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:

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()); 
    } 
} 

Output:

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()); 
    } 
} 

Output:

OptionalDouble: OptionalDouble.empty
HashCode value: 0

References: https://docs.oracle.com/javase/10/docs/api/java/util/OptionalDouble.html#hashCode()

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