OptionalLong help us to create an object which may or may not contain a Long value. The empty() method returns an empty OptionalLong instance. No value is present for this OptionalLong. So we can say that this method help us to create empty OptionalLong object. Syntax:
public static OptionalLong empty()
Parameters: This method accepts nothing. Return value: This method returns an empty OptionalLong. Below programs illustrate empty() method: Program 1:Â
Java
// Java program to demonstrate// OptionalLong.empty() methodÂ
import java.util.OptionalLong;Â
public class GFG {Â
    public static void main(String[] args)    {Â
        // create a OptionalLong        // using empty method        OptionalLong opLong            = OptionalLong.empty();Â
        // print OptionalLong        System.out.println("OptionalLong: "                           + opLong.toString());    }} |
Output:
OptionalLong: OptionalLong.empty
References: https://docs.oracle.com/javase/10/docs/api/java/util/OptionalLong.html#empty()
