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 value of the present value or 0 if no value is present.
Below programs illustrate hashCode() method:
Program 1:
// 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 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()