8000 备忘录模式 · Folgerjun/DesignPatterns-Java@faba2e2 · GitHub
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备忘录模式
备忘录模式
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‎java-des/src/com/java/design/memento/Caretaker.java

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package com.java.design.memento;
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/**
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* 用于保存
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*
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* @author Administrator
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*
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*/
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public class Caretaker {
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private Memento memento;
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public Memento getMemento() {
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return memento;
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}
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public void setMemento(Memento memento) {
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this.memento = memento;
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}
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}

‎java-des/src/com/java/design/memento/Memento.java

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package com.java.design.memento;
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public class Memento {
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private String state;
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public Memento(String state) {
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this.state = state;
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}
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public String getState() {
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return state;
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}
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public void setState(String state) {
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this.state = state;
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}
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}

‎java-des/src/com/java/design/memento/MementoPattern.java

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package com.java.design.memento;
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/**
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* 备忘录模式 -----> 在不破坏封闭的前提下，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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*
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* @author Administrator
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*
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*/
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public class MementoPattern {
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public static void main(String[] args) {
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Originator originator = new Originator();
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originator.setState("在洗澡 ...");
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originator.showState();
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// 状态进行保存
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Caretaker caretaker = new Caretaker();
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caretaker.setMemento(originator.createMemento());
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originator.setState("在吃饭 ...");
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originator.showState();
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// 重新将状态拿出来
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originator.setMemento(caretaker.getMemento());
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originator.showState();
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}
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}

‎java-des/src/com/java/design/memento/Originator.java

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package com.java.design.memento;
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public class Originator {
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private String state;
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public String getState() {
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return state;
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}
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public void setState(String state) {
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this.state = state;
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}
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public Memento createMemento() {
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return new Memento(state);
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}
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public void setMemento(Memento memento) {
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state = memento.getState();
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}
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public void showState() {
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System.out.println(state);
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}
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}

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