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()
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