Convert String into comma separated List in Java

Given a String, the task is to convert it into comma separated List.

Examples:

Input: String = "Geeks For Geeks"
Output: List = [Geeks, For, Geeks]

Input: String = "G e e k s"
Output: List = [G, e, e, k, s]

Approach: This can be achieved by converting the String into String Array, and then creating an List from that array. However this List can be of 2 types based on their method of creation – modifiable, and unmodifiable.

• Creating an unmodifiable List:

  
  

  
  
  

  // Java program to convert String // to comma separated List    import java.util.*;    public class GFG {     public static void main(String args[])     {            // Get the String         String string = "Geeks For Geeks";            // Print the String         System.out.println("String: " + string);            // convert String to array of String         String[] elements = string.split(" ");            // Convert String array to List of String         // This List is unmodifiable         List<String> list = Arrays.asList(elements);            // Print the comma separated List         System.out.println("Comma separated List: "                            + list);     } }
  Output:

  String: Geeks For Geeks
  Comma separated List: [Geeks, For, Geeks]
  

• Creating a modifiable List:

  
  

  
  
  

  // Java program to convert String // to comma separated List    import java.util.*;    public class GFG {     public static void main(String args[])     {            // Get the String         String string = "Geeks For Geeks";            // Print the String         System.out.println("String: " + string);            // convert String to array of String         String[] elements = string.split(" ");            // Convert String array to List of String         // This List is modifiable         List<String>             list = new ArrayList<String>(                 Arrays.asList(elements));            // Print the comma separated List         System.out.println("Comma separated List: "                            + list);     } }
  Output:

  String: Geeks For Geeks
  Comma separated List: [Geeks, For, Geeks]