HashMap嵌套ArrayList

package com.bigdat.java.day22;
import java.util.*;
/*
        HashMap嵌套ArrayList
 */
public class HashMapAndArrayList {
    public static void main(String[] args) {
        //创建 HashMap 班级集合
        HashMap, String> asMap = new HashMap<>();
        //创建 ArrayList集合
        ArrayList pt = new ArrayList();
        ArrayList jy = new ArrayList();
        ArrayList hh = new ArrayList();
        //创建普通班学生
        Student1 s1 = new Student1("普通一",21);
        Student1 s2 = new Student1("普通二",22);
        Student1 s3 = new Student1("普通三",23);
        //创建精英班学生
        Student1 s4 = new Student1("精英四",24);
        Student1 s5 = new Student1("精英五",25);
        //创建豪华班学生
        Student1 s6 = new Student1("豪华六",26);
        //添加普通学生
        pt.add(s1);
        pt.add(s2);
        pt.add(s3);
        //添加精英学生
        jy.add(s4);
        jy.add(s5);
        //添加豪华学生
        hh.add(s6);
        //添加班级到集合中
        asMap.put(pt, "普通班");
        asMap.put(jy, "精英班");
        asMap.put(hh, "豪华班");
        //开始遍历大的班级集合
        //创建 键值对 的对象
        Set, String>> entries = asMap.entrySet();
        //创建 键值对 迭代器
        Iterator, String>> iterator = entries.iterator();
        while (iterator.hasNext()) {
            Map.Entry, String> next = iterator.next();
            ArrayList key = next.getKey();
            String value = next.getValue();
            //创建学生的迭代器
            Iterator iterator1 = key.iterator();
            while(iterator1.hasNext()){
                Student1 next1 = iterator1.next();
                String name = next1.getName();
                int age = next1.getAge();
                System.out.println("班级："+value+",姓名："+name+",年龄："+age);
            }
        }
    }
}

ArrayList中嵌套HashMap

package com.bigdat.java.day22;
import java.util.*;
/*
    ArrayList中嵌套HashMap
 */
public class ArrayListAndHashMap {
    public static void main(String[] args) {
        //创建大的班级集合
        ArrayList> list = new ArrayList<>();
        //创建各班级集合
        HashMap pt = new HashMap<>();
        HashMap jy = new HashMap<>();
        HashMap hh = new HashMap<>();
        //创建普通班学生
        Student1 s1 = new Student1("普通一",21);
        Student1 s2 = new Student1("普通二",22);
        Student1 s3 = new Student1("普通三",23);
        //创建精英班学生
        Student1 s4 = new Student1("精英四",24);
        Student1 s5 = new Student1("精英五",25);
        //创建豪华班学生
        Student1 s6 = new Student1("豪华六",26);
        //学生添加入班级
        pt.put(s1, "普通班");
        pt.put(s2, "普通班");
        pt.put(s3, "普通班");

        jy.put(s4, "精英班");
        jy.put(s5, "精英班");

        hh.put(s6, "豪华班");
        //将班级远元素加入
        list.add(pt);
        list.add(jy);
        list.add(hh);

        //开始遍历
        for (HashMap student1StringHashMap : list) {
            Set> entries = student1StringHashMap.entrySet();
            for (Map.Entry entry : entries) {
                Student1 key = entry.getKey();
                String value = entry.getValue();
                String name = key.getName();
                int age = key.getAge();
                System.out.println("班级："+value+"，姓名："+name+",年龄："+age);
            }
        }
        }

}