Method parseIntArrayList

**Newoor** · November 25th, 2009, 01:16 PM

This code was originally for lisp lists, i modifed it for ArrayLists. But it doesn't work properly. It supposed to take a string ( a list of numbers), convert them to integers and return an ArrayList

public static ArrayList<Integer> parseIntArrayList(String str)
 {
  String line = str.trim();
  String contents = line.substring(1,line.length()-1).trim();
  if(contents.length()==0)
     return null;
  String[] nums = contents.split(",");
  ArrayList<Integer> list = null;
  for(int i=nums.length-1; i>=0; i--)
      {
       String num = nums[i].trim();
       list.add(i,Integer.parseInt(num));
      }
  return list;
 }

**copeg** · November 25th, 2009, 08:26 PM

You need to create a new ArrayList rather than initializing it to null aka ArrayList<Integer> list = new ArrayList<Integer>().

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