java.util
Class AbstractSet

java.lang.Object
  java.util.AbstractCollection
      java.util.AbstractSet

All Implemented Interfaces:

Iterable, Collection, Set

Direct Known Subclasses:

CopyOnWriteArraySet, EnumSet, HashSet, TreeSet

public abstract class AbstractSet
extends AbstractCollection
implements Set

AbstractSet is an abstract implementation of the Set interface. This Implementation does not support adding. A subclass must implement the abstract methods iterator() and size().

Constructor Summary

protected

AbstractSet() Constructs a new instance of this AbstractSet.

Method Summary

boolean	equals(Object object) Compares the specified object to this Set and answer if they are equal.
int	hashCode() Returns an integer hash code for the receiver.
boolean	removeAll(Collection collection) Removes all occurrences in this Collection of each object in the specified Collection.

Methods inherited from class java.util.AbstractCollection

add, addAll, clear, contains, containsAll, isEmpty, iterator, remove, retainAll, size, toArray, toArray, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Set

add, addAll, clear, contains, containsAll, isEmpty, iterator, remove, retainAll, size, toArray, toArray

Constructor Detail

AbstractSet

protected AbstractSet()

Constructs a new instance of this AbstractSet.

Method Detail

equals

public boolean equals(Object object)

Compares the specified object to this Set and answer if they are equal. The object must be an instance of Set and contain the same objects.

Specified by:

equals in interface Collection

Specified by:

equals in interface Set

Overrides:

equals in class Object

Parameters:

object - the object to compare with this object

Returns:

true if the specified object is equal to this Set, false otherwise

See Also:

hashCode()

hashCode

public int hashCode()

Returns an integer hash code for the receiver. Objects which are equal answer the same value for this method.

Specified by:

hashCode in interface Collection

Specified by:

hashCode in interface Set

Overrides:

hashCode in class Object

Returns:

the receiver's hash

See Also:

equals(Object)

removeAll

public boolean removeAll(Collection collection)

Removes all occurrences in this Collection of each object in the specified Collection.

Specified by:

removeAll in interface Collection

Specified by:

removeAll in interface Set

Overrides:

removeAll in class AbstractCollection

Parameters:

collection - the Collection of objects to remove

Returns:

true if this Collection is modified, false otherwise

Throws:

UnsupportedOperationException - when removing from this Collection is not supported