E - the type of elements maintained by this setpublic class WeakSet<E> extends AbstractSet<E> implements Cloneable, Serializable
| Constructor and Description |
|---|
WeakSet()
Constructs a new, empty WeakSet with the default initial
capacity (16) and load factor (0.75).
|
WeakSet(Collection<? extends E> s)
Constructs a new WeakSet with the same mappings as the
specified map.
|
WeakSet(int initialCapacity)
Constructs a new, empty WeakSet with the given initial
capacity and the default load factor (0.75).
|
WeakSet(int initialCapacity,
float loadFactor)
Constructs a new, empty WeakSet with the given initial
capacity and the given load factor.
|
| Modifier and Type | Method and Description |
|---|---|
boolean |
add(E e) |
void |
clear() |
Object |
clone() |
boolean |
contains(Object o) |
boolean |
containsAll(Collection<?> c) |
boolean |
equals(Object o) |
int |
hashCode() |
boolean |
isEmpty() |
Iterator<E> |
iterator() |
E |
putIfAbsent(E e)
Put object in this set if equal one is not yet in set.
|
boolean |
remove(Object o) |
boolean |
removeAll(Collection<?> c) |
void |
resize(int newCapacity)
compact set if it is empty by setting new capacity
|
boolean |
retainAll(Collection<?> c) |
int |
size() |
Object[] |
toArray() |
<T> T[] |
toArray(T[] a) |
String |
toString() |
addAllfinalize, getClass, notify, notifyAll, wait, wait, waitaddAll, spliteratorparallelStream, removeIf, streampublic WeakSet(int initialCapacity,
float loadFactor)
initialCapacity - The initial capacity of the WeakSetloadFactor - The load factor of the WeakSetIllegalArgumentException - if the initial capacity is negative,
or if the load factor is nonpositive.public WeakSet(int initialCapacity)
initialCapacity - The initial capacity of the WeakSetIllegalArgumentException - if the initial capacity is negativepublic WeakSet()
public WeakSet(Collection<? extends E> s)
s - the map whose mappings are to be placed in this mapNullPointerException - if the specified map is nullpublic void clear()
clear in interface Collection<E>clear in interface Set<E>clear in class AbstractCollection<E>public int size()
size in interface Collection<E>size in interface Set<E>size in class AbstractCollection<E>public boolean isEmpty()
isEmpty in interface Collection<E>isEmpty in interface Set<E>isEmpty in class AbstractCollection<E>public boolean contains(Object o)
contains in interface Collection<E>contains in interface Set<E>contains in class AbstractCollection<E>public boolean remove(Object o)
remove in interface Collection<E>remove in interface Set<E>remove in class AbstractCollection<E>public void resize(int newCapacity)
newCapacity - new capacitypublic boolean add(E e)
add in interface Collection<E>add in interface Set<E>add in class AbstractCollection<E>WeakSet.putIfAbsent(E)public Object[] toArray()
toArray in interface Collection<E>toArray in interface Set<E>toArray in class AbstractCollection<E>public <T> T[] toArray(T[] a)
toArray in interface Collection<E>toArray in interface Set<E>toArray in class AbstractCollection<E>public String toString()
toString in class AbstractCollection<E>public int hashCode()
hashCode in interface Collection<E>hashCode in interface Set<E>hashCode in class AbstractSet<E>public boolean equals(Object o)
equals in interface Collection<E>equals in interface Set<E>equals in class AbstractSet<E>public boolean containsAll(Collection<?> c)
containsAll in interface Collection<E>containsAll in interface Set<E>containsAll in class AbstractCollection<E>public boolean removeAll(Collection<?> c)
removeAll in interface Collection<E>removeAll in interface Set<E>removeAll in class AbstractSet<E>public boolean retainAll(Collection<?> c)
retainAll in interface Collection<E>retainAll in interface Set<E>retainAll in class AbstractCollection<E>public E putIfAbsent(E e)
WeakSet<MyClass> set = new WeakSet<MyClass>();
...
MyClass sharedValue = set.putIfAbsent(new MyClass("abc));
e - object to put in set.