Main.java

import java.util.*;
import static br.com.felipebelluco.javaplayground.PredicateUtil.negate;

public class Main {

    public static void main(String[] args) {
        List<String> list = Arrays.asList("foo", "", "bar");

        // Instead of this...
        list.stream().filter(name -> !name.isEmpty()).forEach(System.out::println);

        // Use this
        list.stream().filter(negate(String::isEmpty)).forEach(System.out::println);
    }

}

PredicateUtil.java

import java.util.function.Predicate;

public class PredicateUtil {
    static <T> Predicate<T> negate(Predicate<T> predicate) {
        return predicate.negate();
    }
}