浅谈JAVA设计模式之——备忘录模式（Memento）

package com.lyz.design.memento;
/**
 * Memento 
 * @author binghe
 *
 */
public class Caretaker {
    private Memento memento;
    public Memento getMemento(){
        return this.memento;
    }
    public void setMemento(Memento memento){
        this.memento = memento;
    }
}

package com.lyz.design.memento;
/**
 * Originator 
 * @author binghe
 *
 */
public class Memento {
    private String state;
    public Memento(String state) {
        this.state = state;
    }
    public String getState() {
        return state;
    }
    public void setState(String state) {
        this.state = state;
    }
}

package com.lyz.design.memento;
/**
 * Caretaker 
 * @author binghe
 *
 */
public class Originator {
    private String state;
    public String getState() {
        return state;
    }
    public void setState(String state) {
        this.state = state;
    }
    public Memento createMemento() {
        return new Memento(state);
    }
    public void setMemento(Memento memento) {
        state = memento.getState();
    }
    public void showState(){
        System.out.println(state);
    }
}

package com.lyz.design.memento;
/**
 * Test 
 * @author binghe
 *
 */
public class Test {
    public static void main(String[] args) {
        Originator org = new Originator();
        org.setState("开会中");
        Caretaker ctk = new Caretaker();
        ctk.setMemento(org.createMemento());//将数据封装在Caretaker
        org.setState("睡觉中");
        org.showState();//显示
        org.setMemento(ctk.getMemento());//将数据重新导入
        org.showState();
    }
}