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Java kalendāra klase ir abstrakta klase, kas nodrošina metodes datuma konvertēšanai starp noteiktu laika momentu un kalendāra lauku kopu, piemēram, MĒNESIS, GADS, STUNDA utt. Tā pārmanto objektu klasi un ievieš salīdzināmo saskarni.

kas ir dubultā java

Java kalendāra klases deklarācija

Apskatīsim java.util.Calendar klases deklarāciju.

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

Kalendāra metožu saraksts

Java kalendāra klases piemērs

 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()); } } 

Izvade:

 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 

Java kalendāra klases piemērs: 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)); } } 

Izvade:

kartes java iterators

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

Java kalendāra klases piemērs: 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()); } } 

Izvade:

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

Java kalendāra klases piemērs: 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); } } 

Izvade:

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

Java kalendāra klases piemērs: 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); } } 

Izvade:

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