Java - Variable Arguments

Varags2.java

public class Varargs2 {
  public static String insertComma(String... values) {
    String result = "";
    boolean first = true;

    for (String value : values) {
      result += (first ? "" : ", ") + value;
      first = false;
    }
    return result;
  }

  public static void main(String[] args) {
    System.out.println(insertComma("hallo"));
    System.out.println(insertComma("hallo", "welt"));
    System.out.println(insertComma("hallo", "welt", "123"));
  }
}