import java.util.List ;

import java.util.ArrayList ;

public class School{

    private String name ;

    private List<Student> allStudents ;

    public School(){

        this.allStudents = new ArrayList<Student>() ;

    }

    public School(String name){

        this() ;

        this.setName(name) ;

    }

    public void setName(String name){

        this.name = name ;

    }

    public String getName(){

        return this.name;

    }

    public List<Student> getAllStudents(){

        return this.allStudents ;

    }

    public String toString(){

        return "学校名称：" + this.name ;

    }

};

public class Student{

    private String name ;

    private int age ;

    private School school; // 一个学生属于一个学校

    public Student(String name,int age){

        this.setName(name) ;

        this.setAge(age) ;

    }

    public void setSchool(School school){

        this.school = school ;

    }

    public School getSchool(){

        return this.school ;

    }

    public void setName(String name){

        this.name = name ;

    }

    public void setAge(int age){

        this.age = age ;

    }

    public String getName(){

        return this.name;

    }

    public int getAge(){

        return this.age ;

    }

    public String toString(){

        return "学生姓名：" + this.name + "；年龄：" + this.age ;

    }

};

import java.util.Iterator ;

public class TestDemo{

    public static void main(String args[]){

        School sch = new School("清华大学") ;    // 定义学校

        Student s1 = new Student("张三",21) ;

        Student s2 = new Student("李四",22) ;

        Student s3 = new Student("王五",23) ;

        sch.getAllStudents().add(s1) ;

        sch.getAllStudents().add(s2) ;

        sch.getAllStudents().add(s3) ;

        s1.setSchool(sch) ;

        s2.setSchool(sch) ;

        s3.setSchool(sch) ;

        System.out.println(sch) ;

        Iterator<Student> iter = sch.getAllStudents().iterator() ;

        while(iter.hasNext()){

            System.out.println("\t|- " + iter.next()) ;

        }

    }

};