The EnumSet class in Java is a specialized set implementation that is used with enum type keys. This class provides a way to work with enum constants efficiently. Since enums are constant and finite, EnumSet leverages this to offer better performance compared to general-purpose set implementations like HashSet.
This guide covers various methods available in the EnumSet 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 set, making it a valuable tool for managing collections of enum constants.
For more detailed information, please refer to the official Java SE Documentation and additional resources on Java Collections Tutorial. Also, check out this comprehensive EnumSet Tutorial for more examples and usage scenarios.
Java EnumSet Class Methods
The table below contains various methods of the Java EnumSet 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 |
|---|---|
| allOf() | Creates an enum set with all of the elements of the specified enum type. |
| noneOf() | Creates an empty enum set with the specified element type. |
| of() | Creates an enum set initially containing the specified elements. |
| complementOf() | Creates an enum set with all of the elements that are not contained in the specified enum set. |
| copyOf() | Creates an enum set with the same elements as the specified collection. |
| add() | Adds the specified element to the set. |
| addAll() | Adds all of the elements in the specified collection to the set. |
| contains() | Returns true if the set contains the specified element. |
| containsAll() | Returns true if the set contains all of the elements in the specified collection. |
| remove() | Removes the specified element from the set if it is present. |
| removeAll() | Removes from the set all of its elements that are contained in the specified collection. |
| retainAll() | Retains only the elements in the set that are contained in the specified collection. |
| clear() | Removes all of the elements from the set. |
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