1 package day7.lesson1.anli3;
2
3 import java.util.ArrayList;
4 import java.util.HashMap;
5 import java.util.Set;
6
7 /*
8 1.5.3 案例-集合嵌套之ArrayList嵌套HashMap（ArrayList集合存储HashMap元素并遍历）
9 创建一个ArrayList集合，存储三个元素，每一个元素都是HashMap
10 每一个HashMap的键和值都是String，并遍历。
11 */
12 public class ArrayListIncludeHashMapDemo {
13 public static void main(String[] args) {
14 ArrayList< HashMap<String, String> > arrayList = new ArrayList<>();
15
16 HashMap<String, String> hm1 = new HashMap<>();
17 hm1.put("孙策", "大乔");
18 hm1.put("周瑜", "小乔");
19 arrayList.add(hm1);
20
21 HashMap<String, String> hm2 = new HashMap<>();
22 hm2.put("郭靖", "黄蓉");
23 hm2.put("杨过", "小龙女");
24 arrayList.add(hm2);
25
26 HashMap<String, String> hm3 = new HashMap<>();
27 hm3.put("令狐冲", "任盈盈");
28 hm3.put("林平之", "岳灵珊");
29 arrayList.add(hm3);
30
31 for (HashMap<String, String> hm: arrayList){
32 Set<String> keySet = hm.keySet();
33 for (String key: keySet){
34 String value = hm.get(key);
35 System.out.println(key + "," + value);
36 }
37 }
38 }
39 }
1 package day7.lesson1.anli4;
2
3 import java.util.ArrayList;
4 import java.util.HashMap;
5 import java.util.Set;
6
7 /*
8 1.5.4 案例-集合嵌套之HashMap嵌套ArrayList（HashMap集合存储ArrayList元素并遍历）
9 创建一个HashMap集合，存储三个键值对元素，每一个键值对元素的键是String，值是ArrayList
10 每一个ArrayList的元素是String，并遍历。
11 */
12 public class HashMapIncludeArrayListDemo {
13 public static void main(String[] args) {
14 HashMap< String, ArrayList<String> > hashMap = new HashMap<>();
15
16 ArrayList<String> al1 = new ArrayList<>();
17 al1.add("诸葛亮");
18 al1.add("赵云");
19 hashMap.put("三国演义", al1);
20
21 ArrayList<String> al2 = new ArrayList<>();
22 al2.add("孙悟空");
23 al2.add("唐僧");
24 hashMap.put("西游记", al2);
25
26 ArrayList<String> al3 = new ArrayList<>();
27 al3.add("武松");
28 al3.add("鲁智深");
29 hashMap.put("水浒传", al3);
30
31 Set<String> keySet = hashMap.keySet();
32 for (String key: keySet){
33 System.out.println(key + ":");
34 ArrayList<String> value = hashMap.get(key);
35 for (String s: value){
36 System.out.println("\t" + s);
37 }
38 }
39 }
40 }
