45 |
|
* keys or values, and the specified key or value is |
46 |
|
* <tt>null</tt>. |
47 |
|
* |
48 |
< |
**/ |
48 |
> |
*/ |
49 |
|
V putIfAbsent(K key, V value); |
50 |
|
|
51 |
|
/** |
60 |
|
* except that the action is performed atomically. |
61 |
|
* @param key key with which the specified value is associated. |
62 |
|
* @param value value associated with the specified key. |
63 |
< |
* @return true if the value was removed |
63 |
> |
* @return true if the value was removed, false otherwise |
64 |
|
* @throws NullPointerException if this map does not permit <tt>null</tt> |
65 |
|
* keys or values, and the specified key or value is |
66 |
|
* <tt>null</tt>. |