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Java Create a ConcurrentHashMap

// ConcurrentHashMap with capacity 8 and load factor 0.6
ConcurrentHashMap<Key, Value> numbers = new ConcurrentHashMap<>(8, 0.6f);
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concurrenthashmap in java

Maps are naturally one of the most widely style of Java collection.

And, importantly, HashMap is not a thread-safe implementation, while Hashtable does provide thread-safety by synchronizing operations.

Even though Hashtable is thread safe, it is not very efficient. Another fully synchronized Map, Collections.synchronizedMap, does not exhibit great efficiency either. If we want thread-safety with high throughput under high concurrency, these implementations aren't the way to go.

To solve the problem, the Java Collections Framework introduced ConcurrentMap in Java 1.5.

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