A GregorianCalendar is a concrete subclass of Calendar class and it provides the standard calendar system used by most of the world. In Java, this GregorianCalendar can handle both the Gregorian calendar as well as Julian calendar. We can determine or find the number of days in a month of a particular year by using the getActualMaximum() method of GregorianCalendar class. This method returns the maximum value that the GregorianCalendar field can have. The parameter can be any field of a Calendar class.
Syntax
public int getActualMaximum(int field)
Example
import java.util.*;
public class NoOfDaysInAMonthOfAYearTest {
public static void main(String []args) {
for (int i = 2000; i < 2018; i++) {
Calendar calendar = new GregorianCalendar(i, Calendar.FEBRUARY, 1);
int numberOfDays = calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
System.out.println("February " + i + ": " + numberOfDays + " days");
}
}
}输出
February 2000: 29 days February 2001: 28 days February 2002: 28 days February 2003: 28 days February 2004: 29 days February 2005: 28 days February 2006: 28 days February 2007: 28 days February 2008: 29 days February 2009: 28 days February 2010: 28 days February 2011: 28 days February 2012: 29 days February 2013: 28 days February 2014: 28 days February 2015: 28 days February 2016: 29 days February 2017: 28 days
