Java Stream How to - Find first with Optional

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Question

We would like to know how to find first with Optional.

Answer

//from   w w  w .  j  a  v a  2  s  . c  o m
import java.util.Arrays;
import java.util.List;
import java.util.Optional;

public class Main {
    public static void main(String[] args) {
        List<String> names = Arrays.asList("Bob", "Tom", "Jeff", "Scott", "Jennifer", "Steve");

        Optional<String> firstS = names.stream().filter(name -> name.startsWith("S")).findFirst();
        System.out.println(firstS.orElse("None found"));

        Optional<String> firstZ = names.stream().filter(name -> name.startsWith("Z")).findFirst();
        if (firstZ.isPresent()) {
            System.out.println(firstZ.get());
        } else {
            System.out.println("No Z's found");
        }
    }
}

The code above generates the following result.

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