Java - Double Class hashCode() Method

Double class hashCode() method: Here, we are going to learn about the hashCode() method of Double class with its syntax and example. By Preeti Jain Last updated : March 23, 2024

Double class hashCode() method

hashCode() method is available in Double class of java.lang package.
hashCode() method is used to return hashcode of the Double-object.
hashCode() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
hashCode() method does not throw an exception at the time of returning hashcode.

Syntax

public int hashCode();

Parameters

It does not accept any parameter.

Return Value

The return type of this method is int, it returns hash code for this object.

Example

// Java program to demonstrate the example 
// of int hashCode() method of Double class

public class HashCodeOfDoubleClass {
    public static void main(String[] args) {
        // Variables initialization
        double value1 = 30.20;
        double value2 = 10.20;

        // It returns hashcode value denoted by this Double d1 object
        // by calling d1.hashCode()
        Double d1 = new Double(value1);

        // Display d1 result
        System.out.println("d1.hashCode(): " + d1.hashCode());

        // It returns hashcode value denoted by this Double d2 object
        // by calling d2.hashCode()
        Double d2 = new Double(value2);

        // Display d2 result
        System.out.println("d2.hashCode(): " + d2.hashCode());
    }
}

Output

d1.hashCode(): 1930231808
d2.hashCode(): 641859584

Java - Double longBitsToDouble() Method

Java - Double equals() Method