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The IdentityHashMap class in Java is a specialized map implementation that uses reference equality when comparing keys and values. This class provides a way to map keys to values based on their identity rather than their equality. It is particularly useful when you need to ensure that keys are compared by their memory reference, not by the value they represent.
This guide covers various methods available in the IdentityHashMap 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 accessing elements in the map, making it a valuable tool for managing mappings based on object identity.
For more detailed information, please refer to the official Java SE Documentation and additional resources on Java Collections Tutorial. Also, check out this comprehensive IdentityHashMap Tutorial for more examples and usage scenarios.
Java IdentityHashMap Class Methods
The table below contains various methods of the Java IdentityHashMap 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 the specified key-value pair to the map. |
| putAll() | Adds all of the key-value pairs from the specified map to this map. |
| get() | Returns the value to which the specified key is mapped. |
| containsKey() | Returns true if the map contains the specified key. |
| containsValue() | Returns true if the map contains the specified value. |
| entrySet() | Returns a set view of the key-value mappings contained in the map. |
| values() | Returns a collection view of the values contained in the map. |
| size() | Returns the number of key-value mappings in the map. |
| isEmpty() | Returns true if the map contains no key-value mappings. |
| keySet() | Returns a set view of the keys contained in the map. |
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