Java设计模式---备忘录模式--简单案例--象棋“悔棋”的实现

Bertha 。 2024-03-17 10:03 39阅读 0赞

## Java设计模式---备忘录模式--简单案例--象棋“悔棋”的实现 ##

### 代码： ###

package li.shen;
    
    /**
     * 象棋实体类
     */
    public class ChessGrame {
        private String label; //棋子名称
        private int x;//横坐标
        private int y;//纵坐标
    
        public ChessGrame() {
        }
    
        public  ChessMemento createMemento(){
            return new ChessMemento(label,x,y);
        }
        public ChessGrame(String label, int x, int y) {
            this.label = label;
            this.x = x;
            this.y = y;
        }
        public void setMemento(ChessMemento createMemento){
            this.label=createMemento.getLabel();
            this.x=createMemento.getX();
            this.y=createMemento.getY();
        }
    
        public String getLabel() {
            return label;
        }
    
        public void setLabel(String label) {
            this.label = label;
        }
    
        public int getX() {
            return x;
        }
    
        public void setX(int x) {
            this.x = x;
        }
    
        public int getY() {
            return y;
        }
    
        public void setY(int y) {
            this.y = y;
        }
    
        @Override
        public String toString() {
            return this.label+"的位置：{" +
                    "x=" + x +
                    ", y=" + y +
                    '}';
        }
    }

package li.shen;
    
    /**
     * 象棋备忘录类
     *  用于保存象棋的状态信息
     */
    public class ChessMemento {
        private String label; //棋子名称
        private int x;//横坐标
        private int y;//纵坐标
    
        public ChessMemento() {
        }
    
        public ChessMemento(String label, int x, int y) {
            this.label = label;
            this.x = x;
            this.y = y;
        }
    
        public String getLabel() {
            return label;
        }
    
        public void setLabel(String label) {
            this.label = label;
        }
    
        public int getX() {
            return x;
        }
    
        public void setX(int x) {
            this.x = x;
        }
    
        public int getY() {
            return y;
        }
    
        public void setY(int y) {
            this.y = y;
        }
    }

package li.shen;
    
    /**
     *  管理备忘录 类
     */
    public class MementoCaretaker {
        private ChessMemento chessMemento;
    
        public ChessMemento getChessMemento() {
            return chessMemento;
        }
    
        public void setChessMemento(ChessMemento chessMemento) {
            this.chessMemento = chessMemento;
        }
    }

package li.shen;
    
    /**
     * 测试类
     */
    public class Test {
        public static void main(String[] args) {
    
            ChessGrame chessGrame=new ChessGrame("车", 3, 1);
            System.out.println(chessGrame.getLabel()+"的初始位置-->" + chessGrame);
            MementoCaretaker mementoCaretaker = new MementoCaretaker();
            mementoCaretaker.setChessMemento(chessGrame.createMemento());
            chessGrame.setX(3);
            chessGrame.setY(3);
            System.out.println("走了一步后-->" + chessGrame);
            chessGrame.setMemento(mementoCaretaker.getChessMemento());
            System.out.println("悔棋后-->" + chessGrame);
        }
    }

### 运行结果： ###

![930d0a9ae592457d995c882c70d1c854.png][]

[930d0a9ae592457d995c882c70d1c854.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/17/b301e2c56c3b48908baab293878eab8c.png