OptionalLong hashCode() method in Java with examples

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:

Java

// Java program to demonstrate
// OptionalLong.hashCode() method

import java.util.OptionalLong;

public class GFG {

    public static void main(String[] args)
    {

        // create a OptionalLong instance
        OptionalLong opLong
            = OptionalLong.of(253255);

        System.out.println("OptionalLong: "
                           + opLong.toString());

        // get hashCode value using hashCode()
        System.out.println("HashCode value: "
                           + opLong.hashCode());
    }
}

Output:

OptionalLong: OptionalLong[253255]
HashCode value: 253255

Program 2:

Java

// Java program to demonstrate
// OptionalLong.hashCode() method

import java.util.OptionalLong;

public class GFG {

    public static void main(String[] args)
    {

        // create a OptionalLong instance
        OptionalLong opLong
            = OptionalLong.empty();

        System.out.println("OptionalLong: "
                           + opLong.toString());

        // 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()