/**

* Created by fengqiang on 2017/4/25.

*/

/*

每一个学生都有对应的归属地。

学生Student，地址String。

学生属性：姓名，年龄。

注意：姓名和年龄相同的视为同一个学生。

保证学生的唯一性。

1，描述学生。

2，定义map容器。将学生作为键，地址作为值。存入。

3，获取map集合中的元素。

*/

import java.util.*;

class Student implements Comparable<Student>{

private int age;

private String name;

Student(String name, int age){

this.age = age;

this.name = name;

}

public String getName()

{

return name;

}

public int getAge()

{

return age;

}

public String toString()

{

return name+":"+age;

}

public int compareTo(Student s){

int num = new Integer(this.age).compareTo(new Integer(s.age));

if (num == 0)

return this.name.compareTo(s.name);

return num;

}

public boolean equals(Object obj)

{

if(!(obj instanceof Student))

throw new ClassCastException("类型不匹配");

Student s = (Student)obj;

return this.name.equals(s.name) && this.age==s.age;

}

}

class MapTest {

public static void main(String[] args){

HashMap<Student, String> hm = new HashMap<Student, String>();

hm.put(new Student("feng", 20),"beijing");

hm.put(new Student("lisi1",21),"beijing1");

hm.put(new Student("lisi1",21),"beijing2");

hm.put(new Student("lisi3",21),"beijing3");

Set<Student> keySet = hm.keySet();

Iterator<Student> it = keySet.iterator();

while (it.hasNext()){

Student stu = it.next();

String addr = hm.get(stu);

System.out.println(stu+"======"+addr);

}

}

}