// Fig. 8.7: Date.java 
// Date class declaration.

public class Date {
   private int month; // 1-12
   private int day; // 1-31 based on month
   private int year; // any year

   private static final int[] daysPerMonth = 
      {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
   
   // constructor: confirm proper value for month and day given the year
   public Date(int month, int day, int year) {
      // check if month in range
      if (month <= 0 || month > 12) {
         throw new IllegalArgumentException(
            "month (" + month + ") must be 1-12");
      }

      // check if day in range for month
      if (day <= 0 || 
         (day > daysPerMonth[month] && !(month == 2 && day == 29))) {
         throw new IllegalArgumentException("day (" + day + 
            ") out-of-range for the specified month and year");
      }

      // check for leap year if month is 2 and day is 29
      if (month == 2 && day == 29 && !(year % 400 == 0 || 
           (year % 4 == 0 && year % 100 != 0))) {
         throw new IllegalArgumentException("day (" + day +
            ") out-of-range for the specified month and year");
      }
   
      this.month = month;
      this.day = day;
      this.year = year;

      System.out.printf("Date object constructor for date %s%n", this);
   } 
   
   // return a String of the form month/day/year
   public String toString() {
      return String.format("%d/%d/%d", month, day, year); 
   } 
} 



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