Stream findFirst() example
Description
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 w w. ja va2 s .c om*/
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.
