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org.openide.util 8.15.1 | |||||||||
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java.lang.Objectjava.util.AbstractCollection<E>
java.util.AbstractSet<E>
org.openide.util.WeakSet<E>
E
- the type of elements maintained by this setpublic class WeakSet<E>
This class provides storage functionality with Weak-referenced entries and new method putIfAbsent. Set implementation is backed by a hash table. It also provides method resize for changing capacity of internal hash table (can be used for reducing memory occupied by empty set which previously had big number of objects, but they were GCed) Access to set is not thread safe.
putIfAbsent(Object)
,
resize(int)
,
Serialized FormConstructor Summary | |
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WeakSet()
Constructs a new, empty WeakSet with the default initial capacity (16) and load factor (0.75). |
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WeakSet(Collection<? extends E> s)
Constructs a new WeakSet with the same mappings as the specified map. |
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WeakSet(int initialCapacity)
Constructs a new, empty WeakSet with the given initial capacity and the default load factor (0.75). |
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WeakSet(int initialCapacity,
float loadFactor)
Constructs a new, empty WeakSet with the given initial capacity and the given load factor. |
Method Summary | ||
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boolean |
add(E e)
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void |
clear()
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Object |
clone()
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boolean |
contains(Object o)
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boolean |
containsAll(Collection<?> c)
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boolean |
equals(Object o)
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int |
hashCode()
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boolean |
isEmpty()
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Iterator<E> |
iterator()
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E |
putIfAbsent(E e)
Put object in this set if equal one is not yet in set. |
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boolean |
remove(Object o)
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boolean |
removeAll(Collection<?> c)
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void |
resize(int newCapacity)
compact set if it is empty by setting new capacity |
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boolean |
retainAll(Collection<?> c)
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int |
size()
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Object[] |
toArray()
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toArray(T[] a)
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String |
toString()
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Methods inherited from class java.util.AbstractCollection |
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addAll |
Methods inherited from class java.lang.Object |
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finalize, getClass, notify, notifyAll, wait, wait, wait |
Methods inherited from interface java.util.Set |
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addAll |
Constructor Detail |
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public WeakSet(int initialCapacity, float loadFactor)
initialCapacity
- The initial capacity of the WeakSetloadFactor
- The load factor of the WeakSet
IllegalArgumentException
- if the initial capacity is negative,
or if the load factor is nonpositive.public WeakSet(int initialCapacity)
initialCapacity
- The initial capacity of the WeakSet
IllegalArgumentException
- if the initial capacity is negativepublic WeakSet()
public WeakSet(Collection<? extends E> s)
s
- the map whose mappings are to be placed in this map
NullPointerException
- if the specified map is nullMethod Detail |
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public 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>
putIfAbsent(E)
public Iterator<E> iterator()
iterator
in interface Iterable<E>
iterator
in interface Collection<E>
iterator
in interface Set<E>
iterator
in class AbstractCollection<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.
public Object clone()
clone
in class Object
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