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Préférences
Moteurs de recherche
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JavaTM 2 Platform Std. Ed. v1.5.0
java.util.concurrent
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Nested Class Summary |
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Nested classes/interfaces inherited from interface java.util.Map |
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Map.Entry<K,V> |
Method Summary | |
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V |
putIfAbsent(K key,
V value)
If the specified key is not already associated with a value, associate it with the given value. |
boolean |
remove(Object key,
Object value)
Remove entry for key only if currently mapped to given value. |
V |
replace(K key,
V value)
Replace entry for key only if currently mapped to some value. |
boolean |
replace(K key,
V oldValue,
V newValue)
Replace entry for key only if currently mapped to given value. |
Methods inherited from interface java.util.Map |
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clear, containsKey, containsValue, entrySet, equals, get, hashCode, isEmpty, keySet, put, putAll, remove, size, values |
Method Detail |
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V putIfAbsent(K key, V value)
if (!map.containsKey(key)) return map.put(key, value); else return map.get(key);Except that the action is performed atomically.
key
- key with which the specified value is to be associated.value
- value to be associated with the specified key.
UnsupportedOperationException
- if the put operation is
not supported by this map.
ClassCastException
- if the class of the specified key or value
prevents it from being stored in this map.
IllegalArgumentException
- if some aspect of this key or value
prevents it from being stored in this map.
NullPointerException
- if this map does not permit null
keys or values, and the specified key or value is
null.boolean remove(Object key, Object value)
if ((map.containsKey(key) && map.get(key).equals(value)) { map.remove(key); return true; } else return false;except that the action is performed atomically.
key
- key with which the specified value is associated.value
- value associated with the specified key.
UnsupportedOperationException
- if the remove operation is
not supported by this map.
NullPointerException
- if this map does not permit null
keys or values, and the specified key or value is
null.boolean replace(K key, V oldValue, V newValue)
if ((map.containsKey(key) && map.get(key).equals(oldValue)) { map.put(key, newValue); return true; } else return false;except that the action is performed atomically.
key
- key with which the specified value is associated.oldValue
- value expected to be associated with the specified key.newValue
- value to be associated with the specified key.
UnsupportedOperationException
- if the put operation is
not supported by this map.
NullPointerException
- if this map does not permit null
keys or values, and the specified key or value is
null.V replace(K key, V value)
if ((map.containsKey(key)) { return map.put(key, value); } else return null;except that the action is performed atomically.
key
- key with which the specified value is associated.value
- value to be associated with the specified key.
UnsupportedOperationException
- if the put operation is
not supported by this map.
NullPointerException
- if this map does not permit null
keys or values, and the specified key or value is
null.