Bagaimana untuk mencari bilangan hari dalam bulan tertentu dalam tahun tertentu di Jawa?

public int getActualMaximum(int field)

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");
      }
   }
}

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