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This article explains how to use enum in Java . We will use statement switchwith enum in two ways .switch

In Java, we use traditional switch and case to perform enumeration operations.switch

In this example, we SwitchEnumcreate an enumeration in the class and name it Days. It has seven constants, which are the days of the week. We use the switch and case methods to display a different message for each day.

We get the value from the enumeration using the name of the constant, like Days.MONDAYwill get the constant MONDAY, which will be stored dayin the enumeration object. We can use it to switch different cases. switch()gets the value to switch, that is day. Finally, we specify each case and the output it should produce.

We have to switchbreak each case in so that it interrupts execution once it completes.

public class SwitchEnum {
  enum Days { SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY }

  public static void main(String[] args) {
    Days day = Days.MONDAY;

    switch (day) {
      case SUNDAY:
        System.out.println("Sundays are wonderful");
        break;

      case MONDAY:
        System.out.println("Mondays are boring");
        break;

      case TUESDAY:
        System.out.println("Tuesdays are OK");
        break;

      case WEDNESDAY:
        System.out.println("Wednesdays are tiring");
        break;

      case THURSDAY:
        System.out.println("Thursdays are even more boring");
        break;

      case FRIDAY:
        System.out.println("Fridays means work work and work");
        break;

      case SATURDAY:
        System.out.println("Saturdays makes everybody happy");
        break;
    }
  }
}

Output:

Mondays are boring

Using enhanced switch and case in Java 12 to switchoperate on Enum

In Java 12, enhanced switch and case are introduced to overcome the shortcomings of traditional switch and case. The biggest disadvantage of the traditional switch statement is that we have to specify the break keyword in each case.

Now with the enhanced switch and case, we can use enumerations in a shorter code. In the new switch and case, we use arrows instead of colons. Since we only want to print one statement, we don't have to use any braces.

public class SwitchEnum {
  enum Days { SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY }

  public static void main(String[] args) {
    Days day = Days.SATURDAY;

    switch (day) {
            case SUNDAY -> System.out.println("Sundays are wonderful");
            case MONDAY -> System.out.println("Mondays are boring");
            case TUESDAY -> System.out.println("Tuesdays are OK");
            case WEDNESDAY -> System.out.println("Wednesdays are tiring");
            case THURSDAY -> System.out.println("Thursdays are even more boring");
            case FRIDAY -> System.out.println("Fridays means work work and work");
            case SATURDAY -> System.out.println("Saturdays makes everybody happy");
        }

    }
}

Output:

Saturdays makes everybody happy