集合框架_集合多层嵌套的代码体现

package cn.itcast_06;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Set;

/*
 * 为了更符合要求：
 *     这次的数据就看成是学生对象。
 * 
 * 北大青鸟
 *     bj  北京校区
 *       jc  基础班
 *           林青霞 27
 *           风清扬 30
 *       jy  就业班 
 *           赵雅芝 28
 *           李刚    29
 *     sh  上海校区
 *       jc  基础班
 *           郭美美 20
 *           犀利哥 22
 *       jy  就业班 
 *           罗玉凤 21
 *           马征    23
 *     gz  广州校区
 *       jc  基础班
 *           王力宏 30
 *           李静磊 32
 *       jy  就业班 
 *           郎朗    31
 *           柳岩    33
 *     xa  西安校区
 *       jc  基础班
 *           范冰冰 27
 *           孙成文 30
 *       jy  就业班 
 *           李冰冰 28
 *           张志豪 29
 */
public class HashMapDemo {
  public static void main(String[] args) {
    // 创建大集合
    HashMap<String, HashMap<String, ArrayList<Student>>> bdqnMap = new HashMap<String, HashMap<String, ArrayList<Student>>>();

    // 北京校区
    HashMap<String, ArrayList<Student>> bjBdqnMap = new HashMap<String, ArrayList<Student>>();
    ArrayList<Student> bj_jcArray = new ArrayList<Student>();
    Student bj_s1 = new Student("林青霞", 27);
    Student bj_s2 = new Student("风清扬", 30);
    bj_jcArray.add(bj_s1);
    bj_jcArray.add(bj_s2);
    bjBdqnMap.put("基础班", bj_jcArray);
    ArrayList<Student> bj_jyArray = new ArrayList<Student>();
    Student bj_s3 = new Student("赵雅芝", 28);
    Student bj_s4 = new Student("李刚", 29);
    bj_jyArray.add(bj_s3);
    bj_jyArray.add(bj_s4);
    bjBdqnMap.put("就业班", bj_jyArray);
    bdqnMap.put("北京校区", bjBdqnMap);

    // 上海校区
    HashMap<String, ArrayList<Student>> shBdqnMap = new HashMap<String, ArrayList<Student>>();
    ArrayList<Student> sh_jcArray = new ArrayList<Student>();
    Student sh_s1 = new Student("郭美美", 20);
    Student sh_s2 = new Student("犀利哥", 22);
    sh_jcArray.add(sh_s1);
    sh_jcArray.add(sh_s2);
    shBdqnMap.put("基础班", sh_jcArray);
    ArrayList<Student> sh_jyArray = new ArrayList<Student>();
    Student sh_s3 = new Student("罗玉凤", 21);
    Student sh_s4 = new Student("马征 ", 23);
    sh_jyArray.add(sh_s3);
    sh_jyArray.add(sh_s4);
    shBdqnMap.put("就业班", sh_jyArray);
    bdqnMap.put("上海校区", shBdqnMap);

    // 广州校区
    HashMap<String, ArrayList<Student>> gzBdqnMap = new HashMap<String, ArrayList<Student>>();
    ArrayList<Student> gz_jcArray = new ArrayList<Student>();
    Student gz_s1 = new Student("王力宏", 30);
    Student gz_s2 = new Student("李静磊", 32);
    gz_jcArray.add(gz_s1);
    gz_jcArray.add(gz_s2);
    gzBdqnMap.put("基础班", gz_jcArray);
    ArrayList<Student> gz_jyArray = new ArrayList<Student>();
    Student gz_s3 = new Student("郎朗", 31);
    Student gz_s4 = new Student("柳岩", 33);
    gz_jyArray.add(gz_s3);
    gz_jyArray.add(gz_s4);
    gzBdqnMap.put("就业班", gz_jyArray);
    bdqnMap.put("广州校区", gzBdqnMap);

    // 西安校区
    HashMap<String, ArrayList<Student>> xaBdqnMap = new HashMap<String, ArrayList<Student>>();
    ArrayList<Student> xa_jcArray = new ArrayList<Student>();
    Student xa_s1 = new Student("范冰冰", 27);
    Student xa_s2 = new Student("孙成文", 30);
    xa_jcArray.add(xa_s1);
    xa_jcArray.add(xa_s2);
    xaBdqnMap.put("基础班", xa_jcArray);
    ArrayList<Student> xa_jyArray = new ArrayList<Student>();
    Student xa_s3 = new Student("李冰冰", 28);
    Student xa_s4 = new Student("张志豪", 29);
    xa_jyArray.add(xa_s3);
    xa_jyArray.add(xa_s4);
    xaBdqnMap.put("就业班", xa_jyArray);
    bdqnMap.put("西安校区", xaBdqnMap);

    // 遍历集合
    Set<String> bdqnMapSet = bdqnMap.keySet();
    for (String bdqnMapKey : bdqnMapSet) {// bdqnMapKey校区
      System.out.println(bdqnMapKey + "\t");
      HashMap<String, ArrayList<Student>> bdqnMapValue = bdqnMap
          .get(bdqnMapKey);
      Set<String> bdqnMapValueSet = bdqnMapValue.keySet();
      for (String bdqnMapValueKey : bdqnMapValueSet) {// bdqnMapValueKey班级
        System.out.println("\t" + bdqnMapValueKey + "\t");
        ArrayList<Student> array = bdqnMapValue.get(bdqnMapValueKey);
        for (Student stu : array) {// array学生
          System.out.println("\t\t" + stu.getName() + "---"
              + stu.getAge());
        }
      }
    }
  }
}