StrategyPattern

package StrategyPattern; public class Hand { public static final int HANDVALUE_GUU = 0;//表示石头 public static final int HANDVALUE_CHO = 1;//表示剪刀的值 public static final int HANDVALU_PAA = 2;//表示布的值 public static final Hand[] hand={ //表示猜拳首饰的3个实例对象 new Hand(0), new Hand(1), new Hand(2), }; private static final String[] name = { "石头","剪刀","布", }; private int handvalue; private Hand(int handvalue){ this.handvalue = handvalue; } public static Hand getHand(int handvalue){ return hand[handvalue]; } public boolean isStrongerThan(Hand h){ return fight(h) == 1; } public boolean isWeakerThan(Hand h){ return fight(h) == -1; } private int fight(Hand h){ //平手为0，this胜出为1，this告负为-1 if(this == h){ return 0; }else if((this.handvalue +1)%3 == h.handvalue){ return 1; }else{ return -1; } } public String toString(){ return name[this.handvalue]; } } package StrategyPattern; public class Main { public static void main(String[] args){ args = new String[]{"1","2"}; if(args.length != 2){ System.exit(0); } int seed1 = Integer.parseInt(args[0]); int seed2 = Integer.parseInt(args[1]); Player player1 = new Player("Taro",new WinningStrategy(seed1)); Player player2 = new Player("Hana",new WinningStrategy(seed2)); for(int i=0; i < 10000;i++){ Hand nextHand1 = player1.nextHand(); Hand nextHand2 = player2.nextHand(); if(nextHand1.isStrongerThan(nextHand2)){ System.out.println("Winner" +player1); player1.win(); player2.lose(); }else if(nextHand2.isStrongerThan(nextHand1)){ System.out.println("Winner" +player2); player2.win(); player1.lose(); }else{ System.out.println("Even..."); player1.even(); player2.even(); } } System.out.println("Total result"); System.out.println(""+player1); System.out.println(""+player2); } } package StrategyPattern; public class Player { private String name; private Strategy strategy; private int wincount; private int losecount; private int gamecount; public Player(String name,Strategy strategy){ this.name = name; this.strategy = strategy; } public Hand nextHand(){ return strategy.nextHand(); } public void win(){ strategy.study(true); this.wincount++; this.gamecount++; } public void lose(){ strategy.study(false); losecount++; gamecount++; } public void even(){ gamecount++; } public String toString(){ return "["+name+":"+gamecount+"games," +wincount+"win,"+losecount+"lose"+"]"; } } package StrategyPattern; import java.util.Random; public class ProbStrategy implements Strategy { private Random random; private int prevHandValue = 0; private int currentHandValue = 0; private int[][] history = { {1,1,1,}, {1,1,1,}, {1,1,1,}, }; public ProbStrategy(int seed){ random = new Random(seed); } public Hand nextHand(){ int bet = random.nextInt(getSum(currentHandValue)); int handvalue = 0; if(bet < history[currentHandValue][0]){ handvalue = 0; }else if(bet > history[currentHandValue][0]){ handvalue = 1; }else { handvalue = 2; } this.prevHandValue = currentHandValue; currentHandValue = handvalue; return Hand.getHand(handvalue); } private int getSum(int hv){ int sum = 0; for(int i=0;i<3;i++){ sum += history[hv][i]; } return sum; } public void study(boolean win){ if(win){ history[prevHandValue][currentHandValue]++; }else{ history[prevHandValue][(currentHandValue+1)%3]++; history[prevHandValue][(currentHandValue+2)%3]++; } } } package StrategyPattern; public interface Strategy { public abstract Hand nextHand();//取得下一次出手招式的方法 public abstract void study(boolean win);//前一次出手的手势赢则study（true），否则study(false) } package StrategyPattern; import java.util.Random; public class WinningStrategy implements Strategy{ //如果上一次赢了，接下来就继续出同样的手势，如果上一次输了，接下来的手势要使用随机数决定 private Random random; private boolean won = false; private Hand prevHand; public WinningStrategy(int seed){ random = new Random(seed); } public Hand nextHand(){ if(!won){ prevHand = Hand.getHand(random.nextInt(3)); } return prevHand; } public void study(boolean win){ won = win; } }