集合多层嵌套使用-蒲公英云

集合多层嵌套使用

package com.cnd06;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Set;
/**
 * 集合多层嵌套代码体现
 * 
 * @author ndci
 *
 */
public class HashDemo {
    public static void main(String[] args) {
        HashMap<String, HashMap<String, ArrayList<Student>>> czbkMap = new HashMap<String, HashMap<String, ArrayList<Student>>>();
        // czbk北京校区
        HashMap<String, ArrayList<Student>> bjMap = new HashMap<String, ArrayList<Student>>();
        // czbk北京校区->基础班
        ArrayList<Student> array1 = new ArrayList<Student>();
        Student s1 = new Student("李月", 20);
        Student s2 = new Student("赵毅", 22);
        array1.add(s1);
        array1.add(s2);
        bjMap.put("基础班", array1);
        // czbk北京校区->就业班
        ArrayList<Student> array2 = new ArrayList<Student>();
        Student s3 = new Student("钱龙", 21);
        Student s4 = new Student("王军", 24);
        array2.add(s3);
        array2.add(s4);
        bjMap.put("就业班", array2);
        czbkMap.put("北京校区", bjMap);
        // czbk上海校区
        HashMap<String, ArrayList<Student>> shMap = new HashMap<String, ArrayList<Student>>();
        // czbk上海校区->基础班
        ArrayList<Student> array3 = new ArrayList<Student>();
        Student s5 = new Student("李玉龙", 25);
        Student s6 = new Student("王昭君", 26);
        array3.add(s5);
        array3.add(s6);
        shMap.put("基础班", array3);
        // czbk上海校区->就业班
        ArrayList<Student> array4 = new ArrayList<Student>();
        Student s7 = new Student("唐静", 25);
        Student s8 = new Student("朱张", 27);
        array4.add(s7);
        array4.add(s8);
        shMap.put("就业班", array4);
        czbkMap.put("上海校区", shMap);
        // 遍历集合
        Set<String> czbkMapSet = czbkMap.keySet();
        for (String key : czbkMapSet) {
            System.out.println(key);
            HashMap<String, ArrayList<Student>> czbkMapValue = czbkMap.get(key);
            Set<String> czbkMapValueSet=czbkMapValue.keySet();
            for(String key2:czbkMapValueSet) {
                System.out.println("\t"+key2);
                ArrayList<Student> arraylist=czbkMapValue.get(key2);
                for(Student s:arraylist) {
                    System.out.println("\t\t"+s.getName()+"-----"+s.getAge());
                }
            }
        }
    }
}