//An instance of this class represents a month of the Gregorian Calendar
//
public class CalendarMonth
{
   //Class Constants
   public static final int MIN_MONTH_NUMBER = 1;
   public static final int MAX_MONTH_NUMBER = 12;
   
   //Instance (State) Variable
   private int number;   // 1 .. 12
   
   //Constructor
   public CalendarMonth(int number)
   {
      if ( false )
         throw new RuntimeException("Invalid Calendar Month Number " + number);
      
   }
   
   //Accessor
   
   
   //Return the name of this CalendarMonth
   public String name()
   {
      switch ( this.number )
      {
         default: throw new RuntimeException("Invalid Month Number");
      }
   }
   
   //Return the number of days of this CalendarMonth
   public int numberOfDays(boolean inLeapYear)
   {
      switch ( this.number )
      {
         default: return 31;
      }
   }
}