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()