Syntax

switch(VARIABLE) {
	case MATCH_1 [, MATCH_2][, MATCH_N] -> EXPRESSION; | THROW-STATEMENT; | BLOCK
	default -> EXPRESSION; | THROW-STATEMENT; | BLOCK
}
Token Description
VARIABLE The variable to test.
MATCH_1, MATCH_2, MATCH_N The value or values that can match the VARIABLE.
EXPRESSION A expression to execute.
THROW-STATEMENT A expression that throws an exception.
BLOCK A block of statements to execute.

If a return value is required use the yield keyword instead of return.

Example

public enum Day { 
	SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY; 
}

Day day = Day.WEDNESDAY;

int numLetters = switch (day) {
    case MONDAY, FRIDAY, SUNDAY -> 6;
    case TUESDAY -> 7;
    case THURSDAY, SATURDAY -> {
        System.out.println(8);
        yield 8;
    }
    case WEDNESDAY -> {
        System.out.println(9);
        yield 9;
    }
    default -> {
        throw new IllegalStateException("Invalid day: " + day);
    }
};

System.out.println(numLetters);