compares this object against the specified object.
final boolean	Character.Subset.equals(Object obj) Compares two Subset objects for equality.
T	Class.cast(Object obj) Casts an object to the class or interface represented by this Class object.
boolean	Class.isInstance(Object obj) Determines if the specified Object is assignment-compatible with the object represented by this Class.
protected final void	ClassLoader.setSigners(Class<?> c, Object[] signers) Sets the signers of a class.
static Object	Compiler.command(Object any) Examines the argument type and its fields and perform some documented operation.
boolean	Double.equals(Object obj) Compares this object against the specified object.
final boolean	Enum.equals(Object other) Returns true if the specified object is equal to this enum constant.
boolean	Float.equals(Object obj) Compares this object against the specified object.
boolean	Integer.equals(Object obj) Compares this object to the specified object.
boolean	Long.equals(Object obj) Compares this object to the specified object.
boolean	Object.equals(Object obj) Indicates whether some other object is "equal to" this one.
boolean	ProcessBuilder.Redirect.equals(Object obj) Compares the specified object with this Redirect for equality.
boolean	ProcessHandle.equals(Object other) Returns true if other object is non-null, is of the same implementation, and represents the same system process; otherwise it returns false.
abstract boolean	Record.equals(Object obj) Indicates whether some other object is "equal to" this one.
boolean	Runtime.Version.equals(Object obj) Determines whether this Version is equal to another object.
boolean	Runtime.Version.equalsIgnoreOptional(Object obj) Determines whether this Version is equal to another disregarding optional build information.
void	SecurityManager.checkConnect(String host, int port, Object context) Throws a SecurityException if the specified security context is not allowed to open a socket connection to the specified host and port number.
void	SecurityManager.checkPermission(Permission perm, Object context) Throws a SecurityException if the specified security context is denied access to the resource specified by the given permission.
void	SecurityManager.checkRead(String file, Object context) Throws a SecurityException if the specified security context is not allowed to read the file specified by the string argument.
boolean	Short.equals(Object obj) Compares this object to the specified object.
boolean	StackTraceElement.equals(Object obj) Returns true if the specified object is another StackTraceElement instance representing the same execution point as this instance.
boolean	String.equals(Object anObject) Compares this string to the specified object.
static String	String.format(Locale l, String format, Object... args) Returns a formatted string using the specified locale, format string, and arguments.
static String	String.format(String format, Object... args) Returns a formatted string using the specified format string and arguments.
String	String.formatted(Object... args) Formats using this string as the format string, and the supplied arguments.
static String	String.valueOf(Object obj) Returns the string representation of the Object argument.
StringBuffer	StringBuffer.append(Object obj) Appends the string representation of the Object argument.
StringBuffer	StringBuffer.insert(int offset, Object obj) Inserts the string representation of the Object argument into this character sequence.
StringBuilder	StringBuilder.append(Object obj) Appends the string representation of the Object argument.
StringBuilder	StringBuilder.insert(int offset, Object obj) Inserts the string representation of the Object argument into this character sequence.
static void	System.arraycopy(Object src, int srcPos, Object dest, int destPos, int length) Copies an array from the specified source array, beginning at the specified position, to the specified position of the destination array.
static int	System.identityHashCode(Object x) Returns the same hash code for the given object as would be returned by the default method hashCode(), whether or not the given object's class overrides hashCode().
default void	System.Logger.log(System.Logger.Level level, Object obj) Logs a message produced from the given object.
void	System.Logger.log(System.Logger.Level level, ResourceBundle bundle, String format, Object... params) Logs a message with resource bundle and an optional list of parameters.
default void	System.Logger.log(System.Logger.Level level, String format, Object... params) Logs a message with an optional list of parameters.
static boolean	Thread.holdsLock(Object obj) Returns true if and only if the current thread holds the monitor lock on the specified object.

Constructors in java.lang with parameters of type Object
AssertionError(Object detailMessage) Constructs an AssertionError with its detail message derived from the specified object, which is converted to a string as defined in section {@jls 5.1.11} of The Java Language Specification.

Uses of Object in java.lang.annotation

Subclasses of Object in java.lang.annotation
class	AnnotationFormatError Thrown when the annotation parser attempts to read an annotation from a class file and determines that the annotation is malformed.
class	AnnotationTypeMismatchException Thrown to indicate that a program has attempted to access an element of an annotation whose type has changed after the annotation was compiled (or serialized).
enum	ElementType The constants of this enumerated class provide a simple classification of the syntactic locations where annotations may appear in a Java program.
class	IncompleteAnnotationException Thrown to indicate that a program has attempted to access an element of an annotation interface that was added to the annotation interface definition after the annotation was compiled (or serialized).
enum	RetentionPolicy Annotation retention policy.

Methods in java.lang.annotation with parameters of type Object
boolean	Annotation.equals(Object obj) Returns true if the specified object represents an annotation that is logically equivalent to this one.

Uses of Object in java.util

Subclasses of Object in java.util
abstract class	AbstractCollection<E> This class provides a skeletal implementation of the Collection interface, to minimize the effort required to implement this interface.
abstract class	AbstractList<E> This class provides a skeletal implementation of the List interface to minimize the effort required to implement this interface backed by a "random access" data store (such as an array).
abstract class	AbstractMap<K,V> This class provides a skeletal implementation of the Map interface, to minimize the effort required to implement this interface.
static class	AbstractMap.SimpleEntry<K,V> An Entry maintaining a key and a value.
static class	AbstractMap.SimpleImmutableEntry<K,V> An unmodifiable Entry maintaining a key and a value.
abstract class	AbstractQueue<E> This class provides skeletal implementations of some Queue operations.
abstract class	AbstractSequentialList<E> This class provides a skeletal implementation of the List interface to minimize the effort required to implement this interface backed by a "sequential access" data store (such as a linked list).
abstract class	AbstractSet<E> This class provides a skeletal implementation of the Set interface to minimize the effort required to implement this interface.
class	ArrayDeque<E> Resizable-array implementation of the Deque interface.
class	ArrayList<E> Resizable-array implementation of the List interface.
class	Arrays This class contains various methods for manipulating arrays (such as sorting and searching).
class	Base64 This class consists exclusively of static methods for obtaining encoders and decoders for the Base64 encoding scheme.
static class	Base64.Decoder This class implements a decoder for decoding byte data using the Base64 encoding scheme as specified in RFC 4648 and RFC 2045.
static class	Base64.Encoder This class implements an encoder for encoding byte data using the Base64 encoding scheme as specified in RFC 4648 and RFC 2045.
class	BitSet This class implements a vector of bits that grows as needed.
abstract class	Calendar The Calendar class is an abstract class that provides methods for converting between a specific instant in time and a set of calendar fields such as YEAR, MONTH, DAY_OF_MONTH, HOUR, and so on, and for manipulating the calendar fields, such as getting the date of the next week.
static class	Calendar.Builder Calendar.Builder is used for creating a Calendar from various date-time parameters.
class	Collections This class consists exclusively of static methods that operate on or return collections.
class	ConcurrentModificationException This exception may be thrown by methods that have detected concurrent modification of an object when such modification is not permissible.
class	Currency Represents a currency.
class	Date The class Date represents a specific instant in time, with millisecond precision.
abstract class	Dictionary<K,V> The Dictionary class is the abstract parent of any class, such as Hashtable, which maps keys to values.
class	DoubleSummaryStatistics A state object for collecting statistics such as count, min, max, sum, and average.
class	DuplicateFormatFlagsException Unchecked exception thrown when duplicate flags are provided in the format specifier.
class	EmptyStackException Thrown by methods in the Stack class to indicate that the stack is empty.
class	EnumMap<K extends Enum<K>,V> A specialized Map implementation for use with enum type keys.
abstract class	EnumSet<E extends Enum<E>> A specialized Set implementation for use with enum types.
abstract class	EventListenerProxy<T extends EventListener> An abstract wrapper class for an EventListener class which associates a set of additional parameters with the listener.
class	EventObject The root class from which all event state objects shall be derived.
class	FormatFlagsConversionMismatchException Unchecked exception thrown when a conversion and flag are incompatible.
class	FormattableFlags FormattableFlags are passed to the Formattable.formatTo() method and modify the output format for Formattables.
class	Formatter An interpreter for printf-style format strings.
static enum	Formatter.BigDecimalLayoutForm Enum for BigDecimal formatting.
class	FormatterClosedException Unchecked exception thrown when the formatter has been closed.
class	GregorianCalendar GregorianCalendar is a concrete subclass of Calendar and provides the standard calendar system used by most of the world.
class	HashMap<K,V> Hash table based implementation of the Map interface.
class	HashSet<E> This class implements the Set interface, backed by a hash table (actually a HashMap instance).
class	Hashtable<K,V> This class implements a hash table, which maps keys to values.
class	HexFormat HexFormat converts between bytes and chars and hex-encoded strings which may include additional formatting markup such as prefixes, suffixes, and delimiters.
class	IdentityHashMap<K,V> This class implements the Map interface with a hash table, using reference-equality in place of object-equality when comparing keys (and values).
class	IllegalFormatCodePointException Unchecked exception thrown when a character with an invalid Unicode code point as defined by Character.isValidCodePoint(int) is passed to the Formatter.
class	IllegalFormatConversionException Unchecked exception thrown when the argument corresponding to the format specifier is of an incompatible type.
class	IllegalFormatException Unchecked exception thrown when a format string contains an illegal syntax or a format specifier that is incompatible with the given arguments.
class	IllegalFormatFlagsException Unchecked exception thrown when an illegal combination flags is given.
class	IllegalFormatPrecisionException Unchecked exception thrown when the precision is a negative value other than -1, the conversion does not support a precision, or the value is otherwise unsupported.
class	IllegalFormatWidthException Unchecked exception thrown when the format width is a negative value other than -1 or is otherwise unsupported.
class	IllformedLocaleException Thrown by methods in Locale and Locale.Builder to indicate that an argument is not a well-formed BCP 47 tag.
class	InputMismatchException Thrown by a Scanner to indicate that the token retrieved does not match the pattern for the expected type, or that the token is out of range for the expected type.
class	IntSummaryStatistics A state object for collecting statistics such as count, min, max, sum, and average.
class	InvalidPropertiesFormatException Thrown to indicate that an operation could not complete because the input did not conform to the appropriate XML document type for a collection of properties, as per the Properties specification.
class	LinkedHashMap<K,V> Hash table and linked list implementation of the Map interface, with predictable iteration order.
class	LinkedHashSet<E> Hash table and linked list implementation of the Set interface, with predictable iteration order.
class	LinkedList<E> Doubly-linked list implementation of the List and Deque interfaces.
abstract class	ListResourceBundle ListResourceBundle is an abstract subclass of ResourceBundle that manages resources for a locale in a convenient and easy to use list.
class	Locale A Locale object represents a specific geographical, political, or cultural region.
static class	Locale.Builder Builder is used to build instances of Locale from values configured by the setters.
static enum	Locale.Category Enum for locale categories.
static enum	Locale.FilteringMode This enum provides constants to select a filtering mode for locale matching.
static enum	Locale.IsoCountryCode Enum for specifying the type defined in ISO 3166.
static class	Locale.LanguageRange This class expresses a Language Range defined in RFC 4647 Matching of Language Tags.
class	LongSummaryStatistics A state object for collecting statistics such as count, min, max, sum, and average.
class	MissingFormatArgumentException Unchecked exception thrown when there is a format specifier which does not have a corresponding argument or if an argument index refers to an argument that does not exist.
class	MissingFormatWidthException Unchecked exception thrown when the format width is required.
class	MissingResourceException Signals that a resource is missing.
class	NoSuchElementException Thrown by various accessor methods to indicate that the element being requested does not exist.
class	Objects This class consists of static utility methods for operating on objects, or checking certain conditions before operation.
class	Observable Deprecated. This class and the Observer interface have been deprecated.
class	Optional<T> A container object which may or may not contain a non-null value.
class	OptionalDouble A container object which may or may not contain a double value.
class	OptionalInt A container object which may or may not contain an int value.
class	OptionalLong A container object which may or may not contain a long value.
class	PriorityQueue<E> An unbounded priority queue based on a priority heap.
class	Properties The Properties class represents a persistent set of properties.
class	PropertyPermission This class is for property permissions.
class	PropertyResourceBundle PropertyResourceBundle is a concrete subclass of ResourceBundle that manages resources for a locale using a set of static strings from a property file.
class	Random An instance of this class is used to generate a stream of pseudorandom numbers; its period is only 2⁴⁸.
abstract class	ResourceBundle Resource bundles contain locale-specific objects.
static class	ResourceBundle.Control ResourceBundle.Control defines a set of callback methods that are invoked by the ResourceBundle.getBundle factory methods during the bundle loading process.
class	Scanner A simple text scanner which can parse primitive types and strings using regular expressions.
class	ServiceConfigurationError Error thrown when something goes wrong while locating, loading, or instantiating a service provider.
class	ServiceLoader<S> A facility to load implementations of a service.
class	SimpleTimeZone SimpleTimeZone is a concrete subclass of TimeZone that represents a time zone for use with a Gregorian calendar.
class	Spliterators Static classes and methods for operating on or creating instances of Spliterator and its primitive specializations Spliterator.OfInt, Spliterator.OfLong, and Spliterator.OfDouble.
abstract static class	Spliterators.AbstractDoubleSpliterator An abstract Spliterator.OfDouble that implements trySplit to permit limited parallelism.
abstract static class	Spliterators.AbstractIntSpliterator An abstract Spliterator.OfInt that implements trySplit to permit limited parallelism.
abstract static class	Spliterators.AbstractLongSpliterator An abstract Spliterator.OfLong that implements trySplit to permit limited parallelism.
abstract static class	Spliterators.AbstractSpliterator<T> An abstract Spliterator that implements trySplit to permit limited parallelism.
class	SplittableRandom A generator of uniform pseudorandom values (with period 2⁶⁴) applicable for use in (among other contexts) isolated parallel computations that may generate subtasks.
class	Stack<E> The Stack class represents a last-in-first-out (LIFO) stack of objects.
class	StringJoiner StringJoiner is used to construct a sequence of characters separated by a delimiter and optionally starting with a supplied prefix and ending with a supplied suffix.
class	StringTokenizer The string tokenizer class allows an application to break a string into tokens.
class	Timer A facility for threads to schedule tasks for future execution in a background thread.
abstract class	TimerTask A task that can be scheduled for one-time or repeated execution by a Timer.
abstract class	TimeZone TimeZone represents a time zone offset, and also figures out daylight savings.
class	TooManyListenersException The TooManyListenersException Exception is used as part of the Java Event model to annotate and implement a unicast special case of a multicast Event Source.
class	TreeMap<K,V> A Red-Black tree based NavigableMap implementation.
class	TreeSet<E> A NavigableSet implementation based on a TreeMap.
class	UnknownFormatConversionException Unchecked exception thrown when an unknown conversion is given.
class	UnknownFormatFlagsException Unchecked exception thrown when an unknown flag is given.
class	UUID A class that represents an immutable universally unique identifier (UUID).
class	Vector<E> The Vector class implements a growable array of objects.
class	WeakHashMap<K,V> Hash table based implementation of the Map interface, with weak keys.

Class declarations in java.util with type arguments of type Object
class	Properties extends Hashtable<Object> The Properties class represents a persistent set of properties.
class	StringTokenizer extends Object implements Enumeration<Object> The string tokenizer class allows an application to break a string into tokens.

Fields in java.util declared as Object
protected Object	EventObject.source The object on which the Event initially occurred.
protected Object[]	Vector.elementData The array buffer into which the components of the vector are stored.

Methods in java.util with type parameters of type Object
static <T extends Object & Comparable<? super T>> T	Collections.max(Collection<? extends T> coll) Returns the maximum element of the given collection, according to the natural ordering of its elements.
static <T extends Object & Comparable<? super T>> T	Collections.min(Collection<? extends T> coll) Returns the minimum element of the given collection, according to the natural ordering of its elements.

Methods in java.util that return Object
Object[]	AbstractCollection.toArray() Returns an array containing all of the elements in this collection.
protected Object	AbstractMap.clone() Returns a shallow copy of this AbstractMap instance: the keys and values themselves are not cloned.
Object[]	ArrayDeque.toArray() Returns an array containing all of the elements in this deque in proper sequence (from first to last element).
Object	ArrayList.clone() Returns a shallow copy of this ArrayList instance.
Object[]	ArrayList.toArray() Returns an array containing all of the elements in this list in proper sequence (from first to last element).
Object	BitSet.clone() Cloning this BitSet produces a new BitSet that is equal to it.
Object	Calendar.clone() Creates and returns a copy of this object.
Object[]	Collection.toArray() Returns an array containing all of the elements in this collection.
Object	Date.clone() Return a copy of this object.
Object	EventObject.getSource() The object on which the Event initially occurred.
Object	GregorianCalendar.clone() Creates and returns a copy of this object.
Object	HashMap.clone() Returns a shallow copy of this HashMap instance: the keys and values themselves are not cloned.
Object	HashSet.clone() Returns a shallow copy of this HashSet instance: the elements themselves are not cloned.
Object[]	HashSet.toArray() Returns an array containing all of the elements in this collection.
Object	Hashtable.clone() Creates a shallow copy of this hashtable.
Object	IdentityHashMap.clone() Returns a shallow copy of this identity hash map: the keys and values themselves are not cloned.
Object	LinkedList.clone() Returns a shallow copy of this LinkedList.
Object[]	LinkedList.toArray() Returns an array containing all of the elements in this list in proper sequence (from first to last element).
Object[]	List.toArray() Returns an array containing all of the elements in this list in proper sequence (from first to last element).
protected abstract Object[][]	ListResourceBundle.getContents() Returns an array in which each item is a pair of objects in an Object array.
final Object	ListResourceBundle.handleGetObject(String key) Gets an object for the given key from this resource bundle.
Object	Locale.clone() Overrides Cloneable.
Object[]	PriorityQueue.toArray() Returns an array containing all of the elements in this queue.
Object	Properties.clone() Creates a shallow copy of this hashtable.
Object	Properties.compute(Object key, BiFunction<? super Object,? super Object,?> remappingFunction) Attempts to compute a mapping for the specified key and its current mapped value (or null if there is no current mapping).
Object	Properties.computeIfAbsent(Object key, Function<? super Object,?> mappingFunction) If the specified key is not already associated with a value (or is mapped to null), attempts to compute its value using the given mapping function and enters it into this map unless null.
Object	Properties.computeIfPresent(Object key, BiFunction<? super Object,? super Object,?> remappingFunction) If the value for the specified key is present and non-null, attempts to compute a new mapping given the key and its current mapped value.
Object	Properties.get(Object key) Returns the value to which the specified key is mapped, or null if this map contains no mapping for the key.
Object	Properties.getOrDefault(Object key, Object defaultValue) Returns the value to which the specified key is mapped, or defaultValue if this map contains no mapping for the key.
Object	Properties.merge(Object key, Object value, BiFunction<? super Object,? super Object,?> remappingFunction) If the specified key is not already associated with a value or is associated with null, associates it with the given non-null value.
Object	Properties.put(Object key, Object value) Maps the specified key to the specified value in this hashtable.
Object	Properties.putIfAbsent(Object key, Object value) If the specified key is not already associated with a value (or is mapped to null) associates it with the given value and returns null, else returns the current value.
Object	Properties.remove(Object key) Removes the key (and its corresponding value) from this hashtable.
Object	Properties.replace(Object key, Object value) Replaces the entry for the specified key only if it is currently mapped to some value.
Object	Properties.setProperty(String key, String value) Calls the Hashtable method put.
Object	PropertyResourceBundle.handleGetObject(String key) Gets an object for the given key from this resource bundle.
final Object	ResourceBundle.getObject(String key) Gets an object for the given key from this resource bundle or one of its parents.
protected abstract Object	ResourceBundle.handleGetObject(String key) Gets an object for the given key from this resource bundle.
Object[]	Set.toArray() Returns an array containing all of the elements in this set.
Object	SimpleTimeZone.clone() Returns a clone of this SimpleTimeZone instance.
Object	StringTokenizer.nextElement() Returns the same value as the nextToken method, except that its declared return value is Object rather than String.
Object	TimeZone.clone() Creates a copy of this TimeZone.
Object	TreeMap.clone() Returns a shallow copy of this TreeMap instance.
Object	TreeSet.clone() Returns a shallow copy of this TreeSet instance.
Object	Vector.clone() Returns a clone of this vector.
Object[]	Vector.toArray() Returns an array containing all of the elements in this Vector in the correct order.

Methods in java.util that return types with arguments of type Object
Enumeration<Object>	Properties.elements() Returns an enumeration of the values in this hashtable.
Set<Map.Entry<Object>>	Properties.entrySet() Returns a Set view of the mappings contained in this map.
Enumeration<Object>	Properties.keys() Returns an enumeration of the keys in this hashtable.
Set<Object>	Properties.keySet() Returns a Set view of the keys contained in this map.
Collection<Object>	Properties.values() Returns a Collection view of the values contained in this map.

Methods in java.util with parameters of type Object
boolean	AbstractCollection.contains(Object o) Returns true if this collection contains the specified element.
boolean	AbstractCollection.remove(Object o) Removes a single instance of the specified element from this collection, if it is present (optional operation).
boolean	AbstractList.equals(Object o) Compares the specified object with this list for equality.
int	AbstractList.indexOf(Object o) Returns the index of the first occurrence of the specified element in this list, or -1 if this list does not contain the element.
int	AbstractList.lastIndexOf(Object o) Returns the index of the last occurrence of the specified element in this list, or -1 if this list does not contain the element.
boolean	AbstractMap.containsKey(Object key) Returns true if this map contains a mapping for the specified key.
boolean	AbstractMap.containsValue(Object value) Returns true if this map maps one or more keys to the specified value.
boolean	AbstractMap.equals(Object o) Compares the specified object with this map for equality.
V	AbstractMap.get(Object key) Returns the value to which the specified key is mapped, or null if this map contains no mapping for the key.
V	AbstractMap.remove(Object key) Removes the mapping for a key from this map if it is present (optional operation).
boolean	AbstractMap.SimpleEntry.equals(Object o) Compares the specified object with this entry for equality.
boolean	AbstractMap.SimpleImmutableEntry.equals(Object o) Compares the specified object with this entry for equality.
boolean	AbstractSet.equals(Object o) Compares the specified object with this set for equality.
boolean	ArrayDeque.contains(Object o) Returns true if this deque contains the specified element.
boolean	ArrayDeque.remove(Object o) Removes a single instance of the specified element from this deque.
boolean	ArrayDeque.removeFirstOccurrence(Object o) Removes the first occurrence of the specified element in this deque (when traversing the deque from head to tail).
boolean	ArrayDeque.removeLastOccurrence(Object o) Removes the last occurrence of the specified element in this deque (when traversing the deque from head to tail).
boolean	ArrayList.contains(Object o) Returns true if this list contains the specified element.
boolean	ArrayList.equals(Object o) Compares the specified object with this list for equality.
int	ArrayList.indexOf(Object o) Returns the index of the first occurrence of the specified element in this list, or -1 if this list does not contain the element.
int	ArrayList.lastIndexOf(Object o) Returns the index of the last occurrence of the specified element in this list, or -1 if this list does not contain the element.
boolean	ArrayList.remove(Object o) Removes the first occurrence of the specified element from this list, if it is present.
static int	Arrays.binarySearch(Object[] a, int fromIndex, int toIndex, Object key) Searches a range of the specified array for the specified object using the binary search algorithm.
static int	Arrays.binarySearch(Object[] a, Object key) Searches the specified array for the specified object using the binary search algorithm.
static boolean	Arrays.deepEquals(Object[] a1, Object[] a2) Returns true if the two specified arrays are deeply equal to one another.
static int	Arrays.deepHashCode(Object[] a) Returns a hash code based on the "deep contents" of the specified array.
static String	Arrays.deepToString(Object[] a) Returns a string representation of the "deep contents" of the specified array.
static boolean	Arrays.equals(Object[] a, int aFromIndex, int aToIndex, Object[] b, int bFromIndex, int bToIndex) Returns true if the two specified arrays of Objects, over the specified ranges, are equal to one another.
static boolean	Arrays.equals(Object[] a, Object[] a2) Returns true if the two specified arrays of Objects are equal to one another.
static void	Arrays.fill(Object[] a, int fromIndex, int toIndex, Object val) Assigns the specified Object reference to each element of the specified range of the specified array of Objects.
static void	Arrays.fill(Object[] a, Object val) Assigns the specified Object reference to each element of the specified array of Objects.
static int	Arrays.hashCode(Object[] a) Returns a hash code based on the contents of the specified array.
static int	Arrays.mismatch(Object[] a, int aFromIndex, int aToIndex, Object[] b, int bFromIndex, int bToIndex) Finds and returns the relative index of the first mismatch between two Object arrays over the specified ranges, otherwise return -1 if no mismatch is found.
static int	Arrays.mismatch(Object[] a, Object[] b) Finds and returns the index of the first mismatch between two Object arrays, otherwise return -1 if no mismatch is found.
static void	Arrays.sort(Object[] a) Sorts the specified array of objects into ascending order, according to the natural ordering of its elements.
static void	Arrays.sort(Object[] a, int fromIndex, int toIndex) Sorts the specified range of the specified array of objects into ascending order, according to the natural ordering of its elements.
static String	Arrays.toString(Object[] a) Returns a string representation of the contents of the specified array.
boolean	BitSet.equals(Object obj) Compares this object against the specified object.
boolean	Calendar.after(Object when) Returns whether this Calendar represents a time after the time represented by the specified Object.
boolean	Calendar.before(Object when) Returns whether this Calendar represents a time before the time represented by the specified Object.
boolean	Calendar.equals(Object obj) Compares this Calendar to the specified Object.
boolean	Collection.contains(Object o) Returns true if this collection contains the specified element.
boolean	Collection.equals(Object o) Compares the specified object with this collection for equality.
boolean	Collection.remove(Object o) Removes a single instance of the specified element from this collection, if it is present (optional operation).
static int	Collections.frequency(Collection<?> c, Object o) Returns the number of elements in the specified collection equal to the specified object.
boolean	Comparator.equals(Object obj) Indicates whether some other object is "equal to" this comparator.
boolean	Date.equals(Object obj) Compares two dates for equality.
boolean	Deque.contains(Object o) Returns true if this deque contains the specified element.
boolean	Deque.remove(Object o) Removes the first occurrence of the specified element from this deque.
boolean	Deque.removeFirstOccurrence(Object o) Removes the first occurrence of the specified element from this deque.
boolean	Deque.removeLastOccurrence(Object o) Removes the last occurrence of the specified element from this deque.
abstract V	Dictionary.get(Object key) Returns the value to which the key is mapped in this dictionary.
abstract V	Dictionary.remove(Object key) Removes the key (and its corresponding value) from this dictionary.
boolean	EnumMap.containsKey(Object key) Returns true if this map contains a mapping for the specified key.
boolean	EnumMap.containsValue(Object value) Returns true if this map maps one or more keys to the specified value.
boolean	EnumMap.equals(Object o) Compares the specified object with this map for equality.
V	EnumMap.get(Object key) Returns the value to which the specified key is mapped, or null if this map contains no mapping for the key.
V	EnumMap.remove(Object key) Removes the mapping for this key from this map if present.
Formatter	Formatter.format(Locale l, String format, Object... args) Writes a formatted string to this object's destination using the specified locale, format string, and arguments.
Formatter	Formatter.format(String format, Object... args) Writes a formatted string to this object's destination using the specified format string and arguments.
boolean	GregorianCalendar.equals(Object obj) Compares this GregorianCalendar to the specified Object.
boolean	HashMap.containsKey(Object key) Returns true if this map contains a mapping for the specified key.
boolean	HashMap.containsValue(Object value) Returns true if this map maps one or more keys to the specified value.
V	HashMap.get(Object key) Returns the value to which the specified key is mapped, or null if this map contains no mapping for the key.
V	HashMap.getOrDefault(Object key, V defaultValue) Returns the value to which the specified key is mapped, or defaultValue if this map contains no mapping for the key.
V	HashMap.remove(Object key) Removes the mapping for the specified key from this map if present.
boolean	HashMap.remove(Object key, Object value) Removes the entry for the specified key only if it is currently mapped to the specified value.
boolean	HashSet.contains(Object o) Returns true if this set contains the specified element.
boolean	HashSet.remove(Object o) Removes the specified element from this set if it is present.
boolean	Hashtable.contains(Object value) Tests if some key maps into the specified value in this hashtable.
boolean	Hashtable.containsKey(Object key) Tests if the specified object is a key in this hashtable.
boolean	Hashtable.containsValue(Object value) Returns true if this hashtable maps one or more keys to this value.
boolean	Hashtable.equals(Object o) Compares the specified Object with this Map for equality, as per the definition in the Map interface.
V	Hashtable.get(Object key) Returns the value to which the specified key is mapped, or null if this map contains no mapping for the key.
V	Hashtable.getOrDefault(Object key, V defaultValue) Returns the value to which the specified key is mapped, or defaultValue if this map contains no mapping for the key.
V	Hashtable.remove(Object key) Removes the key (and its corresponding value) from this hashtable.
boolean	Hashtable.remove(Object key, Object value) Removes the entry for the specified key only if it is currently mapped to the specified value.
boolean	HexFormat.equals(Object o) Returns true if the other object is a HexFormat with the same parameters.
boolean	IdentityHashMap.containsKey(Object key) Tests whether the specified object reference is a key in this identity hash map.
boolean	IdentityHashMap.containsValue(Object value) Tests whether the specified object reference is a value in this identity hash map.
boolean	IdentityHashMap.equals(Object o) Compares the specified object with this map for equality.
V	IdentityHashMap.get(Object key) Returns the value to which the specified key is mapped, or null if this map contains no mapping for the key.
V	IdentityHashMap.remove(Object key) Removes the mapping for this key from this map if present.
boolean	LinkedHashMap.containsValue(Object value) Returns true if this map maps one or more keys to the specified value.
V	LinkedHashMap.get(Object key) Returns the value to which the specified key is mapped, or null if this map contains no mapping for the key.
V	LinkedHashMap.getOrDefault(Object key, V defaultValue) Returns the value to which the specified key is mapped, or defaultValue if this map contains no mapping for the key.
boolean	LinkedList.contains(Object o) Returns true if this list contains the specified element.
int	LinkedList.indexOf(Object o) Returns the index of the first occurrence of the specified element in this list, or -1 if this list does not contain the element.
int	LinkedList.lastIndexOf(Object o) Returns the index of the last occurrence of the specified element in this list, or -1 if this list does not contain the element.
boolean	LinkedList.remove(Object o) Removes the first occurrence of the specified element from this list, if it is present.
boolean	LinkedList.removeFirstOccurrence(Object o) Removes the first occurrence of the specified element in this list (when traversing the list from head to tail).
boolean	LinkedList.removeLastOccurrence(Object o) Removes the last occurrence of the specified element in this list (when traversing the list from head to tail).
boolean	List.contains(Object o) Returns true if this list contains the specified element.
boolean	List.equals(Object o) Compares the specified object with this list for equality.
int	List.indexOf(Object o) Returns the index of the first occurrence of the specified element in this list, or -1 if this list does not contain the element.
int	List.lastIndexOf(Object o) Returns the index of the last occurrence of the specified element in this list, or -1 if this list does not contain the element.
boolean	List.remove(Object o) Removes the first occurrence of the specified element from this list, if it is present (optional operation).
boolean	Locale.equals(Object obj) Returns true if this Locale is equal to another object.
boolean	Locale.LanguageRange.equals(Object obj) Compares this object to the specified object.
boolean	Map.containsKey(Object key) Returns true if this map contains a mapping for the specified key.
boolean	Map.containsValue(Object value) Returns true if this map maps one or more keys to the specified value.
boolean	Map.equals(Object o) Compares the specified object with this map for equality.
V	Map.get(Object key) Returns the value to which the specified key is mapped, or null if this map contains no mapping for the key.
default V	Map.getOrDefault(Object key, V defaultValue) Returns the value to which the specified key is mapped, or defaultValue if this map contains no mapping for the key.
V	Map.remove(Object key) Removes the mapping for a key from this map if it is present (optional operation).
default boolean	Map.remove(Object key, Object value) Removes the entry for the specified key only if it is currently mapped to the specified value.
boolean	Map.Entry.equals(Object o) Compares the specified object with this entry for equality.
static boolean	Objects.deepEquals(Object a, Object b) Returns true if the arguments are deeply equal to each other and false otherwise.
static boolean	Objects.equals(Object a, Object b) Returns true if the arguments are equal to each other and false otherwise.
static int	Objects.hash(Object... values) Generates a hash code for a sequence of input values.
static int	Objects.hashCode(Object o) Returns the hash code of a non-null argument and 0 for a null argument.
static boolean	Objects.isNull(Object obj) Returns true if the provided reference is null otherwise returns false.
static boolean	Objects.nonNull(Object obj) Returns true if the provided reference is non-null otherwise returns false.
static String	Objects.toString(Object o) Returns the result of calling toString for a non- null argument and "null" for a null argument.
static String	Objects.toString(Object o, String nullDefault) Returns the result of calling toString on the first argument if the first argument is not null and returns the second argument otherwise.
void	Observable.notifyObservers(Object arg) If this object has changed, as indicated by the hasChanged method, then notify all of its observers and then call the clearChanged method to indicate that this object has no longer changed.
void	Observer.update(Observable o, Object arg) This method is called whenever the observed object is changed.
boolean	Optional.equals(Object obj) Indicates whether some other object is "equal to" this Optional.
boolean	OptionalDouble.equals(Object obj) Indicates whether some other object is "equal to" this OptionalDouble.
boolean	OptionalInt.equals(Object obj) Indicates whether some other object is "equal to" this OptionalInt.
boolean	OptionalLong.equals(Object obj) Indicates whether some other object is "equal to" this OptionalLong.
boolean	PriorityQueue.contains(Object o) Returns true if this queue contains the specified element.
boolean	PriorityQueue.remove(Object o) Removes a single instance of the specified element from this queue, if it is present.
Object	Properties.compute(Object key, BiFunction<? super Object,? super Object,?> remappingFunction) Attempts to compute a mapping for the specified key and its current mapped value (or null if there is no current mapping).
Object	Properties.computeIfAbsent(Object key, Function<? super Object,?> mappingFunction) If the specified key is not already associated with a value (or is mapped to null), attempts to compute its value using the given mapping function and enters it into this map unless null.
Object	Properties.computeIfPresent(Object key, BiFunction<? super Object,? super Object,?> remappingFunction) If the value for the specified key is present and non-null, attempts to compute a new mapping given the key and its current mapped value.
boolean	Properties.contains(Object value) Tests if some key maps into the specified value in this hashtable.
boolean	Properties.containsKey(Object key) Tests if the specified object is a key in this hashtable.
boolean	Properties.containsValue(Object value) Returns true if this hashtable maps one or more keys to this value.
boolean	Properties.equals(Object o) Compares the specified Object with this Map for equality, as per the definition in the Map interface.
Object	Properties.get(Object key) Returns the value to which the specified key is mapped, or null if this map contains no mapping for the key.
Object	Properties.getOrDefault(Object key, Object defaultValue) Returns the value to which the specified key is mapped, or defaultValue if this map contains no mapping for the key.
Object	Properties.merge(Object key, Object value, BiFunction<? super Object,? super Object,?> remappingFunction) If the specified key is not already associated with a value or is associated with null, associates it with the given non-null value.
Object	Properties.put(Object key, Object value) Maps the specified key to the specified value in this hashtable.
Object	Properties.putIfAbsent(Object key, Object value) If the specified key is not already associated with a value (or is mapped to null) associates it with the given value and returns null, else returns the current value.
Object	Properties.remove(Object key) Removes the key (and its corresponding value) from this hashtable.
boolean	Properties.remove(Object key, Object value) Removes the entry for the specified key only if it is currently mapped to the specified value.
boolean	Properties.replace(Object key, Object oldValue, Object newValue) Replaces the entry for the specified key only if currently mapped to the specified value.
Object	Properties.replace(Object key, Object value) Replaces the entry for the specified key only if it is currently mapped to some value.
boolean	PropertyPermission.equals(Object obj) Checks two PropertyPermission objects for equality.
boolean	Set.contains(Object o) Returns true if this set contains the specified element.
boolean	Set.equals(Object o) Compares the specified object with this set for equality.
boolean	Set.remove(Object o) Removes the specified element from this set if it is present (optional operation).
boolean	SimpleTimeZone.equals(Object obj) Compares the equality of two SimpleTimeZone objects.
static <T> Spliterator<T>	Spliterators.spliterator(Object[] array, int additionalCharacteristics) Creates a Spliterator covering the elements of a given array, using a customized set of spliterator characteristics.
static <T> Spliterator<T>	Spliterators.spliterator(Object[] array, int fromIndex, int toIndex, int additionalCharacteristics) Creates a Spliterator covering a range of elements of a given array, using a customized set of spliterator characteristics.
int	Stack.search(Object o) Returns the 1-based position where an object is on this stack.
boolean	TreeMap.containsKey(Object key) Returns true if this map contains a mapping for the specified key.
boolean	TreeMap.containsValue(Object value) Returns true if this map maps one or more keys to the specified value.
V	TreeMap.get(Object key) Returns the value to which the specified key is mapped, or null if this map contains no mapping for the key.
V	TreeMap.remove(Object key) Removes the mapping for this key from this TreeMap if present.
boolean	TreeSet.contains(Object o) Returns true if this set contains the specified element.
boolean	TreeSet.remove(Object o) Removes the specified element from this set if it is present.
boolean	UUID.equals(Object obj) Compares this object to the specified object.
boolean	Vector.contains(Object o) Returns true if this vector contains the specified element.
void	Vector.copyInto(Object[] anArray) Copies the components of this vector into the specified array.
boolean	Vector.equals(Object o) Compares the specified Object with this Vector for equality.
int	Vector.indexOf(Object o) Returns the index of the first occurrence of the specified element in this vector, or -1 if this vector does not contain the element.
int	Vector.indexOf(Object o, int index) Returns the index of the first occurrence of the specified element in this vector, searching forwards from index, or returns -1 if the element is not found.
int	Vector.lastIndexOf(Object o) Returns the index of the last occurrence of the specified element in this vector, or -1 if this vector does not contain the element.
int	Vector.lastIndexOf(Object o, int index) Returns the index of the last occurrence of the specified element in this vector, searching backwards from index, or returns -1 if the element is not found.
boolean	Vector.remove(Object o) Removes the first occurrence of the specified element in this Vector If the Vector does not contain the element, it is unchanged.
boolean	Vector.removeElement(Object obj) Removes the first (lowest-indexed) occurrence of the argument from this vector.
boolean	WeakHashMap.containsKey(Object key) Returns true if this map contains a mapping for the specified key.
boolean	WeakHashMap.containsValue(Object value) Returns true if this map maps one or more keys to the specified value.
V	WeakHashMap.get(Object key) Returns the value to which the specified key is mapped, or null if this map contains no mapping for the key.
V	WeakHashMap.remove(Object key) Removes the mapping for a key from this weak hash map if it is present.

Method parameters in java.util with type arguments of type Object
Object	Properties.compute(Object key, BiFunction<? super Object,? super Object,?> remappingFunction) Attempts to compute a mapping for the specified key and its current mapped value (or null if there is no current mapping).
Object	Properties.computeIfAbsent(Object key, Function<? super Object,?> mappingFunction) If the specified key is not already associated with a value (or is mapped to null), attempts to compute its value using the given mapping function and enters it into this map unless null.
Object	Properties.computeIfPresent(Object key, BiFunction<? super Object,? super Object,?> remappingFunction) If the value for the specified key is present and non-null, attempts to compute a new mapping given the key and its current mapped value.
void	Properties.forEach(BiConsumer<? super Object,? super Object> action) Performs the given action for each entry in this map until all entries have been processed or the action throws an exception.
Object	Properties.merge(Object key, Object value, BiFunction<? super Object,? super Object,?> remappingFunction) If the specified key is not already associated with a value or is associated with null, associates it with the given non-null value.
void	Properties.replaceAll(BiFunction<? super Object,? super Object,?> function) Replaces each entry's value with the result of invoking the given function on that entry until all entries have been processed or the function throws an exception.

Constructors in java.util with parameters of type Object
EventObject(Object source) Constructs a prototypical Event.

Uses of Object in java.util.concurrent

Subclasses of Object in java.util.concurrent
abstract class	AbstractExecutorService Provides default implementations of ExecutorService execution methods.
class	ArrayBlockingQueue<E> A bounded blocking queue backed by an array.
class	BrokenBarrierException Exception thrown when a thread tries to wait upon a barrier that is in a broken state, or which enters the broken state while the thread is waiting.
class	CancellationException Exception indicating that the result of a value-producing task, such as a FutureTask, cannot be retrieved because the task was cancelled.
class	CompletableFuture<T> A Future that may be explicitly completed (setting its value and status), and may be used as a CompletionStage, supporting dependent functions and actions that trigger upon its completion.
class	CompletionException Exception thrown when an error or other exception is encountered in the course of completing a result or task.
class	ConcurrentHashMap<K,V> A hash table supporting full concurrency of retrievals and high expected concurrency for updates.
static class	ConcurrentHashMap.KeySetView<K,V> A view of a ConcurrentHashMap as a Set of keys, in which additions may optionally be enabled by mapping to a common value.
class	ConcurrentLinkedDeque<E> An unbounded concurrent deque based on linked nodes.
class	ConcurrentLinkedQueue<E> An unbounded thread-safe queue based on linked nodes.
class	ConcurrentSkipListMap<K,V> A scalable concurrent ConcurrentNavigableMap implementation.
class	ConcurrentSkipListSet<E> A scalable concurrent NavigableSet implementation based on a ConcurrentSkipListMap.
class	CopyOnWriteArrayList<E> A thread-safe variant of ArrayList in which all mutative operations (add, set, and so on) are implemented by making a fresh copy of the underlying array.
class	CopyOnWriteArraySet<E> A Set that uses an internal CopyOnWriteArrayList for all of its operations.
class	CountDownLatch A synchronization aid that allows one or more threads to wait until a set of operations being performed in other threads completes.
abstract class	CountedCompleter<T> A ForkJoinTask with a completion action performed when triggered and there are no remaining pending actions.
class	CyclicBarrier A synchronization aid that allows a set of threads to all wait for each other to reach a common barrier point.
class	DelayQueue<E extends Delayed> An unbounded blocking queue of Delayed elements, in which an element can only be taken when its delay has expired.
class	Exchanger<V> A synchronization point at which threads can pair and swap elements within pairs.
class	ExecutionException Exception thrown when attempting to retrieve the result of a task that aborted by throwing an exception.
class	ExecutorCompletionService<V> A CompletionService that uses a supplied Executor to execute tasks.
class	Executors Factory and utility methods for Executor, ExecutorService, ScheduledExecutorService, ThreadFactory, and Callable classes defined in this package.
class	Flow Interrelated interfaces and static methods for establishing flow-controlled components in which Publishers produce items consumed by one or more Subscribers, each managed by a Subscription.
class	ForkJoinPool An ExecutorService for running ForkJoinTasks.
abstract class	ForkJoinTask<V> Abstract base class for tasks that run within a ForkJoinPool.
class	ForkJoinWorkerThread A thread managed by a ForkJoinPool, which executes ForkJoinTasks.
class	FutureTask<V> A cancellable asynchronous computation.
class	LinkedBlockingDeque<E> An optionally-bounded blocking deque based on linked nodes.
class	LinkedBlockingQueue<E> An optionally-bounded blocking queue based on linked nodes.
class	LinkedTransferQueue<E> An unbounded TransferQueue based on linked nodes.
class	Phaser A reusable synchronization barrier, similar in functionality to CyclicBarrier and CountDownLatch but supporting more flexible usage.
class	PriorityBlockingQueue<E> An unbounded blocking queue that uses the same ordering rules as class PriorityQueue and supplies blocking retrieval operations.
abstract class	RecursiveAction A recursive resultless ForkJoinTask.
abstract class	RecursiveTask<V> A recursive result-bearing ForkJoinTask.
class	RejectedExecutionException Exception thrown by an Executor when a task cannot be accepted for execution.
class	ScheduledThreadPoolExecutor A ThreadPoolExecutor that can additionally schedule commands to run after a given delay, or to execute periodically.
class	Semaphore A counting semaphore.
class	SubmissionPublisher<T> A Flow.Publisher that asynchronously issues submitted (non-null) items to current subscribers until it is closed.
class	SynchronousQueue<E> A blocking queue in which each insert operation must wait for a corresponding remove operation by another thread, and vice versa.
class	ThreadLocalRandom A random number generator (with period 2⁶⁴) isolated to the current thread.
class	ThreadPoolExecutor An ExecutorService that executes each submitted task using one of possibly several pooled threads, normally configured using Executors factory methods.
static class	ThreadPoolExecutor.AbortPolicy A handler for rejected tasks that throws a RejectedExecutionException.
static class	ThreadPoolExecutor.CallerRunsPolicy A handler for rejected tasks that runs the rejected task directly in the calling thread of the execute method, unless the executor has been shut down, in which case the task is discarded.
static class	ThreadPoolExecutor.DiscardOldestPolicy A handler for rejected tasks that discards the oldest unhandled request and then retries execute, unless the executor is shut down, in which case the task is discarded.
static class	ThreadPoolExecutor.DiscardPolicy A handler for rejected tasks that silently discards the rejected task.
class	TimeoutException Exception thrown when a blocking operation times out.
enum	TimeUnit A TimeUnit represents time durations at a given unit of granularity and provides utility methods to convert across units, and to perform timing and delay operations in these units.

Methods in java.util.concurrent that return Object
Object[]	ArrayBlockingQueue.toArray() Returns an array containing all of the elements in this queue, in proper sequence.
final Object[]	ConcurrentHashMap.KeySetView.toArray() Returns an array containing all of the elements in this collection.
Object[]	ConcurrentLinkedDeque.toArray() Returns an array containing all of the elements in this deque, in proper sequence (from first to last element).
Object[]	ConcurrentLinkedQueue.toArray() Returns an array containing all of the elements in this queue, in proper sequence.
Object	CopyOnWriteArrayList.clone() Returns a shallow copy of this list.
Object[]	CopyOnWriteArrayList.toArray() Returns an array containing all of the elements in this list in proper sequence (from first to last element).
Object[]	CopyOnWriteArraySet.toArray() Returns an array containing all of the elements in this set.
Object[]	DelayQueue.toArray() Returns an array containing all of the elements in this queue.
Object[]	LinkedBlockingDeque.toArray() Returns an array containing all of the elements in this deque, in proper sequence (from first to last element).
Object[]	LinkedBlockingQueue.toArray() Returns an array containing all of the elements in this queue, in proper sequence.
Object[]	LinkedTransferQueue.toArray() Returns an array containing all of the elements in this queue, in proper sequence.
Object[]	PriorityBlockingQueue.toArray() Returns an array containing all of the elements in this queue.
Object[]	SynchronousQueue.toArray() Returns a zero-length array.

Methods in java.util.concurrent that return types with arguments of type Object
static CompletableFuture<Object>	CompletableFuture.anyOf(CompletableFuture<?>... cfs) Returns a new CompletableFuture that is completed when any of the given CompletableFutures complete, with the same result.
static Callable<Object>	Executors.callable(PrivilegedAction<?> action) Returns a Callable object that, when called, runs the given privileged action and returns its result.
static Callable<Object>	Executors.callable(PrivilegedExceptionAction<?> action) Returns a Callable object that, when called, runs the given privileged exception action and returns its result.
static Callable<Object>	Executors.callable(Runnable task) Returns a Callable object that, when called, runs the given task and returns null.

Methods in java.util.concurrent with parameters of type Object
boolean	ArrayBlockingQueue.contains(Object o) Returns true if this queue contains the specified element.
boolean	ArrayBlockingQueue.remove(Object o) Removes a single instance of the specified element from this queue, if it is present.
boolean	BlockingDeque.contains(Object o) Returns true if this deque contains the specified element.
boolean	BlockingDeque.remove(Object o) Removes the first occurrence of the specified element from this deque.
boolean	BlockingDeque.removeFirstOccurrence(Object o) Removes the first occurrence of the specified element from this deque.
boolean	BlockingDeque.removeLastOccurrence(Object o) Removes the last occurrence of the specified element from this deque.
boolean	BlockingQueue.contains(Object o) Returns true if this queue contains the specified element.
boolean	BlockingQueue.remove(Object o) Removes a single instance of the specified element from this queue, if it is present.
boolean	ConcurrentHashMap.contains(Object value) Tests if some key maps into the specified value in this table.
boolean	ConcurrentHashMap.containsKey(Object key) Tests if the specified object is a key in this table.
boolean	ConcurrentHashMap.containsValue(Object value) Returns true if this map maps one or more keys to the specified value.
boolean	ConcurrentHashMap.equals(Object o) Compares the specified object with this map for equality.
V	ConcurrentHashMap.get(Object key) Returns the value to which the specified key is mapped, or null if this map contains no mapping for the key.
V	ConcurrentHashMap.getOrDefault(Object key, V defaultValue) Returns the value to which the specified key is mapped, or the given default value if this map contains no mapping for the key.
V	ConcurrentHashMap.remove(Object key) Removes the key (and its corresponding value) from this map.
boolean	ConcurrentHashMap.remove(Object key, Object value) Removes the entry for the specified key only if it is currently mapped to the specified value.
boolean	ConcurrentHashMap.KeySetView.contains(Object o) Returns true if this collection contains the specified element.
boolean	ConcurrentHashMap.KeySetView.equals(Object o) Indicates whether some other object is "equal to" this one.
boolean	ConcurrentHashMap.KeySetView.remove(Object o) Removes the key from this map view, by removing the key (and its corresponding value) from the backing map.
boolean	ConcurrentLinkedDeque.contains(Object o) Returns true if this deque contains the specified element.
boolean	ConcurrentLinkedDeque.remove(Object o) Removes the first occurrence of the specified element from this deque.
boolean	ConcurrentLinkedDeque.removeFirstOccurrence(Object o) Removes the first occurrence of the specified element from this deque.
boolean	ConcurrentLinkedDeque.removeLastOccurrence(Object o) Removes the last occurrence of the specified element from this deque.
boolean	ConcurrentLinkedQueue.contains(Object o) Returns true if this queue contains the specified element.
boolean	ConcurrentLinkedQueue.remove(Object o) Removes a single instance of the specified element from this queue, if it is present.
default V	ConcurrentMap.getOrDefault(Object key, V defaultValue) Returns the value to which the specified key is mapped, or defaultValue if this map contains no mapping for the key.
boolean	ConcurrentMap.remove(Object key, Object value) Removes the entry for a key only if currently mapped to a given value.
boolean	ConcurrentSkipListMap.containsKey(Object key) Returns true if this map contains a mapping for the specified key.
boolean	ConcurrentSkipListMap.containsValue(Object value) Returns true if this map maps one or more keys to the specified value.
boolean	ConcurrentSkipListMap.equals(Object o) Compares the specified object with this map for equality.
V	ConcurrentSkipListMap.get(Object key) Returns the value to which the specified key is mapped, or null if this map contains no mapping for the key.
V	ConcurrentSkipListMap.getOrDefault(Object key, V defaultValue) Returns the value to which the specified key is mapped, or the given defaultValue if this map contains no mapping for the key.
V	ConcurrentSkipListMap.remove(Object key) Removes the mapping for the specified key from this map if present.
boolean	ConcurrentSkipListMap.remove(Object key, Object value) Removes the entry for the specified key only if it is currently mapped to the specified value.
boolean	ConcurrentSkipListSet.contains(Object o) Returns true if this set contains the specified element.
boolean	ConcurrentSkipListSet.equals(Object o) Compares the specified object with this set for equality.
boolean	ConcurrentSkipListSet.remove(Object o) Removes the specified element from this set if it is present.
boolean	CopyOnWriteArrayList.contains(Object o) Returns true if this list contains the specified element.
boolean	CopyOnWriteArrayList.equals(Object o) Compares the specified object with this list for equality.
int	CopyOnWriteArrayList.indexOf(Object o) Returns the index of the first occurrence of the specified element in this list, or -1 if this list does not contain the element.
int	CopyOnWriteArrayList.lastIndexOf(Object o) Returns the index of the last occurrence of the specified element in this list, or -1 if this list does not contain the element.
boolean	CopyOnWriteArrayList.remove(Object o) Removes the first occurrence of the specified element from this list, if it is present.
boolean	CopyOnWriteArraySet.contains(Object o) Returns true if this set contains the specified element.
boolean	CopyOnWriteArraySet.equals(Object o) Compares the specified object with this set for equality.
boolean	CopyOnWriteArraySet.remove(Object o) Removes the specified element from this set if it is present.
boolean	DelayQueue.remove(Object o) Removes a single instance of the specified element from this queue, if it is present, whether or not it has expired.
boolean	LinkedBlockingDeque.contains(Object o) Returns true if this deque contains the specified element.
boolean	LinkedBlockingDeque.remove(Object o) Removes the first occurrence of the specified element from this deque.
boolean	LinkedBlockingDeque.removeFirstOccurrence(Object o) Removes the first occurrence of the specified element from this deque.
boolean	LinkedBlockingDeque.removeLastOccurrence(Object o) Removes the last occurrence of the specified element from this deque.
boolean	LinkedBlockingQueue.contains(Object o) Returns true if this queue contains the specified element.
boolean	LinkedBlockingQueue.remove(Object o) Removes a single instance of the specified element from this queue, if it is present.
boolean	LinkedTransferQueue.contains(Object o) Returns true if this queue contains the specified element.
boolean	LinkedTransferQueue.remove(Object o) Removes a single instance of the specified element from this queue, if it is present.
boolean	PriorityBlockingQueue.contains(Object o) Returns true if this queue contains the specified element.
boolean	PriorityBlockingQueue.remove(Object o) Removes a single instance of the specified element from this queue, if it is present.
boolean	SynchronousQueue.contains(Object o) Always returns false.
boolean	SynchronousQueue.remove(Object o) Always returns false.
void	TimeUnit.timedWait(Object obj, long timeout) Performs a timed Object.wait using this time unit.

Uses of Object in javax.swing

Subclasses of Object in javax.swing
class	GroupLayout GroupLayout is a LayoutManager that hierarchically groups components in order to position them in a Container.
static enum	GroupLayout.Alignment Enumeration of the possible ways ParallelGroup can align its children.
abstract class	GroupLayout.Group Group provides the basis for the two types of operations supported by GroupLayout: laying out components one after another (SequentialGroup) or aligned (ParallelGroup).
class	GroupLayout.ParallelGroup A Group that aligns and sizes its children.
class	GroupLayout.SequentialGroup A Group that positions and sizes its elements sequentially, one after another.
class	JOptionPane `JOptionPane` makes it easy to pop up a standard dialog box that prompts users for a value or informs them of something.
protected class	JOptionPane.AccessibleJOptionPane This class implements accessibility support for the `JOptionPane` class.

Fields in javax.swing declared as Object
protected Object	JOptionPane.initialSelectionValue Initial value to select in `selectionValues`.
protected Object	JOptionPane.initialValue Value that should be initially selected in `options`.
protected Object	JOptionPane.inputValue Value the user has input.
protected Object	JOptionPane.message Message to display.
protected Object[]	JOptionPane.options Options to display to the user.
protected Object[]	JOptionPane.selectionValues Array of values the user can choose from.
static final Object	JOptionPane.UNINITIALIZED_VALUE Indicates that the user has not yet selected a value.
protected Object	JOptionPane.value Currently selected value, will be a valid option, or `UNINITIALIZED_VALUE` or `null`.

Methods in javax.swing that return Object
Object	JOptionPane.getInitialSelectionValue() Returns the input value that is displayed as initially selected to the user.
Object	JOptionPane.getInitialValue() Returns the initial value.
Object	JOptionPane.getInputValue() Returns the value the user has input, if `wantsInput` is true.
Object	JOptionPane.getMessage() Returns the message-object this pane displays.
Object[]	JOptionPane.getOptions() Returns the choices the user can make.
Object[]	JOptionPane.getSelectionValues() Returns the input selection values.
Object	JOptionPane.getValue() Returns the value the user has selected.
static Object	JOptionPane.showInputDialog(Component parentComponent, Object message, String title, int messageType, Icon icon, Object[] selectionValues, Object initialSelectionValue) Prompts the user for input in a blocking dialog where the initial selection, possible selections, and all other options can be specified.
static Object	JOptionPane.showInternalInputDialog(Component parentComponent, Object message, String title, int messageType, Icon icon, Object[] selectionValues, Object initialSelectionValue) Prompts the user for input in a blocking internal dialog where the initial selection, possible selections, and all other options can be specified.

Methods in javax.swing with parameters of type Object
void	GroupLayout.addLayoutComponent(Component component, Object constraints) Notification that a Component has been added to the parent container.
void	JOptionPane.setInitialSelectionValue(Object newValue) Sets the input value that is initially displayed as selected to the user.
void	JOptionPane.setInitialValue(Object newInitialValue) Sets the initial value that is to be enabled -- the `Component` that has the focus when the pane is initially displayed.
void	JOptionPane.setInputValue(Object newValue) Sets the input value that was selected or input by the user.
void	JOptionPane.setMessage(Object newMessage) Sets the option pane's message-object.
void	JOptionPane.setOptions(Object[] newOptions) Sets the options this pane displays.
void	JOptionPane.setSelectionValues(Object[] newValues) Sets the input selection values for a pane that provides the user with a list of items to choose from.
void	JOptionPane.setValue(Object newValue) Sets the value the user has chosen.
static int	JOptionPane.showConfirmDialog(Component parentComponent, Object message) Brings up a dialog with the options Yes, No and Cancel; with the title, Select an Option.
static int	JOptionPane.showConfirmDialog(Component parentComponent, Object message, String title, int optionType) Brings up a dialog where the number of choices is determined by the `optionType` parameter.
static int	JOptionPane.showConfirmDialog(Component parentComponent, Object message, String title, int optionType, int messageType) Brings up a dialog where the number of choices is determined by the `optionType` parameter, where the `messageType` parameter determines the icon to display.
static int	JOptionPane.showConfirmDialog(Component parentComponent, Object message, String title, int optionType, int messageType, Icon icon) Brings up a dialog with a specified icon, where the number of choices is determined by the `optionType` parameter.
static String	JOptionPane.showInputDialog(Component parentComponent, Object message) Shows a question-message dialog requesting input from the user parented to `parentComponent`.
static String	JOptionPane.showInputDialog(Component parentComponent, Object message, Object initialSelectionValue) Shows a question-message dialog requesting input from the user and parented to `parentComponent`.
static String	JOptionPane.showInputDialog(Component parentComponent, Object message, String title, int messageType) Shows a dialog requesting input from the user parented to `parentComponent` with the dialog having the title `title` and message type `messageType`.
static Object	JOptionPane.showInputDialog(Component parentComponent, Object message, String title, int messageType, Icon icon, Object[] selectionValues, Object initialSelectionValue) Prompts the user for input in a blocking dialog where the initial selection, possible selections, and all other options can be specified.
static String	JOptionPane.showInputDialog(Object message) Shows a question-message dialog requesting input from the user.
static String	JOptionPane.showInputDialog(Object message, Object initialSelectionValue) Shows a question-message dialog requesting input from the user, with the input value initialized to `initialSelectionValue`.
static int	JOptionPane.showInternalConfirmDialog(Component parentComponent, Object message) Brings up an internal dialog panel with the options Yes, No and Cancel; with the title, Select an Option.
static int	JOptionPane.showInternalConfirmDialog(Component parentComponent, Object message, String title, int optionType) Brings up a internal dialog panel where the number of choices is determined by the `optionType` parameter.
static int	JOptionPane.showInternalConfirmDialog(Component parentComponent, Object message, String title, int optionType, int messageType) Brings up an internal dialog panel where the number of choices is determined by the `optionType` parameter, where the `messageType` parameter determines the icon to display.
static int	JOptionPane.showInternalConfirmDialog(Component parentComponent, Object message, String title, int optionType, int messageType, Icon icon) Brings up an internal dialog panel with a specified icon, where the number of choices is determined by the `optionType` parameter.
static String	JOptionPane.showInternalInputDialog(Component parentComponent, Object message) Shows an internal question-message dialog requesting input from the user parented to `parentComponent`.
static String	JOptionPane.showInternalInputDialog(Component parentComponent, Object message, String title, int messageType) Shows an internal dialog requesting input from the user parented to `parentComponent` with the dialog having the title `title` and message type `messageType`.
static Object	JOptionPane.showInternalInputDialog(Component parentComponent, Object message, String title, int messageType, Icon icon, Object[] selectionValues, Object initialSelectionValue) Prompts the user for input in a blocking internal dialog where the initial selection, possible selections, and all other options can be specified.
static void	JOptionPane.showInternalMessageDialog(Component parentComponent, Object message) Brings up an internal confirmation dialog panel.
static void	JOptionPane.showInternalMessageDialog(Component parentComponent, Object message, String title, int messageType) Brings up an internal dialog panel that displays a message using a default icon determined by the `messageType` parameter.
static void	JOptionPane.showInternalMessageDialog(Component parentComponent, Object message, String title, int messageType, Icon icon) Brings up an internal dialog panel displaying a message, specifying all parameters.
static int	JOptionPane.showInternalOptionDialog(Component parentComponent, Object message, String title, int optionType, int messageType, Icon icon, Object[] options, Object initialValue) Brings up an internal dialog panel with a specified icon, where the initial choice is determined by the `initialValue` parameter and the number of choices is determined by the `optionType` parameter.
static void	JOptionPane.showMessageDialog(Component parentComponent, Object message) Brings up an information-message dialog titled "Message".
static void	JOptionPane.showMessageDialog(Component parentComponent, Object message, String title, int messageType) Brings up a dialog that displays a message using a default icon determined by the `messageType` parameter.
static void	JOptionPane.showMessageDialog(Component parentComponent, Object message, String title, int messageType, Icon icon) Brings up a dialog displaying a message, specifying all parameters.
static int	JOptionPane.showOptionDialog(Component parentComponent, Object message, String title, int optionType, int messageType, Icon icon, Object[] options, Object initialValue) Brings up a dialog with a specified icon, where the initial choice is determined by the `initialValue` parameter and the number of choices is determined by the `optionType` parameter.

Constructors in javax.swing with parameters of type Object
JOptionPane(Object message) Creates a instance of `JOptionPane` to display a message using the plain-message message type and the default options delivered by the UI.
JOptionPane(Object message, int messageType) Creates an instance of `JOptionPane` to display a message with the specified message type and the default options,
JOptionPane(Object message, int messageType, int optionType) Creates an instance of `JOptionPane` to display a message with the specified message type and options.
JOptionPane(Object message, int messageType, int optionType, Icon icon) Creates an instance of `JOptionPane` to display a message with the specified message type, options, and icon.
JOptionPane(Object message, int messageType, int optionType, Icon icon, Object[] options) Creates an instance of `JOptionPane` to display a message with the specified message type, icon, and options.
JOptionPane(Object message, int messageType, int optionType, Icon icon, Object[] options, Object initialValue) Creates an instance of `JOptionPane` to display a message with the specified message type, icon, and options, with the initially-selected option specified.

Uses of Object in javax.swing.text

Subclasses of Object in javax.swing.text
abstract class	JTextComponent `JTextComponent` is the base class for swing text components.
class	JTextComponent.AccessibleJTextComponent This class implements accessibility support for the `JTextComponent` class.
static class	JTextComponent.DropLocation Represents a drop location for `JTextComponent`s.
static class	JTextComponent.KeyBinding Binding record for creating key bindings.

Methods in javax.swing.text that return Object
Object	Document.getProperty(Object key) Gets the properties associated with the document.

Methods in javax.swing.text with parameters of type Object
Object	Document.getProperty(Object key) Gets the properties associated with the document.
void	Document.putProperty(Object key, Object value) Associates a property with the document.
void	JTextComponent.read(Reader in, Object desc) Initializes from a stream.

Uses of Object in javax.swing.text.html

Subclasses of Object in javax.swing.text.html
class	HTMLDocument A document that models HTML.
class	HTMLDocument.BlockElement An element that represents a structural block of HTML.
class	HTMLDocument.HTMLReader An HTML reader to load an HTML document with an HTML element structure.
class	HTMLDocument.HTMLReader.BlockAction Action assigned by default to handle the Block task of the reader.
class	HTMLDocument.HTMLReader.CharacterAction Action assigned by default to handle the Character task of the reader.
class	HTMLDocument.HTMLReader.FormAction Action to support forms by building all of the elements used to represent form controls.
class	HTMLDocument.HTMLReader.HiddenAction Action assigned by default to handle the Hidden task of the reader.
class	HTMLDocument.HTMLReader.IsindexAction Action assigned by default to handle the Isindex task of the reader.
class	HTMLDocument.HTMLReader.ParagraphAction Action assigned by default to handle the Paragraph task of the reader.
class	HTMLDocument.HTMLReader.PreAction Action assigned by default to handle the Pre block task of the reader.
class	HTMLDocument.HTMLReader.SpecialAction Action assigned by default to handle the Special task of the reader.
class	HTMLDocument.HTMLReader.TagAction An action to be performed in response to parsing a tag.
abstract static class	HTMLDocument.Iterator An iterator to iterate over a particular type of tag.
class	HTMLDocument.RunElement An element that represents a chunk of text that has a set of HTML character level attributes assigned to it.

Methods in javax.swing.text.html with parameters of type Object
Element	HTMLDocument.getElement(Element e, Object attribute, Object value) Returns the child element of `e` that contains the attribute, `attribute` with value `value`, or `null` if one isn't found.

Uses of Object in javax.swing.undo

Subclasses of Object in javax.swing.undo
class	AbstractUndoableEdit An abstract implementation of `UndoableEdit`, implementing simple responses to all boolean methods in that interface.
class	CannotRedoException Thrown when an UndoableEdit is told to `redo()` and can't.
class	CannotUndoException Thrown when an UndoableEdit is told to `undo()` and can't.
class	CompoundEdit A concrete subclass of AbstractUndoableEdit, used to assemble little UndoableEdits into great big ones.
class	StateEdit StateEdit is a general edit for objects that change state.
class	UndoableEditSupport A support class used for managing `UndoableEdit` listeners.
class	UndoManager UndoManager manages a list of UndoableEdits, providing a way to undo or redo the appropriate edits.

Fields in javax.swing.undo declared as Object
protected Object	UndoableEditSupport.realSource The real source.

Fields in javax.swing.undo with type arguments of type Object
protected Hashtable<Object>	StateEdit.postState The state information after the edit
protected Hashtable<Object>	StateEdit.preState The state information prior to the edit

Method parameters in javax.swing.undo with type arguments of type Object
void	StateEditable.storeState(Hashtable<Object> state) Upon receiving this message the receiver should place any relevant state into state.

Constructors in javax.swing.undo with parameters of type Object
UndoableEditSupport(Object r) Constructs an `UndoableEditSupport` object.

Uses of Object in javax.xml.catalog

Subclasses of Object in javax.xml.catalog
class	CatalogException The exception class handles errors that may happen while processing or using a catalog.
class	CatalogFeatures The CatalogFeatures holds a collection of features and properties.
static class	CatalogFeatures.Builder The Builder class for building the CatalogFeatures object.
static enum	CatalogFeatures.Feature A Feature type as defined in the Catalog Features table.
class	CatalogManager The Catalog Manager manages the creation of XML Catalogs and Catalog Resolvers.

Uses of Object in jdk.javadoc.doclet

Subclasses of Object in jdk.javadoc.doclet
static enum	Doclet.Option.Kind The kind of an option.
static enum	DocletEnvironment.ModuleMode The mode specifying the level of detail of module documentation.
class	StandardDoclet This doclet generates HTML-formatted documentation for the specified modules, packages and types.
static enum	Taglet.Location The kind of location in which a tag may be used.

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