The hashCode() method help us to get the hash code of the value, if Long value is present, otherwise 0 (zero) if no Long value is present in OptionalLong object. Syntax:
public int hashCode()
Parameters: This method does not accepts any parameter. Return value: This method returns hash code value of the present value or 0 if no value is present. Below programs illustrate hashCode() method: Program 1:Â
Java
// Java program to demonstrate// OptionalLong.hashCode() methodÂ
import java.util.OptionalLong;Â
public class GFG {Â
    public static void main(String[] args)    {Â
        // create a OptionalLong instance        OptionalLong opLong            = OptionalLong.of(253255);Â
        System.out.println("OptionalLong: "                           + opLong.toString());Â
        // get hashCode value using hashCode()        System.out.println("HashCode value: "                           + opLong.hashCode());    }} |
Output:
OptionalLong: OptionalLong[253255] HashCode value: 253255
Program 2:Â
Java
// Java program to demonstrate// OptionalLong.hashCode() methodÂ
import java.util.OptionalLong;Â
public class GFG {Â
    public static void main(String[] args)    {Â
        // create a OptionalLong instance        OptionalLong opLong            = OptionalLong.empty();Â
        System.out.println("OptionalLong: "                           + opLong.toString());Â
        // get hashCode value using hashCode()        System.out.println("HashCode value: "                           + opLong.hashCode());    }} |
Output:
OptionalLong: OptionalLong.empty HashCode value: 0
References: https://docs.oracle.com/javase/10/docs/api/java/util/OptionalLong.html#hashCode()
