Java Streams - Stream findFirst() example

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Stream findFirst() returns an Optional for the first element of this stream, or an empty Optional if the stream is empty.

Syntax

findFirst has the following syntax.

Optional<T> findFirst()

Example

The following example shows how to use findFirst.

import java.util.Arrays;
import java.util.List;
import java.util.Optional;
//from  w  ww.  j  ava 2s. c o  m
public class Main {
  public static void main(String[] args) {
    List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5);
    Optional<Integer> o = numbers.stream()
                     .findFirst();
    if(o.isPresent()){
      System.out.println(o.get());
    }else{
      System.out.println("no value");
    }

  }
}

The code above generates the following result.

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