The stream() method help us to get Long value contain by OptionalLong as LongStream.If a value is present, method returns a sequential LongStream containing only that value, otherwise returns an empty LongStream.
Syntax:
public LongStream stream()
Parameters: This method accepts nothing.
Return value: This method returns the optional value as an LongStream.
Below programs illustrate stream() method:
Program 1:
// Java program to demonstrate// OptionalLong.stream() method import java.util.OptionalLong;import java.util.stream.LongStream; public class GFG { public static void main(String[] args) { // create a OptionalLong OptionalLong opLong = OptionalLong.of(163252382159472124L); // get value as stream LongStream out = opLong.stream(); // print value System.out.print("Value: "); out.forEach(System.out::print); }} |
Output:
Program 2:
// Java program to demonstrate// OptionalLong.stream() method import java.util.OptionalLong;import java.util.stream.LongStream; public class GFG { public static void main(String[] args) { // create a empty OptionalLong OptionalLong opLong = OptionalLong.empty(); // get value as stream LongStream out = opLong.stream(); // print value System.out.print("length of Long Stream: " + out.count()); }} |
Output:
References: https://docs.oracle.com/javase/10/docs/api/java/util/OptionalLong.html#empty()
