ArrayList存储学生对象并遍历升级版

package Com;
import java.util.ArrayList;
import java.util.Scanner;


public class Demon1 {
    public static void main(String[] args) {
        ArrayList a = new ArrayList<>();
            
        addStudent(a);
        addStudent(a);
        addStudent(a);
        for (int i = 0; i < a.size(); i++) {
            Student aaa=a.get(i);
            System.out.println(aaa.getName()+aaa.getAge());
        }
        }
        
    public static void addStudent(ArrayList e){
        Scanner bb = new Scanner(System.in);
        System.out.println("请输入学生名字");
        String bb2 = bb.nextLine();
        System.out.println("请输入学生年龄");
        int bb3 = bb.nextInt();
        Student s = new Student(bb2, bb3);;
        e.add(s);//这个改变了相当于实参也改变了
    }
}