roshambo4.java

来自「Thinking in JAVA第四版源代码」· Java 代码 · 共 29 行

//: enumerated/RoShamBo4.java
package enumerated;

public enum RoShamBo4 implements Competitor<RoShamBo4> {
  ROCK {
    public Outcome compete(RoShamBo4 opponent) {
      return compete(SCISSORS, opponent);
    }
  },
  SCISSORS {
    public Outcome compete(RoShamBo4 opponent) {
      return compete(PAPER, opponent);
    }
  },
  PAPER {
    public Outcome compete(RoShamBo4 opponent) {
      return compete(ROCK, opponent);
    }
  };
  Outcome compete(RoShamBo4 loser, RoShamBo4 opponent) {
    return ((opponent == this) ? Outcome.DRAW
        : ((opponent == loser) ? Outcome.WIN
                               : Outcome.LOSE));
  }
  public static void main(String[] args) {
    RoShamBo.play(RoShamBo4.class, 20);
  }
} /* Same output as RoShamBo2.java *///:~