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Класът Java Calendar е абстрактен клас, който предоставя методи за конвертиране на дата между конкретен момент във времето и набор от календарни полета като МЕСЕЦ, ГОДИНА, ЧАС и т.н. Той наследява класа Object и имплементира интерфейса Comparable.

Декларация на клас Java Calendar

Нека да видим декларацията на класа java.util.Calendar.

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

Списък с календарни методи

Пример за Java Calendar клас

 import java.util.Calendar; public class CalendarExample1 { public static void main(String[] args) { Calendar calendar = Calendar.getInstance(); System.out.println('The current date is : ' + calendar.getTime()); calendar.add(Calendar.DATE, -15); System.out.println('15 days ago: ' + calendar.getTime()); calendar.add(Calendar.MONTH, 4); System.out.println('4 months later: ' + calendar.getTime()); calendar.add(Calendar.YEAR, 2); System.out.println('2 years later: ' + calendar.getTime()); } } 

Изход:

 The current date is : Thu Jan 19 18:47:02 IST 2017 15 days ago: Wed Jan 04 18:47:02 IST 2017 4 months later: Thu May 04 18:47:02 IST 2017 2 years later: Sat May 04 18:47:02 IST 2019 

Пример за Java Calendar клас: get()

 import java.util.*; public class CalendarExample2{ public static void main(String[] args) { Calendar calendar = Calendar.getInstance(); System.out.println('At present Calendar's Year: ' + calendar.get(Calendar.YEAR)); System.out.println('At present Calendar's Day: ' + calendar.get(Calendar.DATE)); } } 

Изход:

 At present Calendar's Year: 2017 At present Calendar's Day: 20 

Пример за клас на Java Calendar: getInstance()

 import java.util.*; public class CalendarExample3{ public static void main(String[] args) { Calendar calendar = Calendar.getInstance(); System.out.print('At present Date And Time Is: ' + calendar.getTime()); } } 

Изход:

 At present Date And Time Is: Fri Jan 20 14:26:19 IST 2017 

Пример за Java Calendar клас: getMaximum()

 import java.util.*; public class CalendarExample4 { public static void main(String[] args) { Calendar calendar = Calendar.getInstance(); int maximum = calendar.getMaximum(Calendar.DAY_OF_WEEK); System.out.println('Maximum number of days in week: ' + maximum); maximum = calendar.getMaximum(Calendar.WEEK_OF_YEAR); System.out.println('Maximum number of weeks in year: ' + maximum); } } 

Изход:

 Maximum number of days in week: 7 Maximum number of weeks in year: 53 

Пример за Java Calendar клас: getMinimum()

 import java.util.*; public class CalendarExample5 { public static void main(String[] args) { Calendar cal = Calendar.getInstance(); int maximum = cal.getMinimum(Calendar.DAY_OF_WEEK); System.out.println('Minimum number of days in week: ' + maximum); maximum = cal.getMinimum(Calendar.WEEK_OF_YEAR); System.out.println('Minimum number of weeks in year: ' + maximum); } } 

Изход:

 Minimum number of days in week: 1 Minimum number of weeks in year: 1