Try month in a leap year : Calendar « Data Type « Java Tutorial

import java.util.Calendar;
import java.util.GregorianCalendar;

public class Main {
  public static void main(String[] argv) throws Exception {

    Calendar cal = new GregorianCalendar(2000, Calendar.FEBRUARY, 1);
    int days = cal.getActualMaximum(Calendar.DAY_OF_MONTH); // 29
  }
}

2.39.Calendar
	2.39.1.	The java.util.Calendar Class
	2.39.2.	Create instance of java.sql.Date from Calendar.getTimeInMillis()
	2.39.3.	Create a Date object using the Calendar class
	2.39.4.	Using the Calendar Class to Display Current Time in Different Time Zones
	2.39.5.	Get day of week
	2.39.6.	Display Day of Week using Java Calendar
	2.39.7.	Display Month of year using Java Calendar
	2.39.8.	Get current date, year and month
	2.39.9.	Get current time information
	2.39.10.	Get the last date of a month
	2.39.11.	Get the last day of a month
	2.39.12.	Display full date time
	2.39.13.	Get time in milliseconds using Java Calendar
	2.39.14.	Get Week of month and year using Java Calendar
	2.39.15.	Construct a Calendar object by using the setTime method
	2.39.16.	To obtain a date part, such as the hour, the month, or the year, use the get method
	2.39.17.	To change a date/time component, use its set method: public void set (int field, int value)
	2.39.18.	Change multiple components at the same time
	2.39.19.	Check for a Leap Year
	2.39.20.	Checking for a Leap Year: using GregorianCalendar
	2.39.21.	Get Days Of The Week for different locale
	2.39.22.	Get the number of days in that month
	2.39.23.	Try month in a leap year