String.join is an easy-to-use utility method in String class.

public class StringJoin{      public static void main(String args[]){          //The first argument (refered as joinString) is used to join the subsequent argument(s)        String finalString = String.join("-","String","join","example"," Hyphen(-) used to join");        System.out.println("Output 1: " + finalString);          //In case there is only 1 argument after the first argument, then the second argument is not appended with the joinString        finalString = String.join("-","String");        System.out.println("Output 2: " + finalString);      }}