The files must be named as follows: <LastNameFirstNameDateDriver.java>. Example:

Question

The files must be named as follows: <LastNameFirstNameDateDriver.java>.

Example: DeweyKenDateDriver.java (driver program)

Date.java (Date class file)

Overall Requirements
Create a class named Date that stores date values and prints out the date in either a pure numeric format or a name and number format (see sample session for format details).

Date.java class file
· Date objects should store the date in two int instance variables ─ day and month, and it should include the String instance variable, error, initialized with null.
Implement a 1-parameter Date constructor that receives a dateStr string parameter and performs complete error checking on the given dateStr value. The Date constructor is the entity that’s responsible for date error checking. That way, if a Date object is instantiated and if there are no errors, then you’re guaranteed that the Date object holds a legitimate date value. If any kind of error occurs, change the value of the error instance variable to a non-null string value, using an appropriate concatenation of a string constant, input substring, and/or API exception message.
Constructors use the same exception handling rules as methods: In a try block, include the parsing of the month and day substrings and other error-checking logic that will not work if parsing fails.
· Take into account the actual number of days in each month, but assume that there are always 28 days in February.
· To extract day and month numbers from the given date string, use String’s indexOf method to find the location of the slash character, and String’s substring method to extract month and day substrings from the input string.
· Include a method for printing the date with a numeric format. Use the zero-pad flag in a printf method call to get exactly two digits for each month and day.
· Include a method for printing the date with an alphabetic format.
Include a getError method which returns the value of the error instance variable.

LastNameFirstNameDateDriver.java class file

In your driver class, include a loop that repeatedly:
· Asks the user to enter a date or “q†to quit.
· If the entry is not “qâ€, instantiate a Date object.
· If the error variable is null:
Print the date using numeric format.
Print the date using alphabetic format.
Otherwise, print the value of the error variable.

Comments / Flow Chart / Pseudocode / Style
Comments are REQUIRED; flow charts and Pseudocode are NOT REQUIRED.
Proper coding style is REQUIRED. Refer to the JavaCodingStyle.doc in Doc Sharing for more information.

Sample Session:

Enter a date in the form mm/dd ("q" to quit): 5/2
05/02
May 2
Enter a date in the form mm/dd ("q" to quit): 05/02
05/02
May 2
Enter a date in the form mm/dd ("q" to quit): 52
Invalid date format – 52
Enter a date in the form mm/dd ("q" to quit): 5.0/2
Invalid format - For input string: "5.0"
Enter a date in the form mm/dd ("q" to quit): 13/2
Invalid month – 13
Enter a date in the form mm/dd ("q" to quit): 2/x
Invalid format - For input string: "x"
Enter a date in the form mm/dd ("q" to quit): 2/30
Invalid day – 30
Enter a date in the form mm/dd ("q" to quit): 2/28
02/28
February 28
Enter a date in the form mm/dd ("q" to quit): q

Explanation / Answer

100% executable // Date.java public class Date { // Date objects should store the date in two int instance variables - day and month, // and it should include the String instance variable, error, initialized with null. private int day = -1; private int month = -1; private String error = null; private String errMsg = null; private int[] daysPerMonth = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; private String[] alphaMonth = {"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"}; // Implement a 1-parameter Date constructor that receives a dateStr string parameter // and performs complete error checking on the given dateStr value. public Date(String dateStr) { int d1 = 0; int d2 = 0; int m1 = 0; int m2 = 0; int len = 0; if (dateStr == null ) errMsg = "Date Error: Parameter dateStr is null."; else if (dateStr.length() < 3) errMsg = "Date Error: Parameter dateStr is too short. dateStr = "+dateStr; else try { len = dateStr.length(); errMsg = "Date Error: Parameter dateStr does not contain the / separator. dateStr = " + dateStr; int pos = dateStr.indexOf("/"); if ( pos < 0 ) throw new Exception("String does not contain a / token."); errMsg = "Date Error: Parameter dateStr does not contain a month. dateStr = " + dateStr; if ( pos+2 0 ) d2 = Integer.valueOf(dateStr.substring(pos-1, pos)); try { if ( pos > 1 ) { d1 = Integer.valueOf(dateStr.substring(pos-2, pos-1)); day = d1*10 + d2; } } finally { if ( d1 < 1) day = d2; } if (( day < 1 ) || (day > 31)) throw new Exception("Day is invalid."); errMsg = "Date Error: Parameter dateStr has an invalid month. dateStr = " + dateStr; int days = daysPerMonth[month-1]; errMsg = "Date Error: Parameter dateStr has an invalid day for the month. dateStr = " + dateStr; if ( day > days ) throw new Exception("Day of month is too big."); } catch (Exception e) { error = errMsg+" "+e.getMessage()+" "; } } // Include a method for printing the date with a numeric format. // Use the zero-pad flag in a printf method call to get exactly two digits for each month and day. public void printNumericDate() { System.out.printf("The date is d/d ", day, month); } //Include a method for printing the date with an alphabetic format. public void printDdMon() { System.out.println(String.valueOf(day)+" "+ alphaMonth[month-1]); } public void printMonDd() { System.out.println(alphaMonth[month-1]+" "+String.valueOf(day)); } // Include a getError method which returns the value of the error instance variable. public String getError() { return error; } } // ErinDateDriver.java import javax.swing.JOptionPane; public class ErinDateDriver { public static void main(String args[]) { String quit = "q"; boolean again = true; String error = null; String dateStr = null; String msg = " Enter a date in DD/MM format or enter 'q' to quit. "; while (again) { dateStr = JOptionPane.showInputDialog(msg); if ((dateStr != null) && (dateStr.length() > 0)) { if (!dateStr.equalsIgnoreCase(quit)) { Date d = new Date(dateStr); error = d.getError(); if (error == null) { d.printNumericDate(); d.printDdMon(); d.printMonDd(); System.out.println(""); } else System.out.println(error); } else again = false; } else JOptionPane.showMessageDialog(null, msg); } } } If the code becomes compact here, you can also take the code from online java compiler. I stored it there for you. http://ideone.com/xAkLsl Dont forget to rate. Cheers!!!

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