File	Doc	Category	Size	Date	Package
ConcurrentMap.java	API Doc	Android 1.5 API	4685	Wed May 06 22:41:02 BST 2009	java.util.concurrent

ConcurrentMap

Fields Summary

Constructors Summary

Methods Summary
public V	putIfAbsent(K key, V value) If the specified key is not already associated with a value, associate it with the given value. This is equivalent to if (!map.containsKey(key)) return map.put(key, value); else return map.get(key); Except that the action is performed atomically. param key key with which the specified value is to be associated. param value value to be associated with the specified key. return previous value associated with specified key, or null if there was no mapping for key. A null return can also indicate that the map previously associated null with the specified key, if the implementation supports null values. throws UnsupportedOperationException if the put operation is not supported by this map. throws ClassCastException if the class of the specified key or value prevents it from being stored in this map. throws IllegalArgumentException if some aspect of this key or value prevents it from being stored in this map. throws NullPointerException if this map does not permit null keys or values, and the specified key or value is null.
public boolean	remove(java.lang.Object key, java.lang.Object value) Remove entry for key only if currently mapped to given value. Acts as if ((map.containsKey(key) && map.get(key).equals(value)) { map.remove(key); return true; } else return false; except that the action is performed atomically. param key key with which the specified value is associated. param value value associated with the specified key. return true if the value was removed, false otherwise throws NullPointerException if this map does not permit null keys or values, and the specified key or value is null.
public boolean	replace(K key, V oldValue, V newValue) Replace entry for key only if currently mapped to given value. Acts as 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. param key key with which the specified value is associated. param oldValue value expected to be associated with the specified key. param newValue value to be associated with the specified key. return true if the value was replaced throws NullPointerException if this map does not permit null keys or values, and the specified key or value is null.
public V	replace(K key, V value) Replace entry for key only if currently mapped to some value. Acts as if ((map.containsKey(key)) { return map.put(key, value); } else return null; except that the action is performed atomically. param key key with which the specified value is associated. param value value to be associated with the specified key. return previous value associated with specified key, or null if there was no mapping for key. A null return can also indicate that the map previously associated null with the specified key, if the implementation supports null values. throws NullPointerException if this map does not permit null keys or values, and the specified key or value is null.