ConcurrentHashMap.Replace Method
Definition
Important
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Overloads
| Name | Description |
|---|---|
| Replace(Object, Object) |
Replaces the entry for a key only if currently mapped to some value. |
| Replace(Object, Object, Object) |
Replaces the entry for a key only if currently mapped to a given value. |
Replace(Object, Object)
Replaces the entry for a key only if currently mapped to some value.
[Android.Runtime.Register("replace", "(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;", "GetReplace_Ljava_lang_Object_Ljava_lang_Object_Handler")]
public virtual Java.Lang.Object? Replace(Java.Lang.Object key, Java.Lang.Object value);[<Android.Runtime.Register("replace", "(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;", "GetReplace_Ljava_lang_Object_Ljava_lang_Object_Handler")>]
abstract member Replace : Java.Lang.Object * Java.Lang.Object -> Java.Lang.Object
override this.Replace : Java.Lang.Object * Java.Lang.Object -> Java.Lang.ObjectParameters
- key
- Object
key with which the specified value is associated
- value
- Object
value to be associated with the specified key
Returns
the previous value associated with the specified key,
or null if there was no mapping for the key
Implements
- Attributes
Remarks
Replaces the entry for a key only if currently mapped to some value.
This is equivalent to, for this map:
if (map.containsKey(key))
return map.put(key, value);
else
return null;
except that the action is performed atomically.
Java reference for java.util.concurrent.ConcurrentHashMap.replace.
Portions of this page are modifications based on work created and shared by the Android Open Source Project and used according to terms described in the Creative Commons 2.5 Attribution License.
Applies to
Replace(Object, Object, Object)
Replaces the entry for a key only if currently mapped to a given value.
[Android.Runtime.Register("replace", "(Ljava/lang/Object;Ljava/lang/Object;Ljava/lang/Object;)Z", "GetReplace_Ljava_lang_Object_Ljava_lang_Object_Ljava_lang_Object_Handler")]
public virtual bool Replace(Java.Lang.Object key, Java.Lang.Object oldValue, Java.Lang.Object newValue);[<Android.Runtime.Register("replace", "(Ljava/lang/Object;Ljava/lang/Object;Ljava/lang/Object;)Z", "GetReplace_Ljava_lang_Object_Ljava_lang_Object_Ljava_lang_Object_Handler")>]
abstract member Replace : Java.Lang.Object * Java.Lang.Object * Java.Lang.Object -> bool
override this.Replace : Java.Lang.Object * Java.Lang.Object * Java.Lang.Object -> boolParameters
- key
- Object
key with which the specified value is associated
- oldValue
- Object
value expected to be associated with the specified key
- newValue
- Object
value to be associated with the specified key
Returns
true if the value was replaced
Implements
- Attributes
Remarks
Replaces the entry for a key only if currently mapped to a given value.
This is equivalent to, for this map:
if (map.containsKey(key)
&& Objects.equals(map.get(key), oldValue)) {
map.put(key, newValue);
return true;
} else {
return false;
}
except that the action is performed atomically.
Java reference for java.util.concurrent.ConcurrentHashMap.replace.
Portions of this page are modifications based on work created and shared by the Android Open Source Project and used according to terms described in the Creative Commons 2.5 Attribution License.