This Project Involves Writing A Program That Implements An A

This Project Involves Writing A Program That Implements An Atm Machine

This project involves creating a Java program that simulates an ATM machine using a graphical user interface (GUI). The application will consist of three classes: the main class that defines the GUI and handles user interactions, an Account class representing bank accounts, and a custom checked exception class called InsufficientFunds. The GUI should provide four buttons—Withdraw, Deposit, Transfer, and Balance—and allow users to select between Checking and Savings accounts via radio buttons. Each button triggers specific methods that perform appropriate operations with necessary validation and error handling.

Paper For Above instruction

The development of an ATM simulation program in Java involves a comprehensive understanding of graphical user interface design, object-oriented programming principles, exception handling, and adherence to coding standards. This paper discusses how to design and implement a Java application that accurately models ATM functionalities, including account management, transaction processing, user interaction, and error handling, following industry best practices and style guidelines.

The core of this project is a Java GUI that mimics an ATM machine. The GUI should feature four primary buttons: Withdraw, Deposit, Transfer, and Balance. Additionally, two radio buttons will enable the user to select between Checking and Savings accounts. The interface's visual elements must be clear, intuitive, and consistent with conventional ATM designs to facilitate user interaction. The main class containing this GUI will instantiate two Account objects—one for checking and one for savings—and will handle user actions via event listeners tied to each button.

The Main Class serves as the controller, orchestrating interactions between the GUI and the backend logic encapsulated within the Account class. Each button press invokes corresponding methods in the Account class, which perform the actual account operations. For example, clicking the Withdraw button triggers a method that ensures the input is numeric, in increments of $20, and verifies sufficient funds. If all validations pass, the withdrawal proceeds; otherwise, an error message is displayed using JOptionPane.

The Account Class models individual bank accounts, including checking and savings accounts. It provides methods for deposit, withdrawal, transfer, and balance inquiry, each implementing necessary validation logic. Notably, the class includes logic to apply a service charge of $1.50 after more than four total withdrawals from either account. This involves maintaining a counter for the total number of withdrawals across both accounts. When a withdrawal exceeds this threshold, the account checks whether sufficient funds are available to cover the withdrawal and the service charge before proceeding.

An important feature of the Account class is robust exception handling. If a withdrawal exceeds the account's balance, a user-defined Checked Exception, InsufficientFunds, is thrown. This exception must be properly defined, including relevant constructors, and used in the withdrawal method whenever an overdraw occurs. The exception handling mechanism ensures that users are appropriately notified of insufficient funds, and the application remains stable.

The InsufficientFunds class is a custom checked exception. It extends the Exception class and includes constructors for creating exception instances with descriptive messages. This class encapsulates the specific error condition of attempting to withdraw more funds than available, allowing the main program to handle such exceptions gracefully.

Adhering to the Google Java Style Guide, the implementation must include well-documented code with meaningful variable names, header comments describing filename, author, date, and purpose, as well as inline comments explaining major functionalities. Class names should follow UpperCamelCase convention, while variable names are in lowerCamelCase. Constants are to be defined in all uppercase with underscores separating words. Braces will follow the K&R style, with opening braces on the same line as the statement.

All instance variables should be declared private to enforce encapsulation. Duplicated code should be minimized through modular methods, and logic should be thoroughly tested with a comprehensive suite of test cases. These test cases must be presented in a table outlining input values, expected outputs, actual outputs, and pass/fail status. Test case diversity should cover boundary conditions, invalid inputs, typical transactions, and error scenarios to ensure reliability and robustness.

In conclusion, implementing this ATM simulation requires careful design to integrate GUI components, account management, exception handling, and style conformity. Proper documentation, code modularity, and rigorous testing are essential to develop a reliable and user-friendly application that accurately models banking transactions and adheres to professional coding standards.

References

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