Calendar hashCode() Method in Java with Examples

The hashCode() method in Calendar class is used to return the hash code for this Calendar Object.
Syntax:

public int hashCode()

Parameters: The method does not take any parameters.
Return Value: The method returns the hash code value for this calendar object..
Below programs illustrate the working of hashCode() Method of Calendar class: 
Example 1:

Java

// Java code to illustrate
// hashCode() method

import java.util.*;

public class Calendar_Demo {
    public static void main(String args[])
    {
        // Creating a calendar object
        Calendar calndr = Calendar.getInstance();

        // Displaying the current calendar
        System.out.println("The time on"
                           + " Calendar shows: "
                           + calndr.getTime());

        // Getting the hash code
        int hash_code = calndr.hashCode();
        System.out.println("The hash code "
                           + "for this calendar is: "
                           + hash_code);
    }
}

Output:

The time on Calendar shows: Wed Feb 20 15:55:22 UTC 2019
The hash code for this calendar is: 194416203

Example 2:

Java

// Java code to illustrate
// hashCode() method

import java.util.*;

public class Calendar_Demo {
    public static void main(String args[])
    {
        // Creating a calendar
        Calendar calndr
            = new GregorianCalendar(2018, 6, 10);

        // Displaying the current calendar
        System.out.println("The time on"
                           + " Calendar shows: "
                           + calndr.getTime());

        // Getting the hash code
        int hash_code = calndr.hashCode();
        System.out.println("The hash code "
                           + "for this calendar is: "
                           + hash_code);
    }
}

Output:

The time on Calendar shows: Tue Jul 10 00:00:00 UTC 2018
The hash code for this calendar is: -2123101761

Reference: https://docs.oracle.com/javase/8/docs/api/java/util/Calendar.html#hashCode–