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.