AbstractSet (FlexDoc/Javadoc 2.0 Demo)

FlexDoc/Javadoc 2.0
Demo Java Doc

Class AbstractSet<E>

java.util.AbstractSet<E>

E - the type of elements maintained by this set

All Implemented Interfaces:

Direct Known Subclasses:

public abstract class AbstractSet<E>

This class provides a skeletal implementation of the Set interface to minimize the effort required to implement this interface.

The process of implementing a set by extending this class is identical to that of implementing a Collection by extending AbstractCollection, except that all of the methods and constructors in subclasses of this class must obey the additional constraints imposed by the Set interface (for instance, the add method must not permit addition of multiple instances of an object to a set).

Note that this class does not override any of the implementations from the AbstractCollection class. It merely adds implementations for equals and hashCode.

This class is a member of the Java Collections Framework.

Josh Bloch, Neal Gafter

Compares the specified object with this set for equality.

Returns the hash code value for this set.

Removes from this set all of its elements that are contained in the specified collection (optional operation).

Methods inherited from class java.util.AbstractCollection

Methods inherited from class java.lang.Object

Methods inherited from interface java.util.Collection

Methods inherited from interface java.lang.Iterable

Methods inherited from interface java.util.Set

copyOf, of, of, of, of, of, of, of, of, of, of, of, of

protected AbstractSet

Sole constructor. (For invocation by subclass constructors, typically implicit.)

public boolean equals

Compares the specified object with this set for equality. Returns true if the given object is also a set, the two sets have the same size, and every member of the given set is contained in this set. This ensures that the equals method works properly across different implementations of the Set interface.

This implementation first checks if the specified object is this set; if so it returns true. Then, it checks if the specified object is a set whose size is identical to the size of this set; if not, it returns false. If so, it returns containsAll((Collection) o).

Specified by:

equals in interface Collection<E>

equals in interface Set<E>

Overrides:

equals in class Object

Parameters:

o - object to be compared for equality with this set

Returns:

true if the specified object is equal to this set

public boolean removeAll

Removes from this set all of its elements that are contained in the specified collection (optional operation). If the specified collection is also a set, this operation effectively modifies this set so that its value is the asymmetric set difference of the two sets.

This implementation determines which is the smaller of this set and the specified collection, by invoking the size method on each. If this set has fewer elements, then the implementation iterates over this set, checking each element returned by the iterator in turn to see if it is contained in the specified collection. If it is so contained, it is removed from this set with the iterator's remove method. If the specified collection has fewer elements, then the implementation iterates over the specified collection, removing from this set each element returned by the iterator, using this set's remove method.

Note that this implementation will throw an UnsupportedOperationException if the iterator returned by the iterator method does not implement the remove method.

Specified by:

removeAll in interface Collection<E>

removeAll in interface Set<E>

Overrides:

removeAll in class AbstractCollection<E>

Parameters:

c - collection containing elements to be removed from this set

Returns:

true if this set changed as a result of the call

Throws:

UnsupportedOperationException - if the removeAll operation is not supported by this set

ClassCastException - if the class of an element of this set is incompatible with the specified collection (optional)

NullPointerException - if this set contains a null element and the specified collection does not permit null elements (optional), or if the specified collection is null

Method Summary
boolean	equals(Object o) Compares the specified object with this set for equality.
int	hashCode() Returns the hash code value for this set.
boolean	removeAll(Collection<?> c) Removes from this set all of its elements that are contained in the specified collection (optional operation).

Constructor Summary
protected	AbstractSet() Sole constructor.