OptionalDouble hashCode() method in Java with examples Last Updated : 27 Dec, 2022 Comments Improve Suggest changes Like Article Like Report 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: 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 // 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()); } } Output:OptionalDouble: OptionalDouble[253255.432525] HashCode value: 885080309 Program 2: Java // 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()); } } Output:OptionalDouble: OptionalDouble.empty HashCode value: 0 References: https://docs.oracle.com/javase/10/docs/api/java/util/OptionalDouble.html#hashCode() Comment More infoAdvertise with us Next Article OptionalDouble hashCode() method in Java with examples A AmanSingh2210 Follow Improve Article Tags : Java Java - util package Java-Functions Java-OptionalDouble Practice Tags : Java Similar Reads Optional hashCode() method in Java with examples The hashCode() method of java.util.Optional class in Java is used to get the hashCode value of this Optional instance. If there is no value present in this Optional instance, then this method returns 0. Syntax: public int hashCode() Parameter: This method do not accepts any parameter. Return Value: 1 min read OptionalInt hashCode() method in Java with examples 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 val 1 min read Period hashCode() method in Java with Examples The hashCode() method of Period class in Java is used to get the generated hashCode for this period. Syntax: public int hashCode() Parameters: This method does not accepts any parameter. Return Value: This method returns the hashCode generated for the given period. Below programs illustrate the hash 2 min read Properties hashCode() method in Java with Examples The hashCode() method of Properties class is used to generate a hashCode for the given Properties containing key and values. Syntax: public int hashCode() Parameters: This method has no argument. Returns: This method returns the hashCode value for the given map. Below programs show the implementatio 2 min read SortedSet hashCode() method in Java with Examples The hashCode() method of SortedSet in Java is used to get the hashCode value for this instance of the SortedSet. It returns an integer value which is the hashCode value for this instance of the SortedSet. Syntax: public int hashCode() Parameters: This function has no parameters. Returns: The method 2 min read Like