OptionalDouble hashCode() method in Java with examples
The hashCode() method help us to get the hash code of the value, if Double value is present, otherwise 0 (zero) if no Double value is present in OptionalDouble object.
Syntax:
Attention reader! Don’t stop learning now. Get hold of all the important Java Foundation and Collections concepts with the Fundamentals of Java and Java Collections Course at a student-friendly price and become industry ready. To complete your preparation from learning a language to DS Algo and many more, please refer Complete Interview Preparation Course.
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 program to demonstrate// OptionalDouble.hashCode() method import java.util.OptionalDouble; public class GFG { public static void main(String[] args) { // create a OptionalDouble instance OptionalDouble opDouble = OptionalDouble.of(253255.432525); System.out.println("OptionalDouble: " + opDouble.toString()); // get hashCode value using hashCode() System.out.println("HashCode value: " + opDouble.hashCode()); }} |
OptionalDouble: OptionalDouble[253255.432525] HashCode value: 885080309
Program 2:
// Java program to demonstrate// OptionalDouble.hashCode() method import java.util.OptionalDouble; public class GFG { public static void main(String[] args) { // create a OptionalDouble instance OptionalDouble opDouble = OptionalDouble.empty(); System.out.println("OptionalDouble: " + opDouble.toString()); // get hashCode value using hashCode() System.out.println("HashCode value: " + opDouble.hashCode()); }} |
OptionalDouble: OptionalDouble.empty HashCode value: 0
References: https://docs.oracle.com/javase/10/docs/api/java/util/OptionalDouble.html#hashCode()
