public class IdentityMap extends AbstractHashedMap implements java.io.Serializable, java.lang.Cloneable
Map
implementation that matches keys and values based
on ==
not equals()
.
This map will violate the detail of various Map and map view contracts. As a general rule, don't compare this map to other maps.
Note that IdentityMap is not synchronized and is not thread-safe.
If you wish to use this map from multiple threads concurrently, you must use
appropriate synchronization. The simplest approach is to wrap this map
using Collections.synchronizedMap(Map)
. This class may throw
exceptions when accessed by concurrent threads without synchronization.
Constructor and Description |
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IdentityMap()
Constructs a new empty map with default size and load factor.
|
IdentityMap(int initialCapacity)
Constructs a new, empty map with the specified initial capacity.
|
IdentityMap(int initialCapacity,
float loadFactor)
Constructs a new, empty map with the specified initial capacity and
load factor.
|
IdentityMap(java.util.Map map)
Constructor copying elements from another map.
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Modifier and Type | Method and Description |
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java.lang.Object |
clone()
Clones the map without cloning the keys or values.
|
clear, containsKey, containsValue, entrySet, equals, get, hashCode, isEmpty, keySet, mapIterator, put, putAll, remove, size, toString, values
public IdentityMap()
public IdentityMap(int initialCapacity)
initialCapacity
- the initial capacityjava.lang.IllegalArgumentException
- if the initial capacity is less than onepublic IdentityMap(int initialCapacity, float loadFactor)
initialCapacity
- the initial capacityloadFactor
- the load factorjava.lang.IllegalArgumentException
- if the initial capacity is less than onejava.lang.IllegalArgumentException
- if the load factor is less than zeropublic IdentityMap(java.util.Map map)
map
- the map to copyjava.lang.NullPointerException
- if the map is nullCopyright © 2010 - 2020 Adobe. All Rights Reserved