| 88 |
|
* mapped values are (perhaps transiently) not used or all take the |
| 89 |
|
* same mapping value. |
| 90 |
|
* |
| 91 |
– |
* <p>A ConcurrentHashMap can be used as scalable frequency map (a |
| 92 |
– |
* form of histogram or multiset) by using {@link LongAdder} values |
| 93 |
– |
* and initializing via {@link #computeIfAbsent}. For example, to add |
| 94 |
– |
* a count to a {@code ConcurrentHashMap<String,LongAdder> freqs}, you |
| 95 |
– |
* can use {@code freqs.computeIfAbsent(k -> new |
| 96 |
– |
* LongAdder()).increment();} |
| 97 |
– |
* |
| 91 |
|
* <p>This class and its views and iterators implement all of the |
| 92 |
|
* <em>optional</em> methods of the {@link Map} and {@link Iterator} |
| 93 |
|
* interfaces. |
