Question

REQUIREMENTS: Write a Graphical User Interface (GUI) program using JavaFX that prompts the user to enter a credit card number. Display whether the number is valid and the type of credit cards (i.e., Visa, MasterCard, American Express, Discover, and etc). The requirements for this assignment are listed below: • Create a class (CreditNumberValidator) that contains these methods: // Return true if the card number is valid. Boolean isValid(String cardNumber); // Get result from Step 2. int sumOfDoubleEvenPlace(String cardNumber); // Return this number if it is a single digit. Otherwise, return the sum of the two digits. // This function is used in Step 1. int getDigit(int number); // Return sum of odd-place digits in in card number (Step 3). int sumOfOddPlace(String cardNumber); // Return true if substr is the prefix for card number. bool startsWith(String cardNumber, String subStr); • The GUI must allow the user to enter the credit card number. • There is a Validate button. When clicked, the entered credit card number will be validated. • If the credit card number is a valid Visa credit card number, display the image of the Visa card. • If the credit card number is a valid American Express credit card number, display the image of the American Express card. • If the credit card number is a valid Master credit card number, display the image of the Master card. • If the credit card number is a valid Discover credit card number, display the image of the Discover card. • If the credit card is invalid, display the Invalid Number image. • Do not allow non-digits from being entered.

Answer 1

JavaFx file

import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.image.Image;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javafx.scene.image.ImageView;
import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.GridPane;
import javafx.scene.text.Text;
import javafx.scene.control.TextField;
import javafx.stage.Stage;

public class CreditCardValidation extends Application {
  
String imagePath="C:UsersJayDesktopvalidator.png";
@Override
  
public void start(Stage stage) throws FileNotFoundException {
  
  
  
//creating label Credit card number
  
Text text1 = new Text("Credit Card Number: ");   

//Creating Text Filed Credit card number
TextField textField1 = new TextField();   
//Creating Buttons
Button button1 = new Button("Validate");
//Creating a Grid Pane
GridPane gridPane = new GridPane();
//Setting size for the pane
gridPane.setMinSize(800, 300);
//Setting the padding
gridPane.setPadding(new Insets(10, 10, 10, 10));   
//Setting the vertical and horizontal gaps between the columns
gridPane.setVgap(5);
gridPane.setHgap(5);   
//Setting the Grid alignment
gridPane.setAlignment(Pos.TOP_CENTER);
//Arranging all the nodes in the grid
button1.setOnAction(new EventHandler<ActionEvent>() {
@Override
public void handle(ActionEvent event) {
String cardNumber=textField1.getText();
CreditNumberValidator c1=new CreditNumberValidator();
if(c1.isValid(cardNumber))
{
if(cardNumber.charAt(0)=='4')
imagePath="C:UsersJayDesktopvisa.jpg";
else if(cardNumber.charAt(0)=='5')
imagePath="C:UsersJayDesktopmaster.jpg";
else if(cardNumber.charAt(0)=='6')
imagePath="C:UsersJayDesktopdiscover.jpg";
else
imagePath="C:UsersJayDesktopamericanExpress.jpg";
}
else
{
imagePath="C:UsersJayDesktopinvalid.jpg";
}
try {
Image image;
  
image = new Image(new FileInputStream(imagePath)) {};
ImageView imageView1 = new ImageView(image);
imageView1.setFitHeight(100);
imageView1.setFitWidth(500);
imageView1.setPreserveRatio(true);
gridPane.add(imageView1,0,3);
} catch (FileNotFoundException ex) {
Logger.getLogger(CreditCardValidation.class.getName()).log(Level.SEVERE, null, ex);
}   
}
});
  
gridPane.add(text1, 0, 0);
gridPane.add(textField1, 1, 0);
gridPane.add(button1, 1, 2);

//Creating a scene object
Scene scene = new Scene(gridPane);
//Setting title to the Stage
stage.setTitle("Credit Card Validator");
//Adding scene to the stage
stage.setScene(scene);
//Displaying the contents of the stage
stage.show();
}

/**
* @param args the command line arguments
*/
public static void main(String[] args) {
launch(args);
}
  
}

CreditNumberValidator,java
public class CreditNumberValidator {
  
public boolean isValid(String cardNumber)
{
long number=Long.parseLong(cardNumber);
return (getSize(number) >= 13 &&
getSize(number) <= 16) &&
(prefixMatched(number, 4) ||
prefixMatched(number, 5) ||
prefixMatched(number, 37) ||
prefixMatched(number, 6)) &&
((sumOfDoubleEvenPlace(number) +
sumOfOddPlace(number)) % 10 == 0);
}
// Get the result from Step 2
public static int sumOfDoubleEvenPlace(long number)
{
int sum = 0;
String num = number + "";
for (int i = getSize(number) - 2; i >= 0; i -= 2)
sum += getDigit(Integer.parseInt(num.charAt(i) + "") * 2);
  
return sum;
}
  
// Return this number if it is a single digit, otherwise,
// return the sum of the two digits
public static int getDigit(int number)
{
if (number < 9)
return number;
return number / 10 + number % 10;
}
  
// Return sum of odd-place digits in number
public static int sumOfOddPlace(long number)
{
int sum = 0;
String num = number + "";
for (int i = getSize(number) - 1; i >= 0; i -= 2)
sum += Integer.parseInt(num.charAt(i) + "");   
return sum;
}
  
// Return true if the digit d is a prefix for number
public static boolean prefixMatched(long number, int d)
{
return getPrefix(number, getSize(d)) == d;
}
  
// Return the number of digits in d
public static int getSize(long d)
{
String num = d + "";
return num.length();
}
  
// Return the first k number of digits from
// number. If the number of digits in number
// is less than k, return number.
public static long getPrefix(long number, int k)
{
if (getSize(number) > k) {
String num = number + "";
return Long.parseLong(num.substring(0, k));
}
return number;
}
}

output

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