更新时间:2022-09-07 18:08:54
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。
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); } }