设计模式之备忘录(memento)

?

public class Memento {public static void main(String[] args){AnOriginator ao = new AnOriginator();ao.setA("5");ao.setB("c");AMemento am = ao.getAMemento();ao.setA("3");ao.setB("i");System.out.println(ao.getA()+ao.getB());System.out.println(am.getA()+am.getB());}}class AnOriginator{private String a;private String b;public AMemento getAMemento(){return new AMemento(this);}public String getA() {return a;}public void setA(String a) {this.a = a;}public String getB() {return b;}public void setB(String b) {this.b = b;}}class AMemento{private String a;private String b;public AMemento(AnOriginator anOriginator){this.a = anOriginator.getA();this.b = anOriginator.getB();}public String getA() {return a;}public void setA(String a) {this.a = a;}public String getB() {return b;}public void setB(String b) {this.b = b;}}//http://zuoqiang.iteye.com/blog/744024