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Java Double class hashCode() method with example

Double class hashCode() method: Here, we are going to learn about the hashCode() method of Double class with its syntax and example.
Submitted by Preeti Jain, on September 24, 2019

Double class hashCode() method

  • hashCode() method is available in 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();

Parameter(s):

  • 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






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