剪刀石头布游戏

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1. 游戏结果

package cn.yjq.game;public enum Outcome {//赢，输，平WIN, LOSE, DRAW;}

2. 游戏Item

package cn.yjq.game;import static cn.yjq.game.Outcome.*;public interface Item {Outcome compete(Item it);Outcome eval(Paper p);Outcome eval(Scissors s);Outcome eval(Rock r);}class Paper implements Item {   //布public Outcome compete(Item it) { return it.eval(this); }public Outcome eval(Paper p) { return DRAW; }public Outcome eval(Scissors s) { return WIN; }public Outcome eval(Rock r) { return LOSE; }public String toString() { return "Paper"; }}class Scissors implements Item {   //剪刀public Outcome compete(Item it) { return it.eval(this); }public Outcome eval(Paper p) { return LOSE; }public Outcome eval(Scissors s) { return DRAW; }public Outcome eval(Rock r) { return WIN; }public String toString() { return "Scissors"; }}class Rock implements Item {   //石头public Outcome compete(Item it) { return it.eval(this); }public Outcome eval(Paper p) { return WIN; }public Outcome eval(Scissors s) { return LOSE; }public Outcome eval(Rock r) { return DRAW; }public String toString() { return "Rock"; }}

3. 游戏机

package cn.yjq.game;import java.util.Random;public class Game {static final int SIZE = 10;static final Random random = new Random(47);public static Item newItem() {switch(random.nextInt(3)) {default :case 1 : return new Paper();case 2 : return new Scissors();case 3 : return new Rock();}}public static void match(Item a, Item b) {System.out.println(a + " VS " + b + " : " + a.compete(b));}public static void main(String[] args) {for(int i=0; i<SIZE; i++) {match(newItem(), newItem());}}}

//outputScissors VS Scissors : DRAWPaper VS Scissors : LOSEPaper VS Scissors : LOSEPaper VS Scissors : LOSEPaper VS Paper : DRAWPaper VS Paper : DRAWPaper VS Paper : DRAWScissors VS Paper : WINPaper VS Paper : DRAWScissors VS Paper : WIN

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