Map中存一个对象（学号，姓名，年龄）

Question

下面代码错了，错在哪，怎么改

 public class TestStudent {

    public static void main(String[] args) {
        // TODO Auto-generated method stub

        Map<Student,Student> map = new HashMap<Student,Student>();
        map.put(new Student(902),new Student("彭杰",19));
        Set set = map.keySet();
        Iterator iterator = set.iterator();
        while (iterator.hasNext()){
            System.out.println(iterator.next().number);
            System.out.println(iterator.next().name);
            System.out.println(iterator.next().age);
        }
    }

}
public class Student {

     private long number;
     private String name;
     private int age;
    public Student(String name,int age){
        this.name = name;
        this.age = age;
    }
    public Student(long number){
        this.number = number;
    }
}

Answer 1

map.put(new Student(902),new Student("彭杰",19));
你这个只建立了一个条目，并且把两个student一个存到key一个存到value
这么做也没错，但是可能不是你想要的，估计你想插入2次。