What to use in your completed code Get input from file.

Ask user at least a single question and read at least one answer.

Use at least a single method from Math class.

Use at least one overloaded constructor.

Use at least one if-else-if, while, for, and enhanced for loops.

Use methods to pass and return identifiers and objects.

Pass arrays to/from methods.

Use at least a method to sort the array in the project.

Use inheritance and polymorphism.

Use exception handling.

Use input validation.

Pass the input and output files as commandline arguments.

Final Project - Credit card numbers and the case of Mobius Duck In this project, you are assisting an investigation. The investigator asked you to help him determine the validity of credit card numbers located in a case of Mobius Duck, case number 20150510-001.

Your task is to:

Read the data listed below Data to Evaluate from a file.

Evaluate each number to see if they are representing a possible credit card number.

Validate each credit card number to see if they are a valid number.

Store the valid numbers and invalid numbers in a separate array.

Write the contents of validated credit card number array into a file called valid_cards.txt.

Write the invalid credit card number array to a file called invalid_numbers.txt.

Make sure to include the issuer for each group of credit card numbers identified.

Your application should work with any number of credit card entries.

Turn in:

Source code ( .java ) files of all classes and driver class.

Completed UML for application classes.

Flow chart for every method that contains beyond sequential logic flow

. Generated javadocs structure.

Input and output files

Grading: Naming standard followed for project files 2%

Input and output files 2%

Javadoc structure 5%

Project compiled without error 91%

Proper use of internal comments, docstrings, and tags 5%

Self documenting field, identifier, method, static, final, and class identifiers - 5%

Properly validated input and output files - 5%

Properly used arrays to store data - 5%

Correct output calculated by the Luhn algorithm and card number issuer identified 71%

Extra Credit: - Implement the full Issuer IIN Range instead of the simplified list.

How to validate Credit Card Numbers? Most credit card number can be validated using the Luhn algorithm, which is more or a less a glorified Modulo 10 formula!

The Luhn Formula:

Drop the last digit from the number. The last digit is what we want to check against

Reverse the numbers

Multiply the digits in odd positions (1, 3, 5, etc.) by 2 and subtract 9 to all any result higher than 9

Add all the numbers together

The check digit (the last number of the card) is the amount that you would need to add to get a multiple of 10 (Modulo 10)

Luhn Example:

Steps Total

Total Original Number: 4 5 5 6 7 3 7 5 8 6 8 9 9 8 5 5

Drop the last digit: 4 5 5 6 7 3 7 5 8 6 8 9 9 8 5

Reverse the digits: 5 8 9 9 8 6 8 5 7 3 7 6 5 5 4

Multiple odd digits by 2: 10 8 18 9 16 6 16 5 14 3 14 6 10 5 8

Add digits from line above 1 8 9 9 7 6 7 5 5 3 5 6 1 5 8

Add all numbers: 1 8 9 9 7 6 7 5 5 3 5 6 1 5 8 85

Mod 10: (85 + X) modulo 10 = 0 , thus X=5 (last digit of card)

List of credit card number formats

Credit Card Issuer Starts With ( IIN Range ) Length ( Number of digits )

American Express 34, 37 15

Diners Club - Carte Blanche 300, 301, 302, 303, 304, 305 14

Diners Club - International 36 14

Diners Club - USA & Canada 54 16

Discover 6011, 622126 to 622925, 644, 645, 646,

647, 648, 649, 65 16

InstaPayment 637, 638, 639 16

JCB 3528 to 3589 16

Laser 6304, 6706, 6771, 6709 16-19

Maestro 5018, 5020, 5038, 5893, 6304, 6759,

6761, 6762, 6763 16-19

MasterCard 51, 52, 53, 54, 55 16-19

Visa 4 13-16

Visa Electron 4026, 417500, 4508, 4844, 4913, 4917 16

Data to Evaluate

3158539628375348

3337465828248404

3112804683572030

3112804683572033

5435528978467581

6706465468107999

6304362971054667

6706169762827894

6706169762827892

4844104341377697

4913405490886727

4844885754351829

4844885754351822

6371473570875275

6381475006869978

6389057917814806

347100734345549

347100734345543

6011162533805000

6011621663574413

6011824617460743

6011824617460745

6389057917814802

4539318768050385

36880982786892

36845793345501

36661154562232

36661154562234

5893329089846994

6761680165952016

6763100400984029

6763100400984022

5127043299122389

5330838017737340

5429168755154025

5429168755154023

375354034606481

379570632133224

4485521241443135

4532916206508075

4532916206508076

5590976687287124

5540641137519895

5540641137519892

30522070708059

30066552673241

30365487186802

30365487186801

Simplified Issuer Codes for Final Project:

VISA: 45 44

MasterCard: 51 53

American Express (AMEX): 37 34

Discover: 60 JCB: 31 33

Diners Club - North America: 54 55

Diners Club - Carte Blanche: 30

Diners Club - International: 36

Maestro: 58

LASER: 67

Visa Electron: 48 49

InstaPayment: 63

"Ask user at least a single question and read at least one answer."

There is a solution to this already on the site that i was happy with, however, there was no user interaction like stated in the instraction. i was wondering how you would ask the useer to actully input the file by name them selves ( using try and catch ) and then proceed with the file output.

* what i ment was, when running the code at the start there should be a user intraction to inpute the .txt file in.

like this

public void inputDataFile() throws IOException{ //Create a Scanner object for keyboard input. Scanner keyboard = new Scanner (System.in); System.out.println("Welcome"); System.out.println("Enter exactly the file name " + "'inputdata.txt'"); System.out.println("to get validated Credit Cards "); System.out.println("_______________________________________________"); //Creates the space for the user input FileDataName = keyboard.nextLine();

//File class to search the file inputdata.txt File myfile = new File (FileDataName);

//Checks if file exist //Ff file exist read the data if (myfile.exists()){ System.out.println("File Found!"); System.out.println("Identifying each Credit Card number..."); System.out.println(" "); Scanner inputFile = new Scanner (myfile); //Reading file until the end of the file while (inputFile.hasNext()){ //String argument for the following method executeCreditCard(inputFile.next()); }//end of while loop inputFile.close();//Closes the input file to end } //If file does not exit lets the user know with message else{ System.out.println("The file does not exist "); System.exit(1); } }

but leave the IOException and catch the errer by creating an object and handeling the exception, its's that part that i'm strugling on.