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FlexDoc/Javadoc 2.0 Demo Java Doc |
In addition, this class provides several methods for converting a long to a String and a String to a long, as well as other constants and methods useful when dealing with a long.
This is a value-based class; programmers should treat instances that are equal as interchangeable and should not use instances for synchronization, or unpredictable behavior may occur. For example, in a future release, synchronization may fail.
Implementation note: The implementations of the "bit twiddling" methods (such as highestOneBit and numberOfTrailingZeros) are based on material from Henry S. Warren, Jr.'s Hacker's Delight, (Addison Wesley, 2002).
Field Summary |
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static final int |
The number of bytes used to represent a long value in two's
complement binary form.
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static final long |
A constant holding the maximum value a long can
have, 263-1.
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static final long |
A constant holding the minimum value a long can
have, -263.
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static final int |
The number of bits used to represent a long value in two's
complement binary form.
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The Class instance representing the primitive type
long.
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Constructor Summary |
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Long(long value)
Deprecated, for removal. It is rarely appropriate to use this constructor.
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Deprecated, for removal. It is rarely appropriate to use this constructor.
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Method Summary |
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static int |
bitCount(long i)
Returns the number of one-bits in the two's complement binary
representation of the specified long value.
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byte |
Returns the value of this Long as a byte after
a narrowing primitive conversion.
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static int |
compare(long x, long y)
Compares two long values numerically.
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int |
Compares two Long objects numerically.
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static int |
compareUnsigned(long x, long y)
Compares two long values numerically treating the values
as unsigned.
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static Long |
Decodes a String into a Long.
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Returns an Optional containing the nominal descriptor for this
instance, which is the instance itself.
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static long |
divideUnsigned(long dividend, long divisor)
Returns the unsigned quotient of dividing the first argument by
the second where each argument and the result is interpreted as
an unsigned value.
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double |
Returns the value of this Long as a double
after a widening primitive conversion.
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boolean |
Compares this object to the specified object.
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float |
Returns the value of this Long as a float after
a widening primitive conversion.
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static Long |
Determines the long value of the system property
with the specified name.
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static Long |
Determines the long value of the system property
with the specified name.
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static Long |
Returns the long value of the system property with
the specified name.
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int |
hashCode()
Returns a hash code for this Long.
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static int |
hashCode(long value)
Returns a hash code for a long value; compatible with
Long.hashCode().
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static long |
highestOneBit(long i)
Returns a long value with at most a single one-bit, in the
position of the highest-order ("leftmost") one-bit in the specified
long value.
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int |
intValue()
Returns the value of this Long as an int after
a narrowing primitive conversion.
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long |
Returns the value of this Long as a
long value.
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static long |
lowestOneBit(long i)
Returns a long value with at most a single one-bit, in the
position of the lowest-order ("rightmost") one-bit in the specified
long value.
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static long |
max(long a, long b)
Returns the greater of two long values
as if by calling Math.max.
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static long |
min(long a, long b)
Returns the smaller of two long values
as if by calling Math.min.
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static int |
numberOfLeadingZeros(long i)
Returns the number of zero bits preceding the highest-order
("leftmost") one-bit in the two's complement binary representation
of the specified long value.
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static int |
numberOfTrailingZeros(long i)
Returns the number of zero bits following the lowest-order ("rightmost")
one-bit in the two's complement binary representation of the specified
long value.
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static long |
parseLong(CharSequence s, int beginIndex, int endIndex, int radix)
Parses the CharSequence argument as a signed long in
the specified radix, beginning at the specified
beginIndex and extending to endIndex - 1.
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static long |
Parses the string argument as a signed decimal long.
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static long |
Parses the string argument as a signed long in the
radix specified by the second argument.
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static long |
parseUnsignedLong(CharSequence s, int beginIndex, int endIndex, int radix)
Parses the CharSequence argument as an unsigned long in
the specified radix, beginning at the specified
beginIndex and extending to endIndex - 1.
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static long |
Parses the string argument as an unsigned decimal long.
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static long |
parseUnsignedLong(String s, int radix)
Parses the string argument as an unsigned long in the
radix specified by the second argument.
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static long |
remainderUnsigned(long dividend, long divisor)
Returns the unsigned remainder from dividing the first argument
by the second where each argument and the result is interpreted
as an unsigned value.
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Resolves this instance as a ConstantDesc, the result of which is
the instance itself.
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static long |
reverse(long i)
Returns the value obtained by reversing the order of the bits in the
two's complement binary representation of the specified long
value.
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static long |
reverseBytes(long i)
Returns the value obtained by reversing the order of the bytes in the
two's complement representation of the specified long value.
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static long |
rotateLeft(long i, int distance)
Returns the value obtained by rotating the two's complement binary
representation of the specified long value left by the
specified number of bits.
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static long |
rotateRight(long i, int distance)
Returns the value obtained by rotating the two's complement binary
representation of the specified long value right by the
specified number of bits.
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short |
Returns the value of this Long as a short after
a narrowing primitive conversion.
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static int |
signum(long i)
Returns the signum function of the specified long value.
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static long |
sum(long a, long b)
Adds two long values together as per the + operator.
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static String |
toBinaryString(long i)
Returns a string representation of the long
argument as an unsigned integer in base 2.
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static String |
toHexString(long i)
Returns a string representation of the long
argument as an unsigned integer in base 16.
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static String |
toOctalString(long i)
Returns a string representation of the long
argument as an unsigned integer in base 8.
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toString()
Returns a String object representing this
Long's value.
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static String |
toString(long i)
Returns a String object representing the specified
long.
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static String |
toString(long i, int radix)
Returns a string representation of the first argument in the
radix specified by the second argument.
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static String |
toUnsignedString(long i)
Returns a string representation of the argument as an unsigned
decimal value.
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static String |
toUnsignedString(long i, int radix)
Returns a string representation of the first argument as an
unsigned integer value in the radix specified by the second
argument.
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static Long |
valueOf(long l)
Returns a Long instance representing the specified
long value.
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static Long |
Returns a Long object holding the value
of the specified String.
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static Long |
Returns a Long object holding the value
extracted from the specified String when parsed
with the radix given by the second argument.
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Methods inherited from class java.lang.Object |
public Long |
(long value) |
public Long |
(String s) |
throws |
public static String toString |
(long i, int radix) |
If the radix is smaller than Character.MIN_RADIX or larger than Character.MAX_RADIX, then the radix 10 is used instead.
If the first argument is negative, the first element of the result is the ASCII minus sign '-' ('\u002d'). If the first argument is not negative, no sign character appears in the result.
The remaining characters of the result represent the magnitude of the first argument. If the magnitude is zero, it is represented by a single zero character '0' ('\u0030'); otherwise, the first character of the representation of the magnitude will not be the zero character. The following ASCII characters are used as digits:
0123456789abcdefghijklmnopqrstuvwxyzThese are '\u0030' through '\u0039' and '\u0061' through '\u007a'. If radix is N, then the first N of these characters are used as radix-N digits in the order shown. Thus, the digits for hexadecimal (radix 16) are 0123456789abcdef. If uppercase letters are desired, the String.toUpperCase() method may be called on the result:
Long.toString(n, 16).toUpperCase()
public static String toUnsignedString |
(long i, int radix) |
If the radix is smaller than Character.MIN_RADIX or larger than Character.MAX_RADIX, then the radix 10 is used instead.
Note that since the first argument is treated as an unsigned value, no leading sign character is printed.
If the magnitude is zero, it is represented by a single zero character '0' ('\u0030'); otherwise, the first character of the representation of the magnitude will not be the zero character.
The behavior of radixes and the characters used as digits are the same as toString.
public static String toHexString |
(long i) |
The unsigned long value is the argument plus 264 if the argument is negative; otherwise, it is equal to the argument. This value is converted to a string of ASCII digits in hexadecimal (base 16) with no extra leading 0s.
The value of the argument can be recovered from the returned string s by calling Long.parseUnsignedLong(s, 16).
If the unsigned magnitude is zero, it is represented by a single zero character '0' ('\u0030'); otherwise, the first character of the representation of the unsigned magnitude will not be the zero character. The following characters are used as hexadecimal digits:
0123456789abcdefThese are the characters '\u0030' through '\u0039' and '\u0061' through '\u0066'. If uppercase letters are desired, the String.toUpperCase() method may be called on the result:
Long.toHexString(n).toUpperCase()
public static String toOctalString |
(long i) |
The unsigned long value is the argument plus 264 if the argument is negative; otherwise, it is equal to the argument. This value is converted to a string of ASCII digits in octal (base 8) with no extra leading 0s.
The value of the argument can be recovered from the returned string s by calling Long.parseUnsignedLong(s, 8).
If the unsigned magnitude is zero, it is represented by a single zero character '0' ('\u0030'); otherwise, the first character of the representation of the unsigned magnitude will not be the zero character. The following characters are used as octal digits:
01234567These are the characters '\u0030' through '\u0037'.
public static String toBinaryString |
(long i) |
The unsigned long value is the argument plus 264 if the argument is negative; otherwise, it is equal to the argument. This value is converted to a string of ASCII digits in binary (base 2) with no extra leading 0s.
The value of the argument can be recovered from the returned string s by calling Long.parseUnsignedLong(s, 2).
If the unsigned magnitude is zero, it is represented by a single zero character '0' ('\u0030'); otherwise, the first character of the representation of the unsigned magnitude will not be the zero character. The characters '0' ('\u0030') and '1' ('\u0031') are used as binary digits.
public static String toString |
(long i) |
public static String toUnsignedString |
(long i) |
public static long parseLong |
(String s, int radix) |
throws |
Note that neither the character L ('\u004C') nor l ('\u006C') is permitted to appear at the end of the string as a type indicator, as would be permitted in Java programming language source code - except that either L or l may appear as a digit for a radix greater than or equal to 22.
An exception of type NumberFormatException is thrown if any of the following situations occurs:
Examples:
parseLong("0", 10) returns 0L parseLong("473", 10) returns 473L parseLong("+42", 10) returns 42L parseLong("-0", 10) returns 0L parseLong("-FF", 16) returns -255L parseLong("1100110", 2) returns 102L parseLong("99", 8) throws a NumberFormatException parseLong("Hazelnut", 10) throws a NumberFormatException parseLong("Hazelnut", 36) returns 1356099454469L
public static long parseLong |
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throws |
The method does not take steps to guard against the CharSequence being mutated while parsing.
public static long parseLong |
(String s) |
throws |
Note that neither the character L ('\u004C') nor l ('\u006C') is permitted to appear at the end of the string as a type indicator, as would be permitted in Java programming language source code.
public static long parseUnsignedLong |
(String s, int radix) |
throws |
An exception of type NumberFormatException is thrown if any of the following situations occurs:
public static long parseUnsignedLong |
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throws |
The method does not take steps to guard against the CharSequence being mutated while parsing.
public static long parseUnsignedLong |
(String s) |
throws |
public static Long valueOf |
(String s, int radix) |
throws |
In other words, this method returns a Long object equal to the value of:
new Long(Long.parseLong(s, radix))
public static Long valueOf |
(String s) |
throws |
In other words, this method returns a Long object equal to the value of:
new Long(Long.parseLong(s))
public static Long valueOf |
(long l) |
public static Long decode |
(String nm) |
throws |
DecimalNumeral, HexDigits, and OctalDigits are as defined in section {@jls 3.10.1} of The Java Language Specification, except that underscores are not accepted between digits.
- DecodableString:
- Signopt DecimalNumeral
- Signopt 0x HexDigits
- Signopt 0X HexDigits
- Signopt # HexDigits
- Signopt 0 OctalDigits
- Sign:
- -
- +
The sequence of characters following an optional sign and/or radix specifier ("0x", "0X", "#", or leading zero) is parsed as by the Long.parseLong method with the indicated radix (10, 16, or 8). This sequence of characters must represent a positive value or a NumberFormatException will be thrown. The result is negated if first character of the specified String is the minus sign. No whitespace characters are permitted in the String.
public byte byteValue |
() |
public short shortValue |
() |
public int intValue |
() |
public long longValue |
() |
public float floatValue |
() |
public double doubleValue |
() |
public String toString |
() |
public int hashCode |
() |
(int)(this.longValue()^(this.longValue()>>>32))
public static int hashCode |
(long value) |
public boolean equals |
(Object obj) |
public static Long getLong |
(String nm) |
The first argument is treated as the name of a system property. System properties are accessible through the System.getProperty(java.lang.String) method. The string value of this property is then interpreted as a long value using the grammar supported by decode and a Long object representing this value is returned.
If there is no property with the specified name, if the specified name is empty or null, or if the property does not have the correct numeric format, then null is returned.
In other words, this method returns a Long object equal to the value of:
getLong(nm, null)
public static Long getLong |
(String nm, long val) |
The first argument is treated as the name of a system property. System properties are accessible through the System.getProperty(java.lang.String) method. The string value of this property is then interpreted as a long value using the grammar supported by decode and a Long object representing this value is returned.
The second argument is the default value. A Long object that represents the value of the second argument is returned if there is no property of the specified name, if the property does not have the correct numeric format, or if the specified name is empty or null.
In other words, this method returns a Long object equal to the value of:
getLong(nm, new Long(val))but in practice it may be implemented in a manner such as:
to avoid the unnecessary allocation of a Long object when the default value is not needed.Long result = getLong(nm, null); return (result == null) ? new Long(val) : result;
public static Long getLong |
Note that, in every case, neither L ('\u004C') nor l ('\u006C') is permitted to appear at the end of the property value as a type indicator, as would be permitted in Java programming language source code.
The second argument is the default value. The default value is returned if there is no property of the specified name, if the property does not have the correct numeric format, or if the specified name is empty or null.
public int compareTo |
(Long anotherLong) |
public static int compare |
(long x, long y) |
Long.valueOf(x).compareTo(Long.valueOf(y))
public static int compareUnsigned |
(long x, long y) |
public static long divideUnsigned |
(long dividend, long divisor) |
Note that in two's complement arithmetic, the three other basic arithmetic operations of add, subtract, and multiply are bit-wise identical if the two operands are regarded as both being signed or both being unsigned. Therefore separate addUnsigned, etc. methods are not provided.
public static long remainderUnsigned |
(long dividend, long divisor) |
public static long highestOneBit |
(long i) |
public static long lowestOneBit |
(long i) |
public static int numberOfLeadingZeros |
(long i) |
Note that this method is closely related to the logarithm base 2. For all positive long values x:
public static int numberOfTrailingZeros |
(long i) |
public static int bitCount |
(long i) |
public static long rotateLeft |
(long i, int distance) |
Note that left rotation with a negative distance is equivalent to right rotation: rotateLeft(val, -distance) == rotateRight(val, distance). Note also that rotation by any multiple of 64 is a no-op, so all but the last six bits of the rotation distance can be ignored, even if the distance is negative: rotateLeft(val, distance) == rotateLeft(val, distance & 0x3F).
public static long rotateRight |
(long i, int distance) |
Note that right rotation with a negative distance is equivalent to left rotation: rotateRight(val, -distance) == rotateLeft(val, distance). Note also that rotation by any multiple of 64 is a no-op, so all but the last six bits of the rotation distance can be ignored, even if the distance is negative: rotateRight(val, distance) == rotateRight(val, distance & 0x3F).
public static long reverse |
(long i) |
public static int signum |
(long i) |
public static long reverseBytes |
(long i) |
public static long sum |
(long a, long b) |
public static long max |
(long a, long b) |
public static long min |
(long a, long b) |
() |
public Long resolveConstantDesc |
(MethodHandles.Lookup lookup) |
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FlexDoc/Javadoc 2.0 Demo Java Doc |