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The ConcurrentHashMap class in Java is part of the java.util.concurrent package and provides a thread-safe implementation of a hash table. Unlike HashMap, it allows concurrent read and write operations, making it highly suitable for use in multi-threaded environments.
This guide covers various methods available in the ConcurrentHashMap class. Each method is described in simple terms to help beginners understand how to use them. These methods allow you to perform operations like adding, removing, and checking for elements in a thread-safe manner.
For more detailed information, please refer to the official Java SE Documentation and additional resources on Java Collections Tutorial. Also, check out this comprehensive ConcurrentHashMap Methods Tutorial for more examples and usage scenarios.
Java ConcurrentHashMap Class Methods
The table below contains various methods of the Java ConcurrentHashMap class, each with a link to a detailed explanation, examples, and real-world uses. Click on the method names to learn more about how to use them effectively in your applications.
| Method | Description |
|---|---|
| put() | Adds a key-value pair to the map. If the key already exists, it updates the value. |
| get() | Returns the value to which the specified key is mapped, or null if the map contains no mapping for the key. |
| containsKey() | Returns true if this map contains a mapping for the specified key. |
| containsValue() | Returns true if this map maps one or more keys to the specified value. |
| remove() | Removes the key (and its corresponding value) from this map. |
| size() | Returns the number of key-value mappings in this map. |
| isEmpty() | Returns true if this map contains no key-value mappings. |
| keySet() | Returns a Set view of the keys contained in this map. |
| values() | Returns a Collection view of the values contained in this map. |
| putIfAbsent() | Associates the specified value with the specified key if the key is not already associated with a value. |
| replace() | Replaces the entry for a key only if currently mapped to a given value. |
| forEach() | Performs the given action for each entry in the map until all entries have been processed or the action throws an exception. |
| keys() | Returns an enumeration of the keys in this map. |
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