How to find the number of days in a certain month of a specific year in Java?

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

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