Calendar Class in Java

Date and time have become integral parts of our lives. Automating them has always been of priority. Java includes an abstract class to convert dates and time in the form of calendar fields like MONTH, YEAR, HOUR, MINUTES, and so on. This article will give you a deep insight into Java calendar class and the various inbuilt functions present in it. 

Java Calendar class declaration:

To declare the calendar class, we must inherit the Object class and implement the Comparable interface.

public abstract class Calendar extends Object   
implements Serializable, Cloneable, Comparable<Calendar> 

This is the snippet to declare a calendar class.

Java Calendar class methods:

You can work out all these methods with a simple java program.

The program given below returns the first day of the week.

import java.util.*;
public class DFCalendarSample{
   public static void main(String[] args) {
  	Calendar cal = Calendar.getInstance();
      System.out.println("First day of the week is:" + cal.getFirstDayOfWeek());
  	int day = cal.getFirstDayOfWeek();
  	switch (day) {
     	case (1):
            System.out.println("Sunday");
            break;
     	case (2):
            System.out.println("Monday");
            break;
     	case 3:
            System.out.println("Tuesday");
            break;
     	case 4:
            System.out.println("Wednesday");
            break;
     	case 5:
            System.out.println("Thrusday");
            break;
     	case 6:
            System.out.println("Friday");
            break;
     	case 7:
            System.out.println("Saturday");
            break;
  	}
   }
}

Output:

First day of the week is: 1

Sunday

In the same way, you can try all the other built-in methods in the calendar class to obtain the desired results.

Conclusion:

Conversion of date and time has become easier with the help of the calendar class. It also contains numerous other functionalities as listed in the table. This is all about the calendar class in java. I hope this article helps you.