Question

I have created 3 arraylists and stored data in it. I need to pass one single arraydata to other page and so I have added my individual arrays to the main array. But when I added one array to other the data is not being aded to that array. Here is my code:

static ArrayList<ArrayList<String>> stringList1=new ArrayList<ArrayList<String>>();
static ArrayList<ArrayList<String>> stringList3; 

stringList1 = Mypage.stringList1;

 ArrayList<String> optionlist = new ArrayList<String>();
stringList3 = new ArrayList<ArrayList<String>>();stringList3 = dbAdapter.selectRecordsFromDBList(query2, null); 
 for (int i = 0; i < stringList3.size(); i++) {
    optionlist = stringList3.get(i);
    System.out.print("option list size");
    System.out.print(optionlist.size());
    stringList1.add(optionlist);
    System.out.println("total stringlist1"+stringList1.get(0));

I am getting the stringList1 array values from Mypage and accessing that in new page. In the new page I am trying to add the optionlist array to stringList1 by giving stringList1.add(optionlist) but the data is not adding. Where I went wrong? Please help me regarding this… Thanks in Advance

Answer 1

After seeing your code I can guess that you have problem that elements of arrayList is not copy in another arrayList.If this is your issue then change your code like below

static ArrayList<ArrayList<String>> stringList1=new ArrayList<ArrayList<String>>();
static ArrayList<ArrayList<String>> stringList3; 

stringList1 = Mypage.stringList1;

ArrayList<String> optionlist;
stringList3 = new ArrayList<ArrayList<String>>();
stringList3 = dbAdapter.selectRecordsFromDBList(query2, null); 

 for (int i = 0; i < stringList3.size(); i++) {
    optionlist = new ArrayList<String>();
    optionlist = stringList3.get(i);
    System.out.print("option list size");
    System.out.print(optionlist.size());
    stringList1.add(optionlist);
    System.out.println("total stringlist1"+stringList1.get(0));
 }