In Java 12, the switch statement will be extended to allow expression to control the behaviour and the flow of the switch statement. As a result, it will simplify your coding.

Let's have an example to illustrate the new switch expressions. Here is an example of the old way to write the switch statement:

switch (day) {
    case MON:
    case TUE:
    case WED:
    case THU:
    case FRI:
        System.out.println("Weekday");
        break;
    case SAT:
    case SUN:
        System.out.println("Weekend");
        break;
}

The above switch can be rewritten using switch expression as follow:

switch (day) {
    case MON, TUE, WED, THU, FRI    -> System.out.println("Weekday");
    case SAT, SUN                   -> System.out.println("Weekend");
}

As you can see, the new code is shorter, simplier and easy to read. Learn more about switch expression here.

Reference

• https://openjdk.java.net/jeps/325
• https://openjdk.java.net/projects/jdk/12/