Convert Arraylist to an ArrayList or Integer Array [closed]

Answer 1

Define a method which will convert all String value of arraylist into integer.

private ArrayList getIntegerArray(ArrayList stringArray) {
        ArrayList result = new ArrayList();
        for(String stringValue : stringArray) {
            try {
                //Convert String to Integer, and store it into integer array list.
                result.add(Integer.parseInt(stringValue));
            } catch(NumberFormatException nfe) {
               //System.out.println("Could not parse " + nfe);
                Log.w("NumberFormat", "Parsing failed! " + stringValue + " can not be an integer");
            } 
        }       
        return result;
    }

And simply call that method, as

ArrayList resultList = getIntegerArray(strArrayList); //strArrayList is a collection of Strings as you defined.

Happy coding :)