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Commit 25a363d

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author
deeper
committed
add memento
1 parent d64c9da commit 25a363d

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4 files changed

+100
-0
lines changed

4 files changed

+100
-0
lines changed

‎src/com/ruoxu/pattern/memento/CF.java

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package com.ruoxu.pattern.memento;
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/**
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* 穿越火线
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*/
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public class CF {
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private int mCheckPoint = 1;
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private int mLifeValue = 100;
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private String mWeapon = "沙漠之鹰";
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public void play(){
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System.out.println("玩游戏 :"+String.format("第 %d 关", mCheckPoint) + "奋战杀敌中");
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mLifeValue -= 10;
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System.out.println("进度升级了");
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mCheckPoint ++;
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System.out.println("到达 "+ String.format("第%d关", mCheckPoint));
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}
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// 退出游戏
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public void quit(){
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System.out.println("========");
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System.out.println("退出前的游戏属性 :"+ this.toString());
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System.out.println("quit");
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System.out.println("========");
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}
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public Memento createMemoto(){
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Memento memoto = new Memento();
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memoto.mCheckPoint = mCheckPoint;
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memoto.mLifeValue = mLifeValue;
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memoto.mWeapon = mWeapon;
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return memoto;
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}
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// 恢复游戏
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public void restore(Memento memoto){
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this.mCheckPoint = memoto.mCheckPoint;
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this.mLifeValue = memoto.mLifeValue;
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this.mWeapon = memoto.mWeapon;
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System.out.println("恢复后的游戏属性:"+this.toString());
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}
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@Override
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public String toString() {
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return "CF [mCheckPoint=" + mCheckPoint + ", mLifeValue=" + mLifeValue + ", mWeapon=" + mWeapon + "]";
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}
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}
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package com.ruoxu.pattern.memento;
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public class Caretaker {
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Memento mMemoto; // 备忘录
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/**
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* 存档
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*/
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public void archive(Memento memoto){
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this.mMemoto = memoto;
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}
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/**
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* 获取存档
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*/
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public Memento getMemoto(){
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return mMemoto;
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}
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}

‎src/com/ruoxu/pattern/memento/Demo.java

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package com.ruoxu.pattern.memento;
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/**
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* 备忘录模式
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* 定义:在不破坏封装的前提下,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。
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* 使用场景:
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* 1.需要保存一个对象在某一时刻的状态或部分状态
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* 2.如果用一个接口来让其他对象得到这些状态,将会暴露对象的实现细节并破坏对象的封装性,一个对象不希望外界直接访问其内部状态,通过中间对象可以间接访问其内部状态。
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*/
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public class Demo {
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public static void main(String[] args) {
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CF cf = new CF();
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cf.play();
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// 游戏存档
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Caretaker caretaker = new Caretaker();
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caretaker.archive(cf.createMemoto());
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cf.quit();
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// 恢复游戏
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CF newGame = new CF();
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newGame.restore(caretaker.getMemoto());
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}
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}
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package com.ruoxu.pattern.memento;
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public class Memento {
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public int mCheckPoint;
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public int mLifeValue;
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public String mWeapon;
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@Override
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public String toString() {
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return "Memoto [mCheckPoint=" + mCheckPoint + ", mLifeValue=" + mLifeValue + ", mWeapon=" + mWeapon + "]";
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}
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}

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