Java Enum Methods - return opposite direction enum

Question

I would like to declare an enum Direction, that has a method that returns the opposite direction (the following is not syntactically correct, i.e, enums cannot be instantiat

Answer 1

This works:

public enum Direction {
    NORTH, SOUTH, EAST, WEST;

    public Direction oppose() {
        switch(this) {
            case NORTH: return SOUTH;
            case SOUTH: return NORTH;
            case EAST:  return WEST;
            case WEST:  return EAST;
        }
        throw new RuntimeException("Case not implemented");
    }
}