ArrayList嵌套ArrayList 的奇怪错误求助

问题描述

    我首先输入参数 n 是每一页存放的数量，arrayList是待分页的数据，里面装的String参数，里面的 int i 代表分几页，然后，循环的时候输出都没问题，但是！！！！最后输出结果！！！却是object，一模一样的语句，没有类型转换，为什么输出不了？？？？

  这是输入的arrayList参数,是已经转为String的JSon格式的Map！

[{"address":"0","src":"0","name":"光电子测试设备","id":"1","detail":"0","type":"光电子","status":"0"}, {"address":"0","src":"0","name":"光电子测试设备","id":"2","detail":"0","type":"光电子","status":"0"}, {"address":"1","src":"5","name":"光电子测试设备","id":"4","detail":"0","type":"光电子","status":"1"}, {"address":"5","src":"9","name":"光电子测试设备","id":"5","detail":"5","type":"光电子","status":"5"}]

先贴上代码

package com.example.demo.common.DataTypeTransform;

import java.util.ArrayList;

public class Paging {


    public static ArrayList<ArrayList> getPageByArrayList(int n,ArrayList arrayList){
        //n:一页多少个
        ArrayList lingshi2=new ArrayList();
        ArrayList lingshi=new ArrayList();

        int size=arrayList.size();
        int i=size/n+1;
        if(size%n==0){
            i=size/n;
        }
        System.out.println("getPageByArrayList_i:"+i);

        if(i>=2){
           for (int j=0;j<i;j++){
               for (int k=0;k<n;k++)
               {
                   lingshi.add(arrayList.get(n*j+k));
                   System.out.println("Paging_lingshi:"+lingshi);
               }
               lingshi2.add(lingshi);

                //这里输出都没问题！！！
               System.out.println("Paging_lingshi2!!!:"+lingshi2);

               lingshi.clear();
           }

              //就这里！！！！！！
            System.out.println(lingshi2+"finally!!!!");

           
       }else
       {
           for(int j=0;j<size;j++){
               lingshi.add(arrayList.get(j));
           }
           lingshi2.add(lingshi);
           System.out.println(lingshi2);
       }
return lingshi2;
    }
}

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 出问题的截图