大话设计模式 访问者模式

package org.ustc.visitor;public abstract class Action {public String name;public Action(String name) {super();this.name = name;}public String getName() {return name;}public void setName(String name) {this.name = name;}abstract void getManConclusion(Man man);abstract void getWomanConclusion(Woman woman);}

package org.ustc.visitor;public abstract class Person {public String name;public Person(String name) {super();this.name = name;}public String getName() {return name;}public void setName(String name) {this.name = name;}abstract void Accept(Action visitor);}

package org.ustc.visitor;public class Failing extends Action {public Failing(String name) {super(name);// TODO Auto-generated constructor stub}@Overridevoid getManConclusion(Man man) {// TODO Auto-generated method stubSystem.out.println(man.getName()+this.getName()+"时，闷头喝酒，谁也不用劝");}@Overridevoid getWomanConclusion(Woman woman) {// TODO Auto-generated method stubSystem.out.println(woman.getName()+this.getName()+"时，眼泪汪汪，谁劝不了");}}

package org.ustc.visitor;public class Success extends Action {public Success(String name) {super(name);// TODO Auto-generated constructor stub}@Overridevoid getManConclusion(Man man) {// TODO Auto-generated method stubSystem.out.println(man.getName()+this.getName()+"时，背后多半有一个伟大的女人");}@Overridevoid getWomanConclusion(Woman woman) {// TODO Auto-generated method stubSystem.out.println(woman.getName()+this.getName()+"时多半有一个不成功的男人");}}

package org.ustc.visitor;public class Man extends Person{public Man(String name) {super(name);// TODO Auto-generated constructor stub}@Overridepublic void Accept(Action visitor) {// TODO Auto-generated method stubvisitor.getManConclusion(this);}}

package org.ustc.visitor;public class Woman extends Person {public Woman(String name) {super(name);// TODO Auto-generated constructor stub}@Overridepublic void Accept(Action visitor) {// TODO Auto-generated method stubvisitor.getWomanConclusion(this);}}

package org.ustc.visitor;import java.util.ArrayList;import java.util.List;public class DisplayObject {private List<Person> list;public DisplayObject() {list = new ArrayList<Person>();}public void attach(Person p){list.add(p);}public void detach(Person p){list.remove(p);}public void display(Action visitor){for(Person p:list)p.Accept(visitor);}}

package org.ustc.visitor;public class Main {/** * @param args */public static void main(String[] args) {// TODO Auto-generated method stubDisplayObject obj = new DisplayObject();obj.attach(new Man("男人"));obj.attach(new Woman("女人"));Success v1 = new Success("成功");obj.display(v1);Failing v2  = new Failing("失败");obj.display(v2);}}