Java Double hashCode() method

The hashCode() method of Java Double class returns the hash code for this Double.

The result is obtained by performing exclusive OR operation on two halves of the long integer bit representation which is same as produced by the doubleToLongBits() method.

Overrides

The hashCode() method of class Double overrides the hashCode() method of class Object

Syntax

1.	public int hashCode()
2.	public static int hashCode(double value)

Parameters

1.NA

2.value - is the double value provided to hash

Return value

This method returns a hash code value for this double object.

Example 1

public class Double_hashCodeMethodExample1 {
public static void main(String[] args) {

         Double d1 = new Double(0.78);

            System.out.println("1. Hash Value = " +d1.hashCode());

            Double d2= new Double(79.0);

            System.out.println("\n2. Hash Value = " +d2.hashCode());

            //passing decimal value

            Double d3 = new Double(79.0001);

            System.out.println("\n3. Hash Value = " +d3.hashCode());

            //passing negative integer

            Double d4 = new Double(-79.098);

            System.out.println("\n4. Hash Value = " +d4.hashCode());

        }

    }

Output:

1. Hash Value = -1330324172

2. Hash Value = 1079230464

3. Hash Value = -482480461

4. Hash Value = 1637418694

Example 2

import java.util.Scanner;
public class Double_hashCodeMethodExample2 {
    Double id;
    Double adharCardNo;
    Double_hashCodeMethodExample2(){
            Scanner scanner =new Scanner(System.in);

            System.out.println("\nEnter your Adhar card No");

            Double adharCardNo=scanner.nextDouble();

            //hashCode() method will create unique ID for each unique AdmissionNo

            System.out.println("Your visit id is : "+Double.hashCode(adharCardNo));

        }
        public static void main(String[] args) {

            Double_hashCodeMethodExample2 obj= new Double_hashCodeMethodExample2();
            Double_hashCodeMethodExample2 obj1= new Double_hashCodeMethodExample2();
}
}

Output:

Enter your Adhar card No
5678
Your visit id is: 1085681152

Example 3

import java.lang.*;

public class Double_hashCodeMethodExample3 {

    public static void main(String[] args) {

            double d1 = 94;

            Double d2 =new Double(d1);

            //hash code method

            int d3 = d2.hashCode();

            System.out.println("HAsh code value = "+d3);

            //Hash code static method

            Double d4= new Double(94);

            System.out.println("Float value  = "+Double.hashCode(d4));

        }

    }

Output:

HAsh code value = 1079476224
Float value  = 1079476224

Example 4

public class Double_hashCodeMethodExample4 {
        public static void main(String[] args) {

            double d1=67.89;
            Double d2 =new Double(d1);
            Double d3= d2.hashCode();
            System.out.println("hash value = "+d3);
        }
    }

Output:

Error:(12, 35) java: incompatible types: int cannot be converted to java.lang.Double

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Java Double hashCode() method

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Java Double hashCode() method

Overrides

Syntax

Parameters

Return value

Example 1

Example 2

Example 3

Example 4

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