集合嵌套之ArrayList嵌套ArrayList

import java.util.ArrayList;

import com.heima.bean.Person;

public class Demo5_ArrayListArrayList {
    /*
     * 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
     */
    public static void main(String[] args) {
        ArrayList<ArrayList<Person>> school = new ArrayList<>();
        ArrayList<Person> class1 = new ArrayList<>();
        class1.add(new Person("张三", 23));
        class1.add(new Person("李四", 24));
        class1.add(new Person("王五", 25));
        ArrayList<Person> class2 = new ArrayList<>();
        class2.add(new Person("张三一", 23));
        class2.add(new Person("李四一", 24));
        class2.add(new Person("王五一", 25));
        school.add(class1);
        school.add(class2);
        for (ArrayList<Person> outer : school) {
            for (Person in : outer) {
                System.out.println(in);
            }
        }

    }

}