Class ForwardingMap.StandardKeySet

java.lang.Object

java.util.AbstractCollection<K>

java.util.AbstractSet<K>

com.google.common.collect.ForwardingMap.StandardKeySet

All Implemented Interfaces:

Iterable<K>, Collection<K>, Set<K>

Enclosing class:

ForwardingMap<K extends @Nullable Object, V extends @Nullable Object>

protected class ForwardingMap.StandardKeySet
extends AbstractSet<K>

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

Author:

Kevin Bourrillion, Jared Levy, Louis Wasserman

Constructor Summary

Constructors

Constructor	Description
StandardKeySet()	Constructor for use by subclasses.

Method Summary

Modifier and Type	Method	Description
void	clear()
boolean	contains(@Nullable Object o)
boolean	isEmpty()
Iterator<K>	iterator()
boolean	remove(@Nullable Object o)
boolean	removeAll(Collection<?> c)
boolean	retainAll(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 Details

StandardKeySet

public StandardKeySet()

Constructor for use by subclasses.

Method Details

iterator

public Iterator<K> iterator()

Specified by:

iterator in interface Collection<K extends @Nullable Object>

Specified by:

iterator in interface Iterable<K extends @Nullable Object>

Specified by:

iterator in interface Set<K extends @Nullable Object>

Specified by:

iterator in class AbstractCollection<K extends @Nullable Object>

size

public int size()

Specified by:

size in interface Collection<K extends @Nullable Object>

Specified by:

size in interface Set<K extends @Nullable Object>

Specified by:

size in class AbstractCollection<K extends @Nullable Object>

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface Collection<K extends @Nullable Object>

Specified by:

isEmpty in interface Set<K extends @Nullable Object>

Overrides:

isEmpty in class AbstractCollection<K extends @Nullable Object>

contains

public boolean contains(@Nullable Object o)

Specified by:

contains in interface Collection<K extends @Nullable Object>

Specified by:

contains in interface Set<K extends @Nullable Object>

Overrides:

contains in class AbstractCollection<K extends @Nullable Object>

remove

public boolean remove(@Nullable Object o)

Specified by:

remove in interface Collection<K extends @Nullable Object>

Specified by:

remove in interface Set<K extends @Nullable Object>

Overrides:

remove in class AbstractCollection<K extends @Nullable Object>

clear

public void clear()

Specified by:

clear in interface Collection<K extends @Nullable Object>

Specified by:

clear in interface Set<K extends @Nullable Object>

Overrides:

clear in class AbstractCollection<K extends @Nullable Object>

removeAll

public boolean removeAll(Collection<?> c)

Specified by:

removeAll in interface Collection<E extends @Nullable Object>

Specified by:

removeAll in interface Set<E extends @Nullable Object>

Overrides:

removeAll in class AbstractSet<E extends @Nullable Object>

retainAll

public boolean retainAll(Collection<?> c)

Specified by:

retainAll in interface Collection<E extends @Nullable Object>

Specified by:

retainAll in interface Set<E extends @Nullable Object>

Overrides:

retainAll in class AbstractCollection<E extends @Nullable Object>