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Java Integer hashCode(int n) Method

The hashCode(int n) method is compatible with Java 1.8 or more version and is a part of the Integer class of the java.lang package. It is used to return the hash code of the integer passed as the argument.

This method is compatible with Integer.hashCode() method of Integer class.


public static int hashCode(int value)  


The parameter includes the int value of which hash code is to be generated.


The unique integer value (hash code) associated with the integer value passed as an argument.


The exceptions that can be encountered during the execution of this method are:

  • InputMismatchException
  • NumberFormatException

Example 1:

Here, using the hashCode(int n) function the Integer value passed is converted into its respective hashcode.

import java.lang.Integer;

public class StudyTonight

    public static void main(String[] args)  
        int hv1 = Integer.hashCode(27); //generate the hashcode of the passed argument
        int hv2 = Integer.hashCode(81); 
        System.out.println("Hash code Value is: " + hv1); 
        System.out.println("Hash code Value is: " + hv2);

Hash code Value is: 27
Hash code Value is: 81

Example 2:

Here is a user-defined example where anyone using this code can put a value of his choice and get the equivalent hash code.

import java.util.Scanner; 

public class StudyTonight
    public static void main(String[] args)
         System.out.print("Enter the value: ");  
         Scanner sc = new Scanner(;         
         Integer i = sc.nextInt();  
         int hv = Integer.hashCode(i);  // Returning hash code value for this object
         System.out.println("Hash code is: " + hv);
      catch(Exception e)
        System.out.println("Invalid Input!!");

Enter the value: 545
Hash code is: 545
Enter the value: mohit
Invalid Input!!

Live Example:

Here, you can test the live code example. You can execute the example for different values, even can edit and write your examples to test the Java code.