class DateTest {
   public static void main(String[] args) {
      Date d1 = new Date(15, 6, 2005);
      Date d2 = new Date(2005);
      Date d3 = new Date(d1);
      System.out.println("The first day is " + d1);
      System.out.println("Another day is " + d2);
      System.out.println("A copy of the first day is " + d3);
      String climate = d1.expectedTemperature();
      System.out.println("The climate on "
                            + d1 + " is " + climate);
      Date d4 = new Date(30, 5, 2008);
      Date d5 = d4.nextDay();
      Date d6 = d4.nextDay().nextDay();
      System.out.println("Today is " + d4);
      System.out.println("Tomorrow is " + d5);
      System.out.println("The day after that is " + d6);
      Date d7 = new Date(15, 9, 2005);
      Date d8 = new Date(8, 12, 2005);
      Date d9 = Date.later(d7, d8);
      System.out.println("The later date is " + d8);
      Date d10 = new Date(21, 8, 2005);
      Date d11 = new Date(25, 8, 2007);
      System.out.println("sameMonth is " + d10.sameMonth(d11));
      Date d12 = new Date(30, 6, 2005);
      Date d13 = new Date(30, 6, 2005);
      Date d14 = d13;
      System.out.println("d12 == d13 is " + (d12 == d13)
                            + " (expect false)");  
      System.out.println("d13 == d14 is " + (d13 == d14)
                            + " (expect true)"); 
      System.out.println("d12 instanceof Date is "
         + (d12 instanceof Date) + " (expect true)");
      d12 = null;
      System.out.println("After setting to null, "
         + "d12 instanceof Date is " + (d12 instanceof Date));


   }
}  // end of class DateTest

class Date {
   int day;
   int month;
   int year;
   static int[] monthDays = {0, 31, 28, 31, 
      30, 31, 30, 31, 31, 30, 31, 30, 31};
   
   Date(int d, int m, int y) {  // constructor
      day = d;
      month = m;
      year = y;
   }  
   
   Date(int y) {                // another constructor
      year = y;
   }
   
   Date(Date d) {               // copy constructor
      day = d.day;
      month = d.month;
      year = d.year;
   }
   
   public String toString() {
      return day + "/" + month + "/" + year;
   }  // end of toString()
   
   String expectedTemperature() {
      if (month >= 5 && month <= 9)
         return "warm";
      else return "cold";
   }  // end of expectedTemperature()
   
   Date nextDay() {
      Date tomorrow = 
         new Date(day + 1, month, year);
      if (tomorrow.day > monthDays[month]) {
         tomorrow.month++;
         tomorrow.day = 1;
      }
      if (tomorrow.month > 12) {
         tomorrow.year++;
         tomorrow.month = 1;
      }
      return tomorrow;
   }  // end of nextDay()
   
   boolean sameMonth(Date other) {
      if (this.month == other.month)
         return true;
      else return false;
   }  // end of sameMonth()
   
   static Date later(Date d1, Date d2) {
      if (d1.year > d2.year) return d1;
      else if (d1.year < d2.year) return d2;
      else if (d1.month > d2.month) return d1;
      else if (d1.month < d2.month) return d2;
      else if (d1.day > d2.day) return d1;
      else return d2;
   }  // end of later()
      
}  // end of class Date