[coolnfunky_raj]

Hi all

I am new to Java. I am working with ArrayLists and have a couple of questions in that. So here goes..

#1. I have an ArrayList and I keep adding Strings to it. Upon a certain condition, I add this ArrayList to an ArrayList of ArrayLists like this

Code:

class Test
{
       ArrayList<String> arr = new ArrayList<String>();
       ArrayList<ArrayList> arrOfArr = new ArrayList<ArrayList>();
       
       public void startElement (String tagName)
       {
             arr.add(tagName);
       }
       public void endElement ()
       {
             arrOfArr.add(arr);
       }
       public void removeLastElement ()
       {
             arr.remove(arr.size() -1);
       }

       public static void main(String args[])
       {
             Test test = new Test();
             test.startElement("ABC");
             test.startElement("DEF");
             test.endElement();
             test.removeLastElement();
             test.removeLastElement();
       }
}

In this code, when removeLastElement() is executed, the elements in arr as well as arrOfArr are removed. Is there a way to remove elements from arr but leave arrOfArr intact?

#2. In the above code, is there a way to convert arrOfArr to a String[][] without iterating through arrOfArr element by element?