合集框架实现的一对多，或多对多的实现过程

1、下面代码可以运行。一对多，一个人可以有多个Email地址：

 

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;class Person{
 private String name;
 private int age;
 
 public List allEmail;
 //这一句，是重点。
 public Person(){
    this.allEmail=new ArrayList();
 }
 
 
 public Person(String name,int age){
  this();
  this.setAge(age);
  this.setName(name); }
 
 public String getName() {
  return name;
 }
 public void setName(String name) {
  this.name = name;
 }
 public int getAge() {
  return age;
 }
 public void setAge(int age) {
  this.age = age;
 } public List getAllEmail() {
  return allEmail;
 } public void setAllEmail(List allEmail) {
  this.allEmail = allEmail;
 }
 public String toString(){
  return "名字："+this.name+"， 年龄"+this.age;
 }
}class Email{
   private String url;
   private String userName;
   private String flag;
   public Email(String url,String userName,String flag){    this.setUrl(url);
    this.setUserName(userName);
    this.setFlag(flag);
   
   }
   
 public String getUrl() {
  return url;
 }
 public void setUrl(String url) {
  this.url = url;
 }
 public String getUserName() {
  return userName;
 }
 public void setUserName(String userName) {
  this.userName = userName;
 }
 public String getFlag() {
  return flag;
 }
 public void setFlag(String flag) {
  this.flag = flag;
 }
 public String toString(){
  return "url："+this.url+"， 名字："+this.userName+", flag:"+this.flag;
 }
}public class TestJH {
 public static void main(String[] args){
  Person p=new Person("jack",25);
  
  Email e1=new Email("www.163.com","jackandlucy","@Gmail.com");
  Email e2=new Email("www.263.com","jackandlucy","@Gmail.com");
  Email e3=new Email("www.363.com","jackandlucy","@Gmail.com");
  //这一步很重要，目的是人可以得到哪些，自己的Email地址、
        p.getAllEmail().add(e1); 
        p.getAllEmail().add(e2);
        p.getAllEmail().add(e3);
        System.out.println(p+"  他有哪些Email：");
            List  all=p.getAllEmail();
            Iterator ite= all.iterator();            while(ite.hasNext()){
            Email e=(Email)ite.next();
            System.out.println(e);
             
            }
 }}

2、下面是多对多，一个学生有多个老师，一个老师有多个学生。代码可以运行。

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;class Student{
 private String name;
    public List allTea;
    
 public Student(){
  this.allTea=new ArrayList();
 }
    
 public Student(String name){
  this();
  this.name=name;
 }
 public String getName() {
  return name;
 } public void setName(String name) {
  this.name = name;
 }
 public List getAllTea(){
  return this.allTea;
 }
 public String toString(){
  return "学生的名字："+this.name;
 }
}class Teacher{
 private int sal;
 public List allStu;
 
 public Teacher(){
  this.allStu=new ArrayList();
 }
 
 public Teacher(int sal){
  this();
  this.sal=sal;
 } public int getSal() {
  return sal;
 } public void setSal(int sal) {
  this.sal = sal;
 }
 public List getStu(){
  return this.allStu;
 }
 public String toString(){
  return "老师的薪水是："+this.sal;
 }
}public class TestMoseToMose {
 public static void main(String[] args){
  Student st=new Student("jack");
  
  Teacher tc1=new Teacher(12);
  Teacher tc2=new Teacher(234);
  Teacher tc3=new Teacher(567);
  
  st.getAllTea().add(tc1);
  st.getAllTea().add(tc2);
  st.getAllTea().add(tc3);
  
  System.out.println(st+"  他有哪些老师：");
  Iterator ite1=st.getAllTea().iterator();
  while(ite1.hasNext()){
     Teacher t =(Teacher)ite1.next();
     System.out.println(t);
  }
  
  Teacher te=new Teacher(12);
  
  Student st1=new Student("jack");
  Student st2=new Student("lucy");
  Student st3=new Student("david");
  
  te.getStu().add(st1);
  te.getStu().add(st2);
  te.getStu().add(st3);
  
  System.out.println(te+"  他有哪些学生：");
  Iterator it=te.getStu().iterator();
  while(it.hasNext()){
   Student s=(Student)it.next();
   System.out.println(s);
  }
  
  
 }}

 

3、不难，运行一下看看。