java how to concatenate strings that are not null and empty in array

/**
 * @author lautturi.com 
 * Java example: java join array of strings exclude null and empty element
 */

import java.util.*;
import java.util.stream.Collectors;
import java.util.stream.Stream;
public class Lautturi {
	public static void main(String[] args) {

		String[] strArray = {"hello","lautturi",null,"python","","lau",null};
		Stream<String> stream = Arrays.stream(strArray);
		String joinedString = 
				stream.filter(s -> s != null && !s.isEmpty())
			          .collect(Collectors.joining("-"));

		System.out.println(joinedString);
	}
}

output:

hello-lautturi-world-lau