자바의 정석 - 열거형(Enums)

enum 열거형이름 { 상수명1, 상수명2, ...}

  void move() {
    switch(dir) {
        case EAST: x++; //Direction.EAST라고 쓰면 안된다.(열거형 이름 없이 상수 이름만 적어야 한다.)
          break;
        case WEST: x--;
          break;
        case SOUTH: y++;
          break;
        case NORTH: y--;
          break;
    }
  }

enum Direction { EAST, WEST, SOUTH, NORTH }

class Direction {
  static final Direction EAST = new Direction("EAST");
  static final Direction WEST = new Direction("WEST");
  static final Direction SOUTH = new Direction("SOUTH");
  static final Direction NORTH = new Direction("NORTH");
  
  private String name;
  
  private Direction(String name)  {
    this.name = name;
  }
}