HashMap两种遍历方式

package com.czie.iot1913.lps.Map;

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

/**
 * @author 1944900433@qq.com
 * @date 2022-03-20 20:24
 */
public class MapTest06 {
    public static void main(String[] args) {
        HashMap<String,Student> map = new HashMap<String,Student>();
        Student s1 = new Student("刘品水",21);
        Student s2 = new Student("品水",22);
        Student s3 = new Student("刘",27);
        map.put("158",s1);
        map.put("159",s2);
        map.put("160",s3);
        Set<String> set = map.keySet();
        for (String s:set){
            Student key = map.get(s);
            System.out.println(s+","+key.getName()+","+key.getAge());
        }
        System.out.println("==================");
        Set<Map.Entry<String, Student>> entry = map.entrySet();
        for (Map.Entry<String, Student> e:entry){
            String key01 = e.getKey();
            Student value01 = e.getValue();
            System.out.println(key01+","+value01.getName()+","+value01.getAge());

        }

    }
}

package com.czie.iot1913.lps.Map;

/**
 * @author 1944900433@qq.com
 * @date 2022-03-20 20:28
 */
public class Student {

    private String name;
    private int 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;
    }

    public Student() {
    }

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