1 import java.util.ArrayList;
2
3 import com.heima.bean.Person;
4
5 public class Demo5_ArrayListArrayList {
6 /*
7 * 集合嵌套之ArrayList嵌套ArrayList 案例:一个学校有好多班级,一个班级又有好多人;遍历输出这个学校的所有人
8 */
9 public static void main(String[] args) {
10 ArrayList<ArrayList<Person>> school = new ArrayList<>();
11 ArrayList<Person> class1 = new ArrayList<>();
12 class1.add(new Person("张三", 23));
13 class1.add(new Person("李四", 24));
14 class1.add(new Person("王五", 25));
15 ArrayList<Person> class2 = new ArrayList<>();
16 class2.add(new Person("张三一", 23));
17 class2.add(new Person("李四一", 24));
18 class2.add(new Person("王五一", 25));
19 school.add(class1);
20 school.add(class2);
21 for (ArrayList<Person> outer : school) {
22 for (Person in : outer) {
23 System.out.println(in);
24 }
25 }
26
27 }
28
29 }
