메멘토패턴 2부 패턴적용하기

2022-07-10-메멘토패턴-2부-패턴적용하기

목차

01.메멘토 패턴 적용하기

01.1 Game 코드 변경

01.2 Client 코드 변경

01.메멘토 패턴 적용하기

• Client를 careTaker로쓰기

• memento역할이 중요 상태를 저장할것은

  • GameSave로 클래스 생성

  public final class GameSave {
  
      private final int blueTeamScore;
  
      private final int redTeamScore;
  
      public GameSave(int blueTeamScore, int redTeamScore) {
          this.blueTeamScore = blueTeamScore;
          this.redTeamScore = redTeamScore;
      }
  
      public int getBlueTeamScore() {
          return blueTeamScore;
      }
  
      public int getRedTeamScore() {
          return redTeamScore;
      }
  }

  • 상태 정보가 바뀌면 안된다 그래서 final을 사용함

01.1 Game 코드 변경

• before

  import java.io.Serializable;
  
  public class Game implements Serializable {
  
    private int redTeamScore;
  
    private int blueTeamScore;
  
    public int getRedTeamScore() {
        return redTeamScore;
    }
  
    public void setRedTeamScore(int redTeamScore) {
        this.redTeamScore = redTeamScore;
    }
  
    public int getBlueTeamScore() {
        return blueTeamScore;
    }
  
    public void setBlueTeamScore(int blueTeamScore) {
        this.blueTeamScore = blueTeamScore;
    }
  }

• after

  public class Game {
  
    private int redTeamScore;
  
    private int blueTeamScore;
  
    public int getRedTeamScore() {
        return redTeamScore;
    }
  
    public void setRedTeamScore(int redTeamScore) {
        this.redTeamScore = redTeamScore;
    }
  
    public int getBlueTeamScore() {
        return blueTeamScore;
    }
  
    public void setBlueTeamScore(int blueTeamScore) {
        this.blueTeamScore = blueTeamScore;
    }
  
    public GameSave save() {
        return new GameSave(this.blueTeamScore, this.redTeamScore);
    }
  
    public void restore(GameSave gameSave) {
        this.blueTeamScore = gameSave.getBlueTeamScore();
        this.redTeamScore = gameSave.getRedTeamScore();
    }
  
  }

  • GameSave save()
  • restore(GameSave gameSave) 추가

01.2 Client 코드 변경

• before

  public class Client {
  
    public static void main(String[] args) {
        Game game = new Game();
        game.setRedTeamScore(10);
        game.setBlueTeamScore(20);
  
        int blueTeamScore = game.getBlueTeamScore();
        int redTeamScore = game.getRedTeamScore();
  
        Game restoredGame = new Game();
        restoredGame.setBlueTeamScore(blueTeamScore);
        restoredGame.setRedTeamScore(redTeamScore);
    }
  }

• after

  public class Client {
  
    public static void main(String[] args) {
        Game game = new Game();
        game.setBlueTeamScore(10);
        game.setRedTeamScore(20);
  
        GameSave save = game.save();
  
        game.setBlueTeamScore(12);
        game.setRedTeamScore(22);
  
        game.restore(save);
        System.out.println(game.getBlueTeamScore());
        System.out.println(game.getRedTeamScore());
    }
  }