Join String arguments into one String separated by comma (",")

join.java

/**
 * Join String arguments into one String separated by comma (",")
 * @param args input Strings
 * @return joined String
 */
public static String join(String... args) {
 if(args.length <1) throw new IllegalArgumentException();
 
 String joined = Arrays.toString(args);
 String result = joined.substring(1, joined.length()-1);
 return result;
}