java101-arraylist的遍历和增加

//arraylist的遍历和增加
 import java.util.ArrayList;
 public class test37 {
     public static void main(String[] args){
         ArrayList aa1=new ArrayList();
         //当前对象个数
         System.out.println(aa1.size());
         test35 xs1=new test35("歌谣",3,4);
         test35 xs2=new test35("小白",3,4);
         test35 xs3=new test35("歌谣",3,4);
         aa1.add(xs1);
         aa1.add(xs2);
         aa1.add(xs3);
         System.out.println("大小为"+aa1.size());
         for(int i=0;i<aa1.size();i++){
             test35 tv=(test35)aa1.get(i);
             System.out.println(tv);
             System.out.println("第"+(i+1)+"个学生姓名为"+tv.getName());
         }
     }
 }