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

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

Examples:

Input: Set<String> = ["Geeks", "ForGeeks", "GeeksForGeeks"]
Output: "Geeks, For, Geeks"

Input: Set<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 Set of String.
2. Form a comma separated String from the Set of String using join() method by passing comma ‘, ‘ and the set as parameters.
3. Print the String.

Below is the implementation of the above approach:

// Java program to convert Set of String
// to comma separated String

import java.util.*;

public class GFG {
    public static void main(String args[])
    {

        // Get the Set of String
        Set<String>
            set = new HashSet<>(
                Arrays
                    .asList("Geeks",
                            "ForGeeks",
                            "GeeksForGeeks"));

        // Print the Set of String
        System.out.println("Set of String: " + set);

        // Convert the Set of String to String
        String string = String.join(", ", set);

        // Print the comma separated String
        System.out.println("Comma separated String: "
                           + string);
    }
}

Output:

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