You may notice that entering a non-numeric value and clicking the ‘Check!’ button will cause a run-time error on the console. Therefore, your second task is to improve the application developed in Task 1 to ensure the user is only allowed to supply valid input values, i.e. a 4/5 number between 1 and 10 (inclusive). The application must still function as specified in Task 1 although you may remove the ‘Check!’ button if you wish

Sure, I can help you with that.

To ensure that the user only inputs valid values, you can use input validation in your code. Here's a sample code snippet that demonstrates how you can implement input validation in your code:

import java.util.Scanner;

public class YourClassNameHere {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int inputNumber;

        while (true) {
            System.out.print("Please enter a 4/5 number between 1 and 10 (inclusive): ");
            String input = scanner.nextLine();

            try {
                inputNumber = Integer.parseInt(input);

                if (inputNumber == 4 || inputNumber == 5) {
                    break;
                } else {
                    System.out.println("Invalid input! Please enter a valid 4/5 number between 1 and 10 (inclusive).");
                }
            } catch (NumberFormatException e) {
                System.out.println("Invalid input! Please enter a valid 4/5 number between 1 and 10 (inclusive).");
            }
        }

        // Perform calculations using valid input value inputNumber
    }
}

In this code, we are using a while loop to prompt the user to enter a valid input until they do so. We are using the `Scanner` class to get user input. We are using a `try-catch` block to catch any `NumberFormatException` that might occur when parsing the user input.

We are also checking if the inputNumber is equal to 4 or 5 and breaking out of the loop if it is. If the inputNumber is not equal to 4 or 5, we are displaying an error message and prompting the user to enter a valid input again.

Once a valid input is entered, the code will proceed with the calculations as specified in Task 1.