Memento_Pattern

最新推荐文章于 2020-09-28 00:44:21 发布

原创最新推荐文章于 2020-09-28 00:44:21 发布 · 304 阅读

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#memento_pattern #design_pattern #java

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本文通过实例详细介绍了备忘录设计模式的实现原理及其在Java编程中的应用。备忘录模式允许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，这样以后就可以将该对象恢复到原先保存的状态。

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package memento_pattern;

public class Originator {
private String state;

public String getState() {
return state;
}

public void setState(String state) {
this.state = state;
}

public Memento createMemento() {//Create the memo.
return new Memento(state);
}

public void setMemento(Memento memento) {//Set the memo.
state = memento.getState();
}

public void show() {//Show the current state.
System.out.println("State = " + state);
}
}

package memento_pattern;

public class Memento {
private String state;//Record the origiantor's state.
public Memento(String state) {
this.state = state;
}
public String getState() {
return state;
}
public void setState(String state) {
this.state = state;
}
}

package memento_pattern;

public class Caretaker {
private Memento memento;//Composite the memo so that we can recovery.

public Memento getMemento() {
return memento;
}

public void setMemento(Memento memento) {
this.memento = memento;
}

}

package memento_pattern;

public class Main {
public static void main(String args[]) {
Originator o = new Originator();
o.setState("On");
o.show();

Caretaker c = new Caretaker();
c.setMemento(o.createMemento());

o.setState("Off");
o.show();

o.setMemento(c.getMemento());
o.show();
}
}
This is a general introduction to the 23 design patterns：
https://blog.youkuaiyun.com/GZHarryAnonymous/article/details/81567214