数组列表方法在类返回垃圾值中定义

Question

基本上是java的新学习者，只能通过自我阅读。希望对此代码有所帮助。感谢名单

public class retrievelist{

public static void main(String[] args){

    StoreList a=new StoreList();
    for(int j=0;j<3;j++){
     a.addData(j, "joe");
    }
    System.out.println(a.data.size());
    for(int i=0;i<a.data.size();i++){
        System.out.println(a.getdata(i));
    }
}
}

StoreList.java

import java.util.ArrayList;
public class StoreList {
   private int id;
   private String first;
   ArrayList<StoreList> data=new ArrayList<StoreList>();
   public void addData(int id,String first){
    StoreList info=new StoreList();
    info.id=id;
    info.first=first;
    data.add(info);
}
public ArrayList getdata(){
    return data;
}
}

当我运行此代码时，我得到类似的东西 StoreList @ 2a717ef5