public class WeakIdentityHashMap extends Object implements Map
Based on java.util.WeakHashMap
IdentityHashMap
,
WeakHashMap
Constructor and Description |
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WeakIdentityHashMap()
Constructs a new, empty WeakIdentityHashMap with the default
initial capacity (16) and the default load factor (0.75).
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WeakIdentityHashMap(int initialCapacity)
Constructs a new, empty WeakIdentityHashMap with the given
initial capacity and the default load factor, which is 0.75.
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WeakIdentityHashMap(int initialCapacity,
float loadFactor)
Constructs a new, empty WeakIdentityHashMap with the given
initial capacity and the given load factor.
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WeakIdentityHashMap(Map t)
Constructs a new WeakIdentityHashMap with the same mappings as
the specified Map.
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Modifier and Type | Method and Description |
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void |
clear()
Removes all mappings from this map.
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boolean |
containsKey(Object key)
Returns true if this map contains a mapping for the
specified key.
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boolean |
containsValue(Object value)
Returns true if this map maps one or more keys to the
specified value.
|
Set |
entrySet()
Returns a collection view of the mappings contained in this map.
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Object |
get(Object key)
Returns the value to which the specified key is mapped in this weak
hash map, or null if the map contains no mapping for
this 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.
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Object |
put(Object key,
Object value)
Associates the specified value with the specified key in this map.
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void |
putAll(Map t)
Copies all of the mappings from the specified map to this map These
mappings will replace any mappings that this map had for any of the
keys currently in the specified map.
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Object |
remove(Object key)
Removes the mapping for this key from this map if present.
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int |
size()
Returns the number of key-value mappings in this map.
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Collection |
values()
Returns a collection view of the values contained in this map.
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
compute, computeIfAbsent, computeIfPresent, equals, forEach, getOrDefault, hashCode, merge, putIfAbsent, remove, replace, replace, replaceAll
public WeakIdentityHashMap(int initialCapacity, float loadFactor)
initialCapacity
- The initial capacity of the
WeakIdentityHashMaploadFactor
- The load factor of the
WeakIdentityHashMapIllegalArgumentException
- If the initial capacity is negative,
or if the load factor is nonpositive.public WeakIdentityHashMap(int initialCapacity)
initialCapacity
- The initial capacity of the
WeakIdentityHashMapIllegalArgumentException
- If the initial capacity is negative.public WeakIdentityHashMap()
public WeakIdentityHashMap(Map t)
t
- the map whose mappings are to be placed in this map.NullPointerException
- if the specified map is null.public int size()
public boolean isEmpty()
public Object get(Object key)
get
in interface Map
key
- the key whose associated value is to be returned.put(Object, Object)
public boolean containsKey(Object key)
containsKey
in interface Map
key
- The key whose presence in this map is to be testedpublic Object put(Object key, Object value)
put
in interface Map
key
- key with which the specified value is to be associated.value
- value to be associated with the specified key.public void putAll(Map t)
putAll
in interface Map
t
- mappings to be stored in this map.NullPointerException
- if the specified map is null.public boolean containsValue(Object value)
containsValue
in interface Map
value
- value whose presence in this map is to be tested.public Set keySet()
public Collection values()
public Set entrySet()
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