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A classe Java Calendar é uma classe abstrata que fornece métodos para converter datas entre um instante específico no tempo e um conjunto de campos de calendário como MÊS, ANO, HORA, etc. Ela herda a classe Object e implementa a interface Comparable.

Declaração de classe do Calendário Java

Vamos ver a declaração da classe java.util.Calendar.

java int em string

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

Lista de métodos de calendário

Exemplo de classe de calendário Java

 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()); } } 

Saída:

 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 

Exemplo de classe de calendário Java: 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)); } } 

Saída:

np.random.rand

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

Exemplo de classe de calendário Java: 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()); } } 

Saída:

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

Exemplo de classe de calendário Java: 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); } } 

Saída:

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

Exemplo de classe de calendário Java: 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); } } 

Saída:

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