How to join strings with separator

import com.google.common.base.Joiner;
 
public static void main(final String[] args) {
  final String output = Joiner.on(", ").join("white", "blue", "red", "black");
  System.out.println("output = " + output);        
}

output = white, blue, red, black

The Entertainer - Scott Joplin