Convert a List of String to a comma separated String in Java

Given a List of String, the task is to convert the List to a comma separated String in Java. 

Examples:

Input: List<String> = ["Geeks", "ForGeeks", "GeeksForGeeks"] Output: "Geeks, For, Geeks" Input: List<String> = ["G", "e", "e", "k", "s"] Output: "G, e, e, k, s"

Approach: This can be achieved with the help of join() method of String as follows.

1. Get the List of String.
2. Form a comma separated String from the List of String using join() method by passing comma ', ' and the list as parameters.
3. Print the String.

Below is the implementation of the above approach: 

Program: 

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

List of String: [Geeks, ForGeeks, GeeksForGeeks] Comma separated String: Geeks,ForGeeks,GeeksForGeeks