java.util
Class Collections.EmptySet

java.lang.Object
  java.util.AbstractCollection
      java.util.AbstractSet
          java.util.Collections.EmptySet

All Implemented Interfaces:

Collection, Serializable, Set

Enclosing class:

Collections

private static class Collections.EmptySet

extends AbstractSet

implements Serializable

See Also:

Serialized Form

Field Summary

private static long

serialVersionUID

Constructor Summary

private

Collections.EmptySet()

Method Summary

boolean	contains(Object obj) Returns true if this set contains the specified element.
Iterator	iterator() Returns an iterator over the elements in this set.
private Object	readResolve()
int	size() Returns the number of elements in this set (its cardinality).

Methods inherited from class java.util.AbstractSet

equals, hashCode, removeAll

Methods inherited from class java.util.AbstractCollection

add, addAll, clear, containsAll, isEmpty, remove, retainAll, 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, containsAll, isEmpty, remove, retainAll, toArray, toArray

Field Detail

serialVersionUID

private static final long serialVersionUID

See Also:

Constant Field Values

Constructor Detail

Collections.EmptySet

private Collections.EmptySet()

Method Detail

iterator

public Iterator iterator()

Description copied from interface: Set

Returns an iterator over the elements in this set. The elements are returned in no particular order (unless this set is an instance of some class that provides a guarantee).

Specified by:

iterator in interface Set

Specified by:

iterator in class AbstractCollection

Returns:

an iterator over the elements contained in this collection.

size

public int size()

Description copied from interface: Set

Returns the number of elements in this set (its cardinality). If this set contains more than Integer.MAX_VALUE elements, returns Integer.MAX_VALUE.

Specified by:

size in interface Set

Specified by:

size in class AbstractCollection

Returns:

the number of elements in this collection.

contains

public boolean contains(Object obj)

Description copied from interface: Set

Returns true if this set contains the specified element. More formally, returns true if and only if this set contains an element e such that (o==null ? e==null : o.equals(e)).

Specified by:

contains in interface Set

Overrides:

contains in class AbstractCollection

Parameters:

obj - object to be checked for containment in this collection.

Returns:

true if this collection contains the specified element.

readResolve

private Object readResolve()