qa7230238 rock paper scissors じゃんけん

import java.util.*;
public class QA7230238 {
  private enum Hand {
    Rock("グー"), Paper("パー"), Scissors("チョキ");
    private String getLocale() {
      return this.locale;
    }
    private void setLocale(String locale) {
      this.locale = locale;
    }
    private String locale;
    Hand(String locale) {
      this.setLocale(locale);
    }
  }
  private enum Player {
    Human, Computer
  }
  private enum Result {
    Win, Throw, Lose
  }
  private static Hand hand(String s) {
    Hand ret = null;
    switch (s) {
      case "r":
        ret = Hand.Rock;
        break;
      case "p":
        ret = Hand.Paper;
        break;
      case "s":
        ret = Hand.Scissors;
        break;
      default:
        System.exit(1);
    }
    return ret;
  }
  private static Hand hand(int i) {
    Hand ret = null;
    switch (i) {
      case 0:
        ret = Hand.Rock;
        break;
      case 1:
        ret = Hand.Paper;
        break;
      case 2:
        ret = Hand.Scissors;
        break;
      default:
        System.exit(1);
    }
    return ret;
  }
  private static Result result(Hand a, Hand b) {
    if (a == Hand.Rock && b == Hand.Paper) { return Result.Lose; }
    if (a == Hand.Rock && b == Hand.Scissors) { return Result.Win; }
    if (a == Hand.Paper && b == Hand.Rock) { return Result.Win; }
    if (a == Hand.Paper && b == Hand.Scissors) { return Result.Lose; }
    if (a == Hand.Scissors && b == Hand.Rock) { return Result.Lose; }
    if (a == Hand.Scissors && b == Hand.Paper) { return Result.Win; }
    return Result.Throw;
  }
  public static void main(String[] args) {
    int games = 3;
    Scanner in = new Scanner(System.in);
    Map<Player, ArrayList<Hand>> game = new EnumMap<Player, ArrayList<Hand>>(
        Player.class);
    game.put(Player.Human, new ArrayList<Hand>());
    game.put(Player.Computer, new ArrayList<Hand>());
    Random rand = new Random();
    for (int i = 0; i < games; i++) {
      System.out.print("Choose (r)ock (p)aper (s)cissors ? ");
      game.get(Player.Human).add(hand(in.nextLine()));
      game.get(Player.Computer).add(hand(rand.nextInt(3)));
    }
    in.close();
    StringBuilder sb = new StringBuilder();
    sb.append(Player.Human.name() + " vs " + Player.Computer.name() + "\n");
    for (int i = 0; i < games; i++) {
      Hand human = game.get(Player.Human).get(i);
      Hand computer = game.get(Player.Computer).get(i);
      sb.append(human.getLocale() + " vs ");
      sb.append(computer.getLocale() + " --> ");
      sb.append(result(human, computer).name() + "\n");
    }
    System.out.print(sb);
  }
}