HashMap存储学生并遍历

HashMap存储学生并遍历
同一包下新建Student类
package it.com.cc.seven;

public class Student {

private String name;
private int age;

public Student() {
}

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

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;
}}

新建HashMapTest类
package it.com.cc.seven;

import java.util.HashMap;
import java.util.Map;
import java.util.Set;

public class HashMapTest {

public static void main(String[] args) {
    //        创建HashMap对象
    HashMap<String,Student> hm=new HashMap<String,Student>();
    //        创建学生对象
       Student s1=new Student("刘德华",40);
    Student s2=new Student("成龙",30);
    Student s3=new Student(&#