Double hashCode() method in Java with examples (original) (raw)

Last Updated : 11 Jul, 2025

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 `

// 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 `

// 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