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Enums

An enum is a special "class" that represents a group of constants (unchangeable variables, like final variables).

To create an enum, use the enum keyword (instead of class or interface), and separate the constants with a comma. Note that they should be in uppercase letters:

Example

enum Level {

  LOW,

  MEDIUM,

  HIGH

}

You can access enum constants with the dot syntax:

Level myVar = Level.MEDIUM;

Enum is short for "enumerations", which means "specifically listed".

Enum inside a Class

You can also have an enum inside a class:

Example

public class Main {

  enum Level {

    LOW,

    MEDIUM,

    HIGH

  }

 

  public static void main(String[] args) {

    Level myVar = Level.MEDIUM;

    System.out.println(myVar);

  }

}

The output will be:

MEDIUM

Enum in a Switch Statement

Enums are often used in switch statements to check for corresponding values:

Example

enum Level {

  LOW,

  MEDIUM,

  HIGH

}

 

public class Main {

  public static void main(String[] args) {

    Level myVar = Level.MEDIUM;

 

    switch(myVar) {

      case LOW:

        System.out.println("Low level");

        break;

      case MEDIUM:

         System.out.println("Medium level");

        break;

      case HIGH:

        System.out.println

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