[DesignPattern - Strategy] sample1

Design Pattern - Strategy

1. 클래스다이어그램

2. Source

• Hand.java

  package com.dazzilove.strategy.sample1;
  
  public class Hand {
      public static final int HANDVALUE_GUU = 0;    //주먹
      public static final int HANDVALUE_CHO = 1;    //가위
      public static final int HANDVALUE_PAA = 2;    //보
      public static final Hand[] hand = {
          new Hand(HANDVALUE_GUU)
          , new Hand(HANDVALUE_GUU)
          , new Hand(HANDVALUE_PAA)
      };
      private static final String[] name = {
          "주먹", "가위", "보"
      };
      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;
      }
      
      /*
       * 무승부이면 0
       * this가 이기면 1
       * h가 이기면 -1
       */
      private int fight(Hand h) {
          if(this == h) {
              return 0;
          } else if((this.handValue + 1) % 3 == h.handValue) {
              return 1;
          } else {
              return -1;
          }
      }
      
      public String toString() {
          return name[handValue];
      }
  }

• Strategy.java

  package com.dazzilove.strategy.sample1;
  
  public interface Strategy {
    public abstract Hand nextHand();
    public abstract void study(boolean win);
  }

• WinningStrategy.java

  package com.dazzilove.strategy.sample1;
  
  import java.util.Random;
  
  public class WinningStrategy implements Strategy {
    private Random random;
    private boolean won = false;
    private Hand prevHand;
    
    public WinningStrategy(int seed) {
      random = new Random(seed);
    }
    
  
    @Override
    public Hand nextHand() {
      if(!won) {
        prevHand = Hand.getHand(random.nextInt(3));
      }
      return prevHand;
    }
  
    @Override
    public void study(boolean win) {
      won = win;
    }
  }

• ProbStrategy.java

  package com.dazzilove.strategy.sample1;
  
  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);
      }
  
      @Override
      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]
                  + history[currentHandValue][1]) {
              handValue = 1;
          } else {
              handValue = 2;
          }
  
          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;
      }
  
      @Override
      public void study(boolean win) {
          if (win) {
              history[prevHandValue][currentHandValue]++;
          } else {
              history[prevHandValue][(currentHandValue + 1) % 3]++;
              history[prevHandValue][(currentHandValue + 2) % 3]++;
          }
      }
  }
  

• Player.java

  package com.dazzilove.strategy.sample1;
  
  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 String getName() {
          return this.name;
      }
      
      public Hand nextHand() {
          return strategy.nextHand();
      }
      
      public void win() {
          strategy.study(true);
          winCount++;
          gameCount++;
      }
      
      public void lose() {
          strategy.study(false);
          loseCount++;
          gameCount++;
      }
      
      public void even() {
          gameCount++;
      }
      
      public String toString() {
          return "[name : " + name + ", " + gameCount + " games, " + winCount + " win, " + loseCount + " lose]";
      }
  }

• Main.java

  package com.dazzilove.strategy.sample1;
  
  public class Main {
      public static void main (String[] args) {
          if (args.length != 2) {
              System.out.println("Usage: java Main randomSeed1 randomSeed2");
              System.out.println("Example: java Main 314 15");
              System.exit(0);
          }
          
          int seed1 = Integer.parseInt(args[0]);
          int seed2 = Integer.parseInt(args[1]);
          
          Player player1 = new Player("홍길동", new WinningStrategy(seed1));
          Player player2 = new Player("임꺽정", new ProbStrategy(seed2));
          
          for (int i = 0; i < 500; i++) {
              Hand nextHand1 = player1.nextHand();
              Hand nextHand2 = player2.nextHand();
              
              System.out.println("==== " + i + "번째 가위바위보!");
              System.out.println(player1.getName() + " : " + nextHand1 + ", " + player2.getName() + " : " + nextHand2);
              
              if (nextHand1.isStrongerThan(nextHand2)) {
                  System.out.println("Winner : " + player1);
                  player1.win();
                  player2.lose();
              } else if (nextHand2.isStrongerThan(nextHand1)) {
                  System.out.println("Winner : " + player2);
                  player1.lose();
                  player2.win();
              } else {
                  System.out.println("Even....");
              }
          }
          
          System.out.println("Total result : ");
          System.out.println(" "  + player1);
          System.out.println(" " + player2);
      }
  }
  

3. 결과출력