Java Stream How to - Sort a null list with Optional.ofNullable and ifPresent

• Back to Stream Sort  ↑

Question

We would like to know how to sort a null list with Optional.ofNullable and ifPresent.

Answer

import java.util.Comparator;
import java.util.List;
import java.util.Optional;
//from   w ww . j a v  a  2s . c om

public class Main {
  public static void main(String... args) {
    List<String> names3 = null;

    Optional.ofNullable(names3).ifPresent(list -> list.sort(Comparator.naturalOrder()));

    System.out.println(names3);

  }
}

The code above generates the following result.

• Back to Stream Sort  ↑