Java Stream How to - Use String::isEmpty as method reference for Predicate

Question

We would like to know how to use String::isEmpty as method reference for Predicate.

Answer

import java.util.function.Predicate;

public class Main {
  public static void main(String... args) {
    Predicate<String> isEmpty = String::isEmpty;
    System.out.println(isEmpty.test(""));
    System.out.println(isEmpty.negate().test(""));
  }
}

The code above generates the following result.