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anxppanxpp
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访问者模式
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‎src/com/anxpp/designpattern/visitor/APPOwner.java‎

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package com.anxpp.designpattern.visitor;
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//具体访问者
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public class APPOwner implements Visitor{
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@Override
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public void visit(UserVIP user) {
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String estimation = user.getEstimation();
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if(estimation.length()>5)
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System.out.println("记录一条有效反馈：" + estimation);
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}
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@Override
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public void visit(UserOrdinary user) {
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String estimation = user.getEstimation();
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if(estimation.length()>10)
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System.out.println("记录一条有效反馈：" + estimation);
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}
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}

‎src/com/anxpp/designpattern/visitor/Dispatch.java‎

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package com.anxpp.designpattern.visitor;
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//演示java的静态分派和动态分派
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//结果会输出：Collection
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//所以重载的分派是根据静态类型进行的
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public class Dispatch {
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void print(FatherClass c){
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System.out.print("父类");
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}
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void print(ChildClass c){
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System.out.print("子类");
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}
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public static void main(String args[]){
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FatherClass child = new ChildClass();
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new Dispatch().print(child);
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child.print();
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}
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}
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class FatherClass{
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void print(){
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System.out.println("父类");
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}
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}
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class ChildClass extends FatherClass{
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void print(){
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System.out.print("子类");
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}
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}

‎src/com/anxpp/designpattern/visitor/MultiDispatch.java‎

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package com.anxpp.designpattern.visitor;
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public class MultiDispatch {
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public static void main(String args[]){
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Father child = new Child();
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child.print();
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new Child().print(new Vistor());
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}
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}
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class Father{
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void print(){
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System.out.println("父类");
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}
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}
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class Child extends Father{
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void print(){
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System.out.print("子类");
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}
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void print(Vistor c){
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c.print(this);
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}
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}
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class Vistor {
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public void print(Child child){
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child.print();
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}
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}

‎src/com/anxpp/designpattern/visitor/TestUse.java‎

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package com.anxpp.designpattern.visitor;
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import java.util.ArrayList;
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import java.util.Iterator;
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public class TestUse {
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public static void main(String args[]){
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Visitor appOwner = new APPOwner();
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ArrayList<User> users = new ArrayList<User>();
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users.add(new UserOrdinary("普通用户短反馈"));
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users.add(new UserOrdinary("这是一个普通用户的比较长的反馈"));
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users.add(new UserVIP("VIP用户的短反馈"));
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users.add(new UserVIP("VIP用户的比较长的反馈反馈"));
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Iterator<User> iterator = users.iterator();
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while(iterator.hasNext()){
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iterator.next().accept(appOwner);
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}
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}
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}

‎src/com/anxpp/designpattern/visitor/User.java‎

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package com.anxpp.designpattern.visitor;
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//抽象元素
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public interface User {
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void accept(Visitor visitor);
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}

‎src/com/anxpp/designpattern/visitor/UserOrdinary.java‎

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package com.anxpp.designpattern.visitor;
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//普通用户，具体元素
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public class UserOrdinary implements User{
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String estimation;
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public UserOrdinary(String estimation){
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this.estimation = estimation;
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}
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@Override
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public void accept(Visitor visitor) {
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visitor.visit(this);
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}
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String getEstimation(){
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return estimation;
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}
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}

‎src/com/anxpp/designpattern/visitor/UserVIP.java‎

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package com.anxpp.designpattern.visitor;
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//VIP用户，具体元素
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public class UserVIP implements User{
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String estimation;
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public UserVIP(String estimation){
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this.estimation = estimation;
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}
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@Override
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public void accept(Visitor visitor) {
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visitor.visit(this);
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}
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String getEstimation(){
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return estimation;
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}
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}

‎src/com/anxpp/designpattern/visitor/Visitor.java‎

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package com.anxpp.designpattern.visitor;
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//抽象访问者
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public interface Visitor {
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void visit(UserVIP user);
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void visit(UserOrdinary user);
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}

‎src/com/anxpp/designpattern/visitor/package-info.java‎

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/**
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* @author Administrator
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* 访问者模式
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*/
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package com.anxpp.designpattern.visitor;

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