The EnumMap class in Java is a specialized map implementation that is used with enum type keys. This class provides a way to map enum constants to values efficiently. Since enums are constant and finite, EnumMap leverages this to offer better performance compared to general-purpose map implementations like HashMap.
This guide covers various methods available in the EnumMap 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 with enum keys.
For more detailed information, please refer to the official Java SE Documentation and additional resources on Java Collections Tutorial. Also, check out this comprehensive EnumMap Tutorial for more examples and usage scenarios.
Java EnumMap Class Methods
The table below contains various methods of the Java EnumMap 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. |
| get() | Returns the value to which the specified key is mapped. |
| containsKey() | Returns true if the map contains the specified key. |
| 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. |
| values() | Returns a collection view of the values contained in the map. |
| entrySet() | Returns a set view of the key-value mappings contained in the map. |
| forEach() | Performs the given action for each entry in the map. |
| getOrDefault() | Returns the value to which the specified key is mapped, or the default value if the map contains no mapping for the key. |
| putIfAbsent() | Adds the specified key-value pair to the map if the key is not already associated with a value. |
| remove() | Removes the specified key from the map if it is present. |
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