Java Integer hashCode() Method

The hashCode() method is a Java Integer class method which returns the hash code for the given inputs. There are two different types of Java hashCode() method which can be differentiated depending on its parameter.

These are:

Java Integer hashCode() Method
Java Integer hashCode(int value) Method

hashCode() Method

The hashCode() is a method of Java Integer Class which determines the hash code for a given Integer. It overrides hashCode in class Object. By default, this method returns a random integer that is unique for each instance.

hashCode(int value) Method

The hashCode(int value) is an inbuilt Java Integer Class method which determines a hash code for a given int value. This method is compatible with Integer.hashCode().

Syntax:

Following is the declaration of hashCode() method:

public int hashCode()
public static int hashCode(int value)

Parameter:

DataType	Parameter	Description
int	value	It is an int value which determines the hash code.

Returns:

Method	Returns
hashCode()	It returns a hash code value for this object, equal to the primitive int value represented by this Integer object.
hashCode(int value)	It returns a hash code value for an int value specified in the method argument.

Exceptions:

InputMismatchException, NumberFormatException

Compatibility Version:

hashCode()	Java 1.2 and above
hashCode(int value)	Java 1.8 and above

Example 1

public class IntegerHashCodeExample1 {
	public static void main(String[] args)
    {
        //Create integer object
        Integer i = new Integer("155");
        //Returned hash code value for this object 
        int hashValue = i.hashCode();
        System.out.println("Hash code Value for object is: " + hashValue);
    }
}

Test it Now

Output:

Hash code Value for object is: 155

Example 2

import java.util.Scanner;
public class IntegerHashCodeExample2 {
	public static void main(String[] args) {
	  //Create integer object
	  System.out.print("Enter the desired input value: ");
	  Scanner readInput = new Scanner(System.in);       
        Integer i = readInput.nextInt();
        readInput.close();
        // Returned hash code value for this object 
        int hashValue = i.hashCode();
        System.out.println("Hash code Value for object is: " + hashValue);
        }
}

Output:

1.	Enter the desired input value: 4343
Hash code Value for object is: 4343

2.	Enter the desired input value: abcd
Exception in thread "main" java.util.InputMismatchException
	at java.util.Scanner.throwFor(Scanner.java:864)
	at java.util.Scanner.next(Scanner.java:1485)
	at java.util.Scanner.nextInt(Scanner.java:2117)
	at java.util.Scanner.nextInt(Scanner.java:2076)
	at  myPackage.IntegerHashCodeExample1.main(IntegerHashCodeExample1.java:11)

Example 3

public class IntegerHashCodeExample3 {
	public static void main(String[] args) {
		Integer i = new Integer("abcd");	    
	      // returns a hash code value for this object
	      int result = i.hashCode();
	      System.out.println("Hash Code Value= " + result);
    }
}

Test it Now

Output:

Exception in thread "main" java.lang.NumberFormatException: For input string: "abcd"
	at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
	at java.lang.Integer.parseInt(Integer.java:580)
	at java.lang.Integer.(Integer.java:867)
	at myPackage.IntegerHashCodeExample3.main(IntegerHashCodeExample3.java:5)

Example 4

// Example of hashCode(int value)
public class IntegerHashCodeExample4 {
	public static void main(String[] args)
    {
        int hashValue = Integer.hashCode(155);
        System.out.println("Hash code Value for object is: " + hashValue);
    }
}

Test it Now

Output:

Hash code Value for object is: 155

Example 5

// Example of hashCode(int value)
import java.util.Scanner;
public class IntegerHashCodeExample5 {
	public static void main(String[] args) {
	  //Create integer object
	  System.out.print("Enter the desired input value: ");
	  Scanner readInput = new Scanner(System.in);       
        Integer i = readInput.nextInt();
        readInput.close();
        // Returned hash code value for this object 
        int hashValue = Integer.hashCode(i);
        System.out.println("Hash code Value for object is: " + hashValue);
        }
}

Output:

Enter the desired input value: 4569
Hash code Value for object is: 4569

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Java Integer hashCode() Method

hashCode() Method

hashCode(int value) Method

Syntax:

Parameter:

Returns:

Exceptions:

Compatibility Version:

Example 1

Example 2

Example 3

Example 4

Example 5

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