DateParser

DateParser.java

import java.lang.Exception;
import java.util.Scanner;
import java.util.StringTokenizer;

public class DateParser {

	public static void main(String[] args) throws Exception {

		while (true) {

			try {
				String s;

				System.out.println("Enter m/d/y format: ");

				Scanner k = new Scanner(System.in);

				s = k.next();

				StringTokenizer tk = new StringTokenizer(s, "/");

				if (tk.countTokens() < 3) {
					throw new EntriesException("Not enough entries.");
				}

				String month = tk.nextToken();
				String day = tk.nextToken();
				String year = tk.nextToken();

				s = formatDate(month, day, year);

				System.out.println(s);

				break;

			} catch (Exception e) {

				System.out.println(e.getMessage());

			}

		}

	}

	private enum Months {
		January, February, March, April, May, June, July, August, September, October, November, December
	};

	public static String formatDate(String month, String day, String year)
			throws Exception {

		int m, d, y;

		try {

			m = Integer.parseInt(month);

			if (m < 1 || m > 12) {
				throw new MonthException(month);
			}

			month = Months.values()[m].toString();

		} catch (Exception e) {

			throw new MonthException(month);

		}

		try {

			d = Integer.parseInt(day);

			if (d < 1 || d > 31) {
				throw new DayException(day);
			}

		} catch (Exception e) {
			throw new DayException(day);
		}

		try {

			y = Integer.parseInt(year);

			if (y < 1000 || y > 3000)
				throw new YearException(day);

		} catch (Exception e) {
			throw new YearException(day);
		}

		return String.format("%s %d, %d", month, d, y);

	}

}

DayException.java

public class DayException extends Exception {

	/**
	 * 
	 */
	private static final long serialVersionUID = 3300289856005540808L;
	private String s;

	public DayException(String s) throws Exception {
		super(s);
		this.s = s;
	}

	@Override
	public String getMessage() {
		return "Please enter a day between 1 and 31";
	}

	public String getDay() {
		return s;
	}

}

EntriesException.java

public class EntriesException extends Exception {

	/**
	 * 
	 */
	private static final long serialVersionUID = 3300289856005540808L;
	private String s;

	public EntriesException(String s) throws Exception {
		super(s);
		this.s = s;
	}

	@Override
	public String getMessage() {
		return "Not enough entries.";
	}

	public String getNumber() {
		return s;
	}

}

gistfile1.txt

package Date;
import java.util.Scanner;
import java.util.StringTokenizer;
 
public class DateParser {
 
        public static void main(String[] args) throws DayException, MonthException, YearException{
                String[] months = {"January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"};
                Integer month,day,year;
                Scanner input = new Scanner(System.in);
                while(true){
                        try{
                                System.out.println("Please enter your date in the format month/day/year");
                                String date = input.nextLine();
                                StringTokenizer st = new StringTokenizer(date, "/");
                                month = Integer.parseInt(st.nextToken());
                                day = Integer.parseInt(st.nextToken());
                                year = Integer.parseInt(st.nextToken());
                                if (month < 1 || month > 12){
                                        throw new MonthException();
                                }
                                if(day < 1 || day > 31){
                                        throw new DayException();
                                }
                                if(year < 1000 || year > 3000){
                                        throw new YearException();
                                }
                                System.out.println(months[month-1] + " " + day + ", " + year);
                        }
                        catch (MonthException e){
                                System.out.println(e.getMessage());
                        }
                        catch(DayException e){
                                System.out.println(e.getMessage());
                        }
                        catch(YearException e){
                                System.out.println(e.getMessage());
                        }
               
               
                        }
        }
 
 
}
 
 
package Date;
 
public class DayException extends Exception{
        public DayException(){
                super();
        }
       
        @Override
        public String getMessage(){
                String s = "Please enter a day between 1 and 31";
                return s;
        }
       
}
 
package Date;
 
public class MonthException extends Exception{
        public MonthException(){
                super();
        }
       
        @Override
        public String getMessage(){
                String s = "Please enter a month between 1 and 12";
                return s;
        }
       
}
 
package Date;
 
public class YearException extends Exception{
       
        public YearException(){
                super();
        }
       
        @Override
        public String getMessage(){
                String s = "Please enter a year between 1000 and 3000";
                return s;
        }
       
}

MonthException.java

public class MonthException extends Exception {

	/**
	 * 
	 */
	private static final long serialVersionUID = 3300289856005540808L;
	private String s;

	public MonthException(String s) throws Exception {
		super(s);
		this.s = s;
	}

	@Override
	public String getMessage() {
		return "Month must be between 1 and 12";
	}

	public String getMonth() {
		return s;
	}

}

YearException.java

public class YearException extends Exception {

	/**
	 * 
	 */
	private static final long serialVersionUID = 3300289856005540808L;
	private String s;

	public YearException(String s) throws Exception {
		super(s);
		this.s = s;
	}

	@Override
	public String getMessage() {
		return "Years must be between 1000 and 3000";
	}

	public String getYear() {
		return s;
	}

}