Automated Teller Machine (ATM) Program in Java
What is the required functionality of the Java program that needs to be implemented?
Please provide a detailed explanation.
The provided task requires implementing a simple ATM (Automated Teller Machine) program in Java. The program should allow users to withdraw money from their account.
The program should include:
1. Account class: Represents the user's account and manages the balance.
2. ATM_Exception class: Extends the Exception class and defines two types of exceptions - BALANCE_NOT_ENOUGH and AMOUNT_INVALID.
3. Simple_ATM_Service class: Implements the ATM_Service interface and provides functionality for checking balance, validating withdrawal amount, and performing the withdrawal.
In the Simple_ATM_Service class:
- The checkBalance method verifies if the account balance is sufficient and throws the BALANCE_NOT_ENOUGH exception if not.
- The isValidAmount method checks if the withdrawal amount is divisible by 1000 and throws the AMOUNT_INVALID exception if not.
- The withdraw method first calls checkBalance and isValidAmount, catches exceptions, updates the account balance if the withdrawal is valid, and displays the updated balance.
By executing the sample input provided, the program demonstrates the ATM functionality by creating an account, performing withdrawals, and displaying the output.
Overall, the Java program functions as a simple ATM system, ensuring valid withdrawals and exception handling.
Creating a Java program for a simple ATM system involves defining classes and implementing specific functionalities to enable users to withdraw money from their account seamlessly. The Account class serves as a representation of the user's account and manages the balance associated with it. This class includes methods to set and get the balance value, ensuring accurate tracking of the account balance.
The ATM_Exception class extends the Exception class and introduces two custom exceptions - BALANCE_NOT_ENOUGH and AMOUNT_INVALID. These exceptions are raised in scenarios where the account balance is insufficient for withdrawal or when the withdrawal amount is not a multiple of 1000, respectively. By defining these exceptions, the program can handle such exceptional cases effectively.
The Simple_ATM_Service class implements the ATM_Service interface, which outlines the base functions for ATM operations. This class includes methods to check the balance, validate the withdrawal amount, and perform the withdrawal operation. The checkBalance method verifies the sufficiency of the account balance, while the isValidAmount method ensures that the withdrawal amount meets the required criteria.
Within the withdraw method of the Simple_ATM_Service class, the program calls checkBalance and isValidAmount to validate the withdrawal operation. If the operation is valid, the method debits the specified amount from the user's account and updates the balance accordingly. Additionally, the program catches any exceptions raised during the process and displays the exception information using the getMessage method of ATM_Exception.
By running the sample input provided, the program demonstrates the functionality of the simple ATM system. It creates an account with an initial balance of 4000 and performs multiple withdrawal transactions using the Simple_ATM_Service class. The output showcases the results of each withdrawal operation and the updated balance after each transaction, illustrating the program's effective functionality.
Overall, the Java program for the simple ATM system showcases the implementation of essential ATM operations, ensuring secure and valid withdrawals while handling exceptions professionally. By following the provided structure and executing the sample input, users can experience a simplified version of an Automated Teller Machine in action.