OptionalInt hashCode() method in Java with examples

Last Updated : 1 May, 2019
The hashCode() method help us to get the hash code of the value, if Int value is present, otherwise 0 (zero) if no Int value is present in OptionalInt object. Syntax: 
public int hashCode()
Parameters: This method accepts 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
// OptionalInt.hashCode() method

import java.util.OptionalInt;

public class GFG {

    public static void main(String[] args)
    {

        // create a OptionalInt instance
        OptionalInt opInt
            = OptionalInt.of(253);

        System.out.println("OptionalInt: "
                           + opInt.toString());

        // get hashCode value using hashCode()
        System.out.println("HashCode value: "
                           + opInt.hashCode());
    }
}
Output: 
OptionalInt: OptionalInt[253]
HashCode value: 253
Program 2: Java 
// Java program to demonstrate
// OptionalInt.hashCode() method

import java.util.OptionalInt;

public class GFG {

    public static void main(String[] args)
    {

        // create a OptionalInt instance
        OptionalInt opInt
            = OptionalInt.empty();

        System.out.println("OptionalInt: "
                           + opInt.toString());

        // get hashCode value using hashCode()
        System.out.println("HashCode value: "
                           + opInt.hashCode());
    }
}
Output: 
OptionalInt: OptionalInt.empty
HashCode value: 0
References: https://docs.oracle.com/javase/10/docs/api/java/util/OptionalInt.html#hashCode()
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