Thread: Problems With Throwing Exceptions in Program-Help Appreciated

Below is the code that I have now, there are some errors but I was wondering if you guys could offer me some guidance to finalize this program so that it is not as open ended. I do not really know where to start, and I have been stuck on this program for weeks. Thank you so much!

 
 public static void main(String[] args) throws DayException {
        Scanner console = new Scanner(System.in);
        int monthValue;
        int dayValue;
        int yearValue;
        int[] daysOfMonth = {12, 31, 28, 31, 30, 31, 30, 31, 30, 31};
        final String[] monthNames
                = new String[]{"Jan", "Feb", "March", "April", "May",
                    "Jun", "July", "Aug", "Sept", "Oct", "Nov", "Dec"};
 
        while (true) {
            // Gets date from the user.
            System.out.print("Enter a date in the format mm dd yyyy: ");
            monthValue = console.nextInt();
            dayValue = console.nextInt();
            yearValue = console.nextInt();
 
             // Examine the month, day, year. 
             //Value for the month, day, year that is entered.
             // If it is not, throw an exception.  
 
            try {
              if (monthValue < 1 && monthValue > 12) 
                  throw new MonthException();   
            }
               catch (MonthException e) {
                 System.out.println(e.getMessage());
            }
 
             try {
               if (dayValue < 1 && dayValue > 31 )
                   throw new DayException();
           }
               catch (DayException e) {
                System.out.println(e.getMessage());
            }
 
           try {
               if (yearValue <= 1000 && yearValue >= 3000)
                   throw new YearException();
           }
           catch (YearException e) {
                System.out.println(e.getMessage());
 
 
            console.nextLine();  // To flush input buffer.
            System.out.print("Enter another date? (yes/no) ");
            String response = console.nextLine();
            if (!response.toUpperCase().equals("Yes")) {
                System.exit(0);
            }
        }
 
class MonthException extends RuntimeException {
 
    public MonthException() {
        super("Invalid month value entered. Try again.");
      }
    }
   }
 }
 
class YearException extends RuntimeException {
 
    public YearException() {
        super("Invalid year value entered. Try again.");
        }
    }
 
class DayException extends RuntimeException {
 
     public DayException() {
         super("Invalid day value entered. Try again.");
        }
    }
 }

Yes. I would like the program to display: "The date you entered is November 20, 1981." When you enter: mm dd yyyy: 11 20 1981 (When a correct date is entered.) So basically it converts dates from numerical month/day/year format to normal "month day, year" format.

Then when a wrong date is entered I want it to throw an exception and state an error message.

   public static void main(String[] args) throws DayException {
        Scanner console = new Scanner(System.in);
        int monthValue;
        int dayValue;
        int yearValue;
        int[] daysOfMonth = {12, 31, 28, 31, 30, 31, 30, 31, 30, 31};
        final String[] monthNames
                = new String[]{"Jan", "Feb", "March", "April", "May",
                    "Jun", "July", "Aug", "Sept", "Oct", "Nov", "Dec"};
 
        while (true) {
            // Gets date from the user.
            System.out.print("Enter a date in the format mm dd yyyy: ");
            monthValue = console.nextInt();
            dayValue = console.nextInt();
            yearValue = console.nextInt();
 
             // Examine the month, day, year. 
             //Value for the month, day, year that is entered.
             // If it is not, throw an exception.  
 
            try {
              if (monthValue < 1 && monthValue > 12) 
                  throw new MonthException();   
            }
               catch (MonthException e) {
                 System.out.println(e.getMessage());
            }
 
             try {
               if (dayValue < 1 && dayValue > 31 )
                   throw new DayException();
           }
               catch (DayException e) {
                System.out.println(e.getMessage());
            }
 
           try {
               if (yearValue <= 1000 && yearValue >= 3000)
                   throw new YearException();
           }
           catch (YearException e) {
                System.out.println(e.getMessage());
 
 
            console.nextLine();  // To flush input buffer.
            System.out.print("Enter another date? (yes/no) ");
            String response = console.nextLine();
            if (!response.toUpperCase().equals("Yes")) {
                System.exit(0);
            }
        }          
        }
    }
 private static class MonthException extends RuntimeException {
 
    public MonthException() {
       super("Invalid month value entered, month exceeds excepted value."
               + "Please try again.");
        }
        }
    }
 
class YearException extends RuntimeException {
 
    public YearException() {
        super("Values between 1000 and 3000 are only allowed,"
                + " Please try again.");
        }
    }
 
class DayException extends RuntimeException {
 
     public DayException() {
         super("Invalid day value entered, only accept values between 1 and 31."
                 + " Please try again.");
        }
    }

I do not know where to start...

this is what it displays"
Enter a date in the format mm dd yyyy: 13 111 111
Enter a date in the format mm dd yyyy: 22 332 232
Enter a date in the format mm dd yyyy: "

Whenever I enter a data set that is false, it does not throw the exception......do not know why it does not...

Here it is:
Thank you for your help!

 
    public static void main(String[] args) {
        Scanner console = new Scanner(System.in);
        int monthValue;
        int dayValue;
        int yearValue;
        int[] daysOfMonth = {12, 31, 28, 31, 30, 31, 30, 31, 30, 31};
        final String[] monthNames
                = new String[]{"Jan", "Feb", "March", "April", "May",
                    "Jun", "July", "Aug", "Sept", "Oct", "Nov", "Dec"};
 
        while (true) {
            // Gets date from the user.
            System.out.print("Enter a date in the format mm dd yyyy: ");
            monthValue = console.nextInt();
            dayValue = console.nextInt();
            yearValue = console.nextInt();
 
            // Examine the month, day, year. 
            // Value for the month, day, year that is entered.
            // If it is not the range of the accepted value, throw an exception.  
 
           try { // MonthException
               if (monthValue < 1 && monthValue > 12) 
                  throw new MonthException();   
            }
               catch (MonthException e) {
                 System.out.println(e.getMessage());
            }
 
           try { // Day Exception
               if (dayValue < 1 && dayValue > 31 )
                   throw new DayException();
           }
               catch (DayException e) {
                System.out.println(e.getMessage());
            }
 
           try { // Year Exception
               if (yearValue <= 1000 && yearValue >= 3000)
                   throw new YearException();
           }
               catch (YearException e) {
                System.out.println(e.getMessage());
           }
            try { // Leap Year
               if ((yearValue % 4 == 0) && (dayValue > 31)) 
                   throw new DateException();
            }
               catch (DateException e) {
                System.out.println(e.getMessage());   
               }
 
            console.nextLine();  // To flush input buffer.
            System.out.print("Enter another date? (yes/no) ");
            String response = console.nextLine();
            if (!response.toUpperCase().equals("no")) {
                System.exit(0);
 
        }          
        }
    }
 private static class MonthException extends RuntimeException {
 
    public MonthException() {
       super("Invalid month value entered, month exceeds excepted value."
               + "Please try again.");
        }
        }
 
private static class DateException extends RuntimeException {
 
    public DateException() {
        super("Entered date is a leap year.");
        }
    }
    }
 
class YearException extends RuntimeException {
 
    public YearException() {
        super("Values between 1000 and 3000 are only allowed,"
                + " Please try again.");
        }
    }
class DayException extends RuntimeException {
 
     public DayException() {
         super("Invalid day value entered, only accept values between 1 and 31."
                 + " Please try again.");
        }
    }

my bad, sorry. If this does not work, then I might have a bug in the program........

 
import java.util.Scanner;
public class W10Assign9 {
 
    public static void main(String[] args) {
        Scanner console = new Scanner(System.in);
        int monthValue;
        int dayValue;
        int yearValue;
        int[] daysOfMonth = {12, 31, 28, 31, 30, 31, 30, 31, 30, 31};
        final String[] monthNames
                = new String[]{"Jan", "Feb", "March", "April", "May",
                    "Jun", "July", "Aug", "Sept", "Oct", "Nov", "Dec"};
 
        while (true) {
            // Gets date from the user.
            System.out.print("Enter a date in the format mm dd yyyy: ");
            monthValue = console.nextInt();
            dayValue = console.nextInt();
            yearValue = console.nextInt();
 
            // Examine the month, day, year. 
            // Value for the month, day, year that is entered.
            // If it is not the range of the accepted value, throw an exception.  
 
           try { // MonthException
               if (monthValue < 1 && monthValue > 12) 
                  throw new MonthException();   
            }
               catch (MonthException e) {
                 System.out.println(e.getMessage());
            }
 
           try { // Day Exception
               if (dayValue < 1 && dayValue > 31 )
                   throw new DayException();
           }
               catch (DayException e) {
                System.out.println(e.getMessage());
            }
 
           try { // Year Exception
               if (yearValue <= 1000 && yearValue >= 3000)
                   throw new YearException();
           }
               catch (YearException e) {
                System.out.println(e.getMessage());
           }
            try { // Leap Year
               if ((yearValue % 4 == 0) && (dayValue > 31)) 
                   throw new DateException();
            }
               catch (DateException e) {
                System.out.println(e.getMessage());   
               }
 
            console.nextLine();  // To flush input buffer.
            System.out.print("Enter another date? (yes/no) ");
            String response = console.nextLine();
            if (!response.toUpperCase().equals("no")) {
                System.exit(0);
 
        }          
        }
    }
 private static class MonthException extends RuntimeException {
 
    public MonthException() {
       super("Invalid month value entered, month exceeds excepted value."
               + "Please try again.");
        }
        }
 
private static class DateException extends RuntimeException {
 
    public DateException() {
        super("Entered date is a leap year.");
        }
    }
    }
 
class YearException extends RuntimeException {
 
    public YearException() {
        super("Values between 1000 and 3000 are only allowed,"
                + " Please try again.");
        }
    }
class DayException extends RuntimeException {
 
     public DayException() {
         super("Invalid day value entered, only accept values between 1 and 31."
                 + " Please try again.");
        }
    }

I changed it to "(monthValue < 1 || monthValue > 12)" Sorry about that.

import java.util.Scanner;
public class W10Assign9 {
 
    public static void main(String[] args) {
        Scanner console = new Scanner(System.in);
        int monthValue;
        int dayValue;
        int yearValue;
        int[] daysOfMonth = {12, 31, 28, 31, 30, 31, 30, 31, 30, 31};
        final String[] monthNames
                = new String[]{"Jan", "Feb", "March", "April", "May",
                    "Jun", "July", "Aug", "Sept", "Oct", "Nov", "Dec"};
 
        while (true) {
            // Gets date from the user.
            System.out.print("Enter a date in the format mm dd yyyy: ");
            monthValue = console.nextInt();
            dayValue = console.nextInt();
            yearValue = console.nextInt();
 
            // Examine the month, day, year. 
            // Value for the month, day, year that is entered.
            // If it is not the range of the accepted value, throw an exception.  
 
           try { // MonthException
               if (monthValue < 1 || monthValue > 12) 
                  throw new MonthException();   
            }
               catch (MonthException e) {
                 System.out.println(e.getMessage());
            }
 
           try { // Day Exception
               if (dayValue < 1 && dayValue > 31 )
                   throw new DayException();
           }
               catch (DayException e) {
                System.out.println(e.getMessage());
            }
 
           try { // Year Exception
               if (yearValue <= 1000 && yearValue >= 3000)
                   throw new YearException();
           }
               catch (YearException e) {
                System.out.println(e.getMessage());
           }
            try { // Leap Year
               if ((yearValue % 4 == 0) && (dayValue > 31)) 
                   throw new DateException();
            }
               catch (DateException e) {
                System.out.println(e.getMessage());   
               }
 
            console.nextLine();  // To flush input buffer.
            System.out.print("Enter another date? (yes/no) ");
            String response = console.nextLine();
            if (!response.toUpperCase().equals("no")) {
                System.exit(0);
 
        }          
        }
    }
 private static class MonthException extends RuntimeException {
 
    public MonthException() {
       super("Invalid month value entered, month exceeds excepted value."
               + "Please try again.");
        }
        }
 
private static class DateException extends RuntimeException {
 
    public DateException() {
        super("Entered date is a leap year.");
        }
    }
    }
 
class YearException extends RuntimeException {
 
    public YearException() {
        super("Values between 1000 and 3000 are only allowed,"
                + " Please try again.");
        }
    }
class DayException extends RuntimeException {
 
     public DayException() {
         super("Invalid day value entered, only accept values between 1 and 31."
                 + " Please try again.");
        }
    }

No. It still does not convert the date that I input, sigh, this is really troublesome it still give me this
"Enter a date in the format mm dd yyyy: 12 11 1995, Enter another date? (yes/no) no"

Thank you!

This is what the output should look like:

"Please enter a date in the format mm dd yyyy: 12 99 2013
The day value is dubious. Please try again.

Please enter a date in the format mm dd yyyy: 44 2 2012
That month is incorrect. Please try again.

Please enter a date in the format mm dd yyyy: 11 20 1981
The date you entered is November 20, 1981. "

What sort of conversion has to be done and where should I put it?

what is ur question ??? plz tell me clearly i promise u to solve ur problem up to my maximum extend.