public class WeakSet extends AbstractSet implements Set
Modifier and Type | Field and Description |
---|---|
protected ReferenceQueue |
queue
The reference queue used to get object removal notifications.
|
protected Set |
set
The Set which will be used for element storage.
|
Constructor and Description |
---|
WeakSet()
Construct a WeakSet based on a HashSet.
|
WeakSet(Set set)
Construct a WeakSet.
|
Modifier and Type | Method and Description |
---|---|
boolean |
add(Object obj)
Add an element to the set.
|
void |
clear()
Removes all of the elements from this set.
|
Object |
clone()
Returns a shallow copy of this WeakSet instance: the elements
themselves are not cloned.
|
boolean |
contains(Object obj)
Returns true if this set contains the specified element.
|
boolean |
isEmpty()
Returns true if this set contains no elements.
|
Iterator |
iterator()
Return an iteration over the elements in the set.
|
protected void |
maintain()
Maintain the elements in the set.
|
boolean |
remove(Object obj)
Removes the given element from this set if it is present.
|
int |
size()
Return the size of the set.
|
equals, hashCode, removeAll
addAll, containsAll, retainAll, toArray, toArray, toString
finalize, getClass, notify, notifyAll, wait, wait, wait
addAll, containsAll, equals, hashCode, removeAll, retainAll, spliterator, toArray, toArray
parallelStream, removeIf, stream
protected final ReferenceQueue queue
protected final Set set
public WeakSet(Set set)
WeakObject
references.set
- The Set which will be used for element storage.NullArgumentException
- Set is null.public WeakSet()
protected final void maintain()
public int size()
size
in interface Collection
size
in interface Set
size
in class AbstractCollection
public Iterator iterator()
iterator
in interface Iterable
iterator
in interface Collection
iterator
in interface Set
iterator
in class AbstractCollection
public boolean add(Object obj)
add
in interface Collection
add
in interface Set
add
in class AbstractCollection
obj
- Element to add to the set.public boolean isEmpty()
isEmpty
in interface Collection
isEmpty
in interface Set
isEmpty
in class AbstractCollection
public boolean contains(Object obj)
contains
in interface Collection
contains
in interface Set
contains
in class AbstractCollection
obj
- Element whose presence in this set is to be tested.public boolean remove(Object obj)
remove
in interface Collection
remove
in interface Set
remove
in class AbstractCollection
obj
- Object to be removed from this set, if present.public void clear()
clear
in interface Collection
clear
in interface Set
clear
in class AbstractCollection
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