This post explains a Comma Separated String  to ArrayList using Java. I am using Java Generics for Converting  a Comma Separated String into based on your DataType  ArrayList.

Sample Java Program For Converting String into List.

import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.util.ArrayList;
import java.util.List;

 * @author Venkata Ramu Kandulapati
public class ConvertToList {
       public <T> List<T> toList(String comaSepString, T t) throws Exception {

              List<T> list = new ArrayList<T>();
              Constructor<?> constructor = t.getClass().getConstructor(String.class);

              for (String _s : comaSepString.split(",")) {
                     list.add((T) constructor.newInstance(_s));
              return list;

       public static void main(String args[]) throws Exception {
              String numberString ="1,2,3,4";
              System.out.println(new ConvertToList().toList(numberString, new Integer(0)));
              String comaSepString = "Windows,Ubuntu,IOS";
              System.out.println(new ConvertToList().toList(comaSepString, new String()));

Output of Above Program:
[1, 2, 3, 4]
[Windows, Ubuntu, IOS]


          In the above java Program convert the coma separated String into ArrayList.Your Coma separated String values may be String,Integer,Float or Double whatever the DataType this program is convert into ArrayList based on your Sending DataType.


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