ArrayList in ArrayList<String>

Question

ArrayList<ArrayList<String>> mainlist = new ArrayList<ArrayList<String>>();
ArrayList<String> childlist = new ArrayList<String>();

for (int i = 0; i < 3 i++){
   String chlidtext = chlidlist + String.valueof(i);
   String maintext = mainlist +String.Valueof(i);
   childlist.add(chlidtext);
   mainlist.add(maintext);
}

返回主名单；

我不知道如何在每个列表中得到第三个元素？

Answer 1

您可以通过以下方式访问childList的第三个元素：

mainList.get(index).get(2); // Here 1st get() will get the 1st element of mainList which conatins 1st child element and 2nd get() will get the 3rd element of childlist.