Question

Write program that prompts the user to enter a person's date of birth in numeric form such as 8-27-1980. The program then outputs the date of birth in the form: August 27, 1980. Your program must contain at least two exception classes: invalidDay and invalidMonth. If the user enters an invalid value for day, then the program should throw and catch an invalidDay object. Similar conventions for the invalid values of month and year. (Note that your program must handle a leap year.)

Answer 1

import java.util.Scanner;

class InvalidDayException extends RuntimeException {
   /**
   * @param aMsg
   */
   public InvalidDayException(String aMsg) {
       super(aMsg);
   }

}

class InvalidMonthException extends RuntimeException {
   /**
   * @param aMsg
   */
   public InvalidMonthException(String aMsg) {
       super(aMsg);
   }

}

public class DateTest {
   private static int getDays(int mm, int aYy) {
       int res = -1;
       switch (mm) {
       case 1:
           res = 31;
           break;
       case 2:
           if (isLeap(aYy))
               res = 29;
           else
               res = 28;
           break;
       case 3:
           res = 31;
           break;
       case 4:
           res = 30;
           break;
       case 5:
           res = 31;
           break;
       case 6:
           res = 30;
           break;
       case 7:
           res = 31;
           break;
       case 8:
           res = 31;
           break;
       case 9:
           res = 30;
           break;
       case 10:
           res = 31;
           break;
       case 11:
           res = 30;
           break;
       case 12:
           res = 31;
           break;

       }
       return res;
   }

   private static boolean isLeap(int year) {
       boolean leap = false;
       // if any year is divisable by 4 than there are many chances for leap
       // year except few
       if (year % 4 == 0) {
           // if it is divisable by 100 than it shoud also divisable by 400
           // like 2000 etc
           if (year % 100 == 0) {
               // year is divisible by 400, so the year is a leap year
               if (year % 400 == 0)
                   leap = true;
               else
                   leap = false;
           } else
               leap = true;
       } else
           leap = false;
       return leap;
   }

   public static void main(String[] args) {
       Scanner sc = new Scanner(System.in);
       String arr[] = { " ", "January", "February", "March", "April", "May", "June", "July", "August", "September",
               "October", "November", "December" };
       System.out.println("Enter date in the format(dd-mm-yyyy)");
       String d = sc.next();
       int day = Integer.parseInt(d.split("-")[1]);
       int month = Integer.parseInt(d.split("-")[0]);
       int year = Integer.parseInt(d.split("-")[2]);
       int days = getDays(month, year);
       if (day < 1 || day > days) {
           throw new InvalidDayException("Invalid day " + day);
       }
       if (month < 1 || month > 12) {
           throw new InvalidMonthException("Invalid month " + month);

       }
       System.out.println(arr[month] + " " + day + ", " + year);
   }
}

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