Java WeakHashMap Tutorial with Example program



Class WeakHashMap

Type Parameters:
K - the type of keys maintained by this map
V - the type of mapped values
All Implemented Interfaces:
Map

public class WeakHashMap
extends AbstractMap
implements Map
{

//
}


Since:
    1.2
   
See Also:
    HashMap, WeakReference

Nested classes/interfaces inherited from class java.util.AbstractMap
    AbstractMap.SimpleEntry, AbstractMap.SimpleImmutableEntry
   
Constructors summary

WeakHashMap()
    Constructs a new, empty WeakHashMap with the default initial capacity (16) and load factor (0.75).
   
WeakHashMap(int initialCapacity)
    Constructs a new, empty WeakHashMap with the given initial capacity and the default load factor (0.75).
   
WeakHashMap(int initialCapacity, float loadFactor)
    Constructs a new, empty WeakHashMap with the given initial capacity and the given load factor.
   
WeakHashMap(Map m)
    Constructs a new WeakHashMap with the same mappings as the specified map.
   
Methods
summary

void clear()
    Removes all of the mappings from this map.
   
boolean containsKey(Object key)
    Returns true if this map contains a mapping for the specified key.
   
boolean containsValue(Object value)
    Returns true if this map maps one or more keys to the specified value.
   
Set entrySet()
    Returns a Set view of the mappings contained in this map.
   
V get(Object key)
    Returns the value to which the specified key is mapped, or null if this map contains no mapping for the key.
   
boolean isEmpty()
    Returns true if this map contains no key-value mappings.
   
Set keySet()
    Returns a Set view of the keys contained in this map.
   
V put(K key, V value)
    Associates the specified value with the specified key in this map.
   
void putAll(Map m)
    Copies all of the mappings from the specified map to this map.
   
V remove(Object key)
    Removes the mapping for a key from this weak hash map if it is present.
   
int size()
    Returns the number of key-value mappings in this map.
   
Collection values()
    Returns a Collection view of the values contained in this map.

Methods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, wait, wait, wait,clone,equals,hashCode,toString



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