enum Day { SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY; }
var numberOfChar = 0;

switch(Day.MONDAY) {
    case MONDAY: case FRIDAY: case SUNDAY:
        numberOfChar = 6;
        break;
    case TUESDAY:
        numberOfChar = 7;
        break;
    case WEDNESDAY:
        numberOfChar = 9;
        break;
    case THURSDAY: case SATURDAY:
        numberOfChar = 8;
        break;
    default:
        throw new IllegalArgumentException();
}

System.out.println(numberOfChar);