Double hashCode() method in Java with examples

The hashCode() method of Double class is a built-in method use to return the hashcode value of this Double object.

Syntax:

DoubleObject.hashCode()

Parameters: It takes no parameters.

Return Type: It returns an int value. The value returned is (int)(v^(v>>>32)) where v is a long variable equal to Double.doubleToLongBits(this.doubleValue()).

Below is the implementation of hashCode() method:

Example 1:

// Java code to demonstrate
// Double hashCode() Method

class GFG {
    public static void main(String[] args)
    {

        double d = 118.698;

        // creating Double object.
        Double value = new Double(d);

        // hashCode() method Double class
        int output = value.hashCode();

        // printing the output
        System.out.println("Hashcode Value of "
                           + value + " : "
                           + output);
    }
}

Output:

Hashcode Value of 118.698 : 1215072837

Example 2:

// Java code to demonstrate
// Double hashCode() Method

class GFG {
    public static void main(String[] args)
    {

        int i = -30;

        // creating Double object.
        Double value = new Double(i);

        // hashCode() method Double class
        int output = value.hashCode();

        // printing the output
        System.out.println("Hashcode Value of "
                           + value + " : "
                           + output);
    }
}

Output:

Hashcode Value of -30.0 : -1069678592