The ConcurrentHashMap class in Java is part of the Java Collections Framework and is a thread-safe variant of HashMap. It is designed for concurrent access and provides better performance in a multi-threaded environment. ConcurrentHashMap allows multiple threads to read and write without any conflicts, making it a valuable tool for high-performance applications.
This guide covers various methods available in the ConcurrentHashMap class, offering a comprehensive understanding of how to manipulate and interact with concurrent hash maps in Java. These methods are essential for efficient coding practices and help in performing operations like adding, removing, and checking for key-value pairs, all while maintaining thread safety.
For more detailed information, you can refer to the official Java SE Documentation and additional resources on Java Collections Tutorial.
ConcurrentHashMap Class Methods
| Method | Description |
|---|---|
| put() | Adds a key-value pair to the ConcurrentHashMap. |
| get() | Retrieves the value associated with a specific key. |
| containsKey() | Checks if the ConcurrentHashMap contains a specific key. |
| containsValue() | Checks if the ConcurrentHashMap contains a specific value. |
| remove() | Removes the key-value pair for a specific key. |
| size() | Returns the number of key-value pairs in the ConcurrentHashMap. |
| isEmpty() | Checks if the ConcurrentHashMap is empty. |
| keySet() | Returns a set view of the keys contained in the ConcurrentHashMap. |
| values() | Returns a collection view of the values contained in the ConcurrentHashMap. |
| putIfAbsent() | Adds a key-value pair if the key is not already present in the ConcurrentHashMap. |
| replace() | Replaces the value for a specific key only if it is already mapped to a value. |
| forEach() | Performs the given action for each key-value pair in the ConcurrentHashMap. |
| keys() | Returns an enumeration of the keys contained in the ConcurrentHashMap. |
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