完整设计模式目录见:https://blog.youkuaiyun.com/u013523089/article/details/82852049
GOF给备忘录模式的定义为:在不破坏封装性的前提下,捕获一个对象的内部状态,并在该对象之外保存这个状态。这样以后就可将该对象恢复到原先保存的状态
例:使用memento记录originator的前一个state;在变更之前将状态放到备忘录里,变更后可以读取备忘录里记录的状态用于还原
package com.zhaowd.test.designPattern.Memento.white;
public class Test {
public static void main(String[] args) {
int state = 3;
Originator originator = new Originator();
Caretaker caretaker = new Caretaker();
originator.setState(state);
/**
* 创建备忘录对象的 缓存起来
*/
caretaker.saveMemento(originator.creatMementoObject());
/*
* 进行设置重新还原
*/
originator.setState(5);
System.out.println("发起人更改状态:" + originator.getState());
originator.restoreMemento(caretaker.retrieveMemento());
// caretaker.saveMemento(originator.creatMementoObject());
//
// originator.setState(1);
// System.out.println("发起人更改状态:" + originator.getState());
//
//
// originator.restoreMemento(caretaker.retrieveMemento());
}
}