Package com.google.common.collect

Class ForwardingMap.StandardKeySet

java.lang.Object

java.util.AbstractCollection<E>

java.util.AbstractSet<E>

com.google.common.collect.ForwardingMap.StandardKeySet

All Implemented Interfaces:

java.lang.Iterable<K>, java.util.Collection<K>, java.util.Set<K>

Enclosing class:

ForwardingMap<K,V>

@Beta
protected class ForwardingMap.StandardKeySet
extends java.util.AbstractSet<E>

A sensible implementation of Map.keySet() in terms of the following methods: ForwardingMap.clear(), ForwardingMap.containsKey(java.lang.Object), ForwardingMap.isEmpty(), ForwardingMap.remove(java.lang.Object), ForwardingMap.size(), and the Set.iterator() method of ForwardingMap.entrySet(). In many cases, you may wish to override ForwardingMap.keySet() to forward to this implementation or a subclass thereof.

Since:

10.0

Constructor Summary

Constructors

Constructor	Description
StandardKeySet()	Constructor for use by subclasses.

Method Summary

Modifier and Type	Method	Description
void	clear()
boolean	contains(java.lang.Object o)
boolean	isEmpty()
java.util.Iterator<K>	iterator()
boolean	remove(java.lang.Object o)
boolean	removeAll(java.util.Collection<?> c)
boolean	retainAll(java.util.Collection<?> c)
int	size()

Methods inherited from class java.util.AbstractSet

equals, hashCode

Methods inherited from class java.util.AbstractCollection

add, addAll, containsAll, toArray, toArray, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Collection

parallelStream, removeIf, stream, toArray

Methods inherited from interface java.lang.Iterable

forEach

Methods inherited from interface java.util.Set

add, addAll, containsAll, spliterator, toArray, toArray

Constructor Detail

StandardKeySet

public StandardKeySet()

Constructor for use by subclasses.

Method Detail

iterator

public java.util.Iterator<K> iterator()

Specified by:

iterator in interface java.util.Collection<K>

Specified by:

iterator in interface java.lang.Iterable<K>

Specified by:

iterator in interface java.util.Set<K>

Specified by:

iterator in class java.util.AbstractCollection<K>

size

public int size()

Specified by:

size in interface java.util.Collection<K>

Specified by:

size in interface java.util.Set<K>

Specified by:

size in class java.util.AbstractCollection<K>

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface java.util.Collection<K>

Specified by:

isEmpty in interface java.util.Set<K>

Overrides:

isEmpty in class java.util.AbstractCollection<K>

contains

public boolean contains(java.lang.Object o)

Specified by:

contains in interface java.util.Collection<K>

Specified by:

contains in interface java.util.Set<K>

Overrides:

contains in class java.util.AbstractCollection<K>

remove

public boolean remove(java.lang.Object o)

Specified by:

remove in interface java.util.Collection<K>

Specified by:

remove in interface java.util.Set<K>

Overrides:

remove in class java.util.AbstractCollection<K>

clear

public void clear()

Specified by:

clear in interface java.util.Collection<K>

Specified by:

clear in interface java.util.Set<K>

Overrides:

clear in class java.util.AbstractCollection<K>

removeAll

public boolean removeAll(java.util.Collection<?> c)

Specified by:

removeAll in interface java.util.Collection<E>

Specified by:

removeAll in interface java.util.Set<E>

Overrides:

removeAll in class java.util.AbstractSet<E>

retainAll

public boolean retainAll(java.util.Collection<?> c)

Specified by:

retainAll in interface java.util.Collection<E>

Specified by:

retainAll in interface java.util.Set<E>

Overrides:

retainAll in class java.util.AbstractCollection<E>