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.

Get the List of String.
Form a comma separated String from the List of String using join() method by passing comma ‘, ‘ and the list as parameters.
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); 
    } 
} 

My Personal Notes

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