Calendar Functions in Java

The java.util.calendar class provides the calendar functions in Java. Is an abstract class that provides methods for converting between a specific instant in time and a set of calendar fields such as YEAR, MONTH, DAY_OF_MONTH, HOUR, and so on, and for manipulating the calendar fields, such as getting the date of the next week.

Following are the calendar functions in Java −

Let us now see an example of the equals() method.

The java.util.Calendar.equals() method compares this Calendar to the specified Object −

Example

import java.util.*;
public class Demo {
   public static void main(String[] args) {
      // create two calendars
      Calendar cal = Calendar.getInstance();
      // specify a date for one of them
      Calendar cal2 = new GregorianCalendar(2011, 04, 29);
      // compare the two calendars.
      boolean b = cal.equals(cal2);
      // print result
      System.out.println("Calendars are equal :" + b);
   }
}

Output

Calendars are equal :false

Let us see another example wherein we are getting the first day of week. The java.util.Calendar.getFirstDayOfWeek() method returns the first day of the week.

Example

import java.util.*;
public class Demo {
   public static void main(String[] args) {
      // create a new calendar
      Calendar cal = Calendar.getInstance();
      // print the first day of the week
      System.out.println("First day 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 is :1
Sunday