Keypad.java

// Keypad.java
// Represents the keypad of the ATM
import java.util.Scanner; // program uses Scanner to obtain user input

public class Keypad {
    private Scanner input; // reads data from the command line
    private Screen screen;                      

    // no-argument constructor initializes the Scanner
    public Keypad() {
        input = new Scanner(System.in);
        screen = new Screen();
    } // end no-argument Keypad constructor

    // return an integer value entered by user 
    public int getInput() {
        int userInput = -1; // Default value to indicate invalid input
        boolean validInput = false; // Flag to check validity of input

        while (!validInput) {
            try {
                userInput = input.nextInt(); // Attempt to read user input
                validInput = true; // Input is valid
            } catch (Exception e) {
                screen.displayMessageLine("\n[Warning] Invalid input. Please input again:");
                input.nextLine(); // Clear the invalid input
            }
        }
        
        return userInput;  
    } // end method getInput
    
    public double getInputDouble(){
        double userInput = -1; // Default value to indicate invalid input
        boolean validInput = false; // Flag to check validity of input

        while (!validInput) {
            try {
                userInput = input.nextDouble(); // Attempt to read user input
                validInput = true; // Input is valid
            } catch (Exception e) {
                screen.displayMessageLine("\n[Warning] Invalid input. Please input again:");
                input.nextLine(); // Clear the invalid input
            }
        }
        
        return userInput;
    } // end method getInputDouble
    
}// end class Keypad

/**************************************************************************
 * (C) Copyright 1992-2007 by Deitel & Associates, Inc. and               *
 * Pearson Education, Inc. All Rights Reserved.                           *
 *                                                                        *
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 * development, research, and testing of the theories and programs        *
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 * furnishing, performance, or use of these programs.                     *
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