2022-07-10-메멘토패턴-2부-패턴적용하기

01.메멘토 패턴 적용하기

• Client를 careTaker로쓰기
• memento역할이 중요 상태를 저장할것은
  • GameSave로 클래스 생성
    • 상태 정보가 바뀌면 안된다 그래서 final을 사용함

  • 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;
        }
    }

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

• 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();
      }
  
  }

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());
      }
  }