hi,

i have created application to add string values and Integer Values in ArrayList. but I dont know how to extract String values only from the ArrayList. Please anyone say how to deal with it?.

Thank you

Hi,
If I understand you right, you need to separate only String values from your array list.

I can suggest you the following way:

As all the ArrayList elements are Objects you can use toString() method fot them and get Strings for all of your ArrayList elements, even for Integers. Then you can simply check whether current arraylist_element.toString() characters are entirely 'numeric' or not, e.g. character is between '0' and '9'. If all the characters are 'numeric' then you have a integer number and you can remove it from your ArrayList.

Hope this helps you :)

Best,
Anna

Another way would be creating a new ArrayList. Use either the 'instanceof' operator or the getClass() method.

You can loop through the ArrayList, check if the current element is an instanceof 'String' OR if currElement.getClass() == String.class, and if it is, you add it to a new ArrayList.

HTH!

Hi,
  Check this program. I created two new Arraylists,one will contain integer values and second will contain String values.

   public static void main(String argds[]){

        ArrayList aList = new ArrayList();
        aList.add("Java");
        aList.add("123");
        aList.add("Sun");
        aList.add(new Integer(5));
        aList.add("J2EE");

        ArrayList intList = new ArrayList();
        ArrayList strList = new ArrayList();

        for(Object o:aList){
            try{
                Double.parseDouble(o.toString());
                intList.add(o);
            }
            catch(Exception e){
                strList.add(o);
            }
        }
        for(Object o:intList){
            System.out.println(o);
        }
        for(Object o:strList){
            System.out.println(o);
        }
    }

I hope this can be useful.

Venkat.K