E - the type of the elements in this setV - the dummy value type in this mappublic final class MapBackedSet<E,V> extends Object implements Set<E>, Serializable
Map to obtain Set behaviour.
This class is used to create a Set with the same properties as
the key set of any map. Thus, a ReferenceSet can be created by wrapping a
ReferenceMap in an instance of this class.
Most map implementation can be used to create a set by passing in dummy values.
Exceptions include BidiMap implementations, as they require unique values.
| Modifier and Type | Method and Description |
|---|---|
boolean |
add(E obj) |
boolean |
addAll(Collection<? extends E> coll) |
void |
clear() |
boolean |
contains(Object obj) |
boolean |
containsAll(Collection<?> coll) |
boolean |
equals(Object obj) |
int |
hashCode() |
boolean |
isEmpty() |
Iterator<E> |
iterator() |
static <E,V> MapBackedSet<E,V> |
mapBackedSet(Map<E,? super V> map)
Factory method to create a set from a map.
|
static <E,V> MapBackedSet<E,V> |
mapBackedSet(Map<E,? super V> map,
V dummyValue)
Factory method to create a set from a map.
|
boolean |
remove(Object obj) |
boolean |
removeAll(Collection<?> coll) |
boolean |
removeIf(Predicate<? super E> filter) |
boolean |
retainAll(Collection<?> coll) |
int |
size() |
Object[] |
toArray() |
<T> T[] |
toArray(T[] array) |
clone, finalize, getClass, notify, notifyAll, toString, wait, wait, waitspliteratorparallelStream, streampublic static <E,V> MapBackedSet<E,V> mapBackedSet(Map<E,? super V> map)
E - the element typeV - the dummy value type in the mapmap - the map to decorate, must not be nullNullPointerException - if map is nullpublic static <E,V> MapBackedSet<E,V> mapBackedSet(Map<E,? super V> map, V dummyValue)
E - the element typeV - the dummy value type in the mapmap - the map to decorate, must not be nulldummyValue - the dummy value to useNullPointerException - if map is nullpublic int size()
public boolean isEmpty()
public boolean containsAll(Collection<?> coll)
containsAll in interface Collection<E>containsAll in interface Set<E>public boolean addAll(Collection<? extends E> coll)
public boolean removeIf(Predicate<? super E> filter)
removeIf in interface Collection<E>public boolean removeAll(Collection<?> coll)
public boolean retainAll(Collection<?> coll)
public void clear()
public <T> T[] toArray(T[] array)
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