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Java Enum hashCode() method with example

Enum Class hashCode() method: Here, we are going to learn about the hashCode() method of Enum Class with its syntax and example.
Submitted by Preeti Jain, on December 06, 2019

Enum Class hashCode() method

• hashCode() method is available in java.lang package.
• hashCode() method is used to retrieve the hashcode for this enum constant.
• 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 is a final method, it does not override in child class.
• hashCode() method does not throw an exception at the time of returning hashcode of the enum constants.

Syntax:

    public final int hashCode();

Parameter(s):

• It does not accept any parameter.

Return value:

The return type of this method is int, it returns the hashcode of for this enum constants and hashcode is of integer type.

Example:

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

enum Month{
    
    JAN,FEB,MAR,APR,MAY;
}

public class HashCode {
    public static void main(String args[]){
        
        // By using hashcode() method is to get the enum
        // hashcode of the given enum constants
        int h1 = Month.JAN.hashCode();
        int h2 = Month.FEB.hashCode();
        int h3 = Month.MAR.hashCode();
        int h4 = Month.APR.hashCode();
        int h5 = Month.MAY.hashCode();
        
        System.out.println("Display Hashcode :");
        
        System.out.println("Month.JAN.hashCode() "+ " "+ h1);
        System.out.println("Month.FEB.hashCode()"+ " "+ h2);
        System.out.println("Month.MAR.hashCode()"+ " "+ h3);
        System.out.println("Month.APR.hashCode()"+ " "+ h4);
        System.out.println("Month.MAY.hashCode()"+ " "+ h5);       
    }     
}

Output

Display Hashcode :
Month.JAN.hashCode()  1785210046
Month.FEB.hashCode() 1552787810
Month.MAR.hashCode() 1361960727
Month.APR.hashCode() 739498517
Month.MAY.hashCode() 125130493