CIS355A Week 5 Lab File Processing Objectives Add Per 208316

Cis355a Week 5 Labfile Processingobjectives Add Persistent Data Stor

The assignment requires enhancing a stock portfolio management system with persistent data storage capabilities using text files. You will modify an existing GUI application to include file menu options such as open, save, and exit, and manage stock data through file I/O operations. Additionally, your system should display the total portfolio value dynamically as stocks are added or removed.

Specifically, you need to develop a StockIO class responsible for reading stock data from a text file and writing data back to it, using an ArrayList of Stock objects. The data format should be delimiter-separated, with each line representing a stock entry, for example: Apple#100#55.0#80.0. The Stock class's toString method must be modified to display stock information in a specific format like "Apple: 10 shares."

Your GUI should include a menu with open, save, and exit options. Open should prompt the user for a filename, read the data from the file, and populate the JList and the internal ArrayList. Save should prompt for a filename and save current stocks to the specified file. Exit should close the program. The total portfolio value should be displayed in a label and updated in real-time whenever stocks are added or removed.

Ensure that any stock addition or removal updates both the visual list and the internal ArrayList to keep data consistent. Throughout your code, include meaningful comments, use descriptive variable names, and maintain proper indentation to ensure readability and adherence to coding standards.

Paper For Above instruction

Implementation of Persistent Data Storage in a Stock Portfolio Management System

The management of financial data, particularly stock portfolios, requires not only accurate real-time computations but also reliable data persistence mechanisms to ensure information continuity across user sessions. In this context, enhancing a GUI-based stock portfolio management system with file input/output capabilities offers users the convenience of saving their data and restoring it later, thus facilitating a seamless user experience. This paper discusses the implementation process of adding persistent data storage to an existing Java GUI application, aligning with specific functional and technical requirements.

Introduction

The core objective of this project is to extend a previously developed stock portfolio management system to include persistent data storage through text files. The system already provides functionalities for adding and removing stocks, displaying them in a graphical list, and computing the total portfolio value. The enhancement involves implementing file operations—opening existing data files, saving current data, and exiting the application—with an intuitive GUI interface, thus making data management more robust and user-friendly.

Design and Implementation

Class Modifications and Additions

The implementation primarily involves three classes: Stock, StockIO, and the GUI class managing user interactions.

1. Stock Class:

   The Stock class models individual stock holdings, encapsulating properties such as company name, quantity of shares, purchase price, and current market price. The toString method is modified to return a string formatted as “Company: qty shares”, for example, “Apple: 10 shares”. This format ensures clarity when stocks are listed in the GUI, simplifying user understanding.

2. StockIO Class:

   This class handles data persistence by reading from and writing to text files. It maintains a filename property, set via a constructor or setter method, which defines the data source. The getData method reads the text file line-by-line, parses each line based on a delimiter (e.g., '#'), creates Stock objects, and adds them to an ArrayList. Conversely, saveData writes the stocks in the ArrayList back into the file, adhering to the proper delimiter-separated format. Proper exception handling ensures robustness during file operations.

3. GUI Class:

   The GUI includes a menu bar with options: open, save, and exit. The open operation prompts the user with JOptionPane for a filename, then calls getData from StockIO to populate the internal ArrayList and the visual JList. The save operation prompts for a filename and writes current stocks to the file. Exiting terminates the application gracefully.

A critical aspect involves synchronizing the internal ArrayList and the JList's ListModel. When stocks are added or removed, both data structures are immediately updated, ensuring consistency. The total portfolio value is calculated dynamically by summing the product of the number of shares and current price for each stock. This value is continually refreshed whenever modifications occur, and is displayed via a label in the GUI.

User Interface Enhancements

The GUI layout is augmented to include a JMenu with “File” containing “Open,” “Save,” and “Exit” options. A JLabel displays the current total value of the portfolio. Interaction with menu items triggers file dialogs (JOptionPane) for filenames, and appropriate actions for reading and writing data. These features enable users to manage their stock data persistently, reducing manual entry and risk of data loss.

Code Style and Comments

Throughout the implementation, code readability and maintainability are prioritized. Meaningful variable and method names are used to improve clarity, and comprehensive comments describe the purpose and functionality of code segments, including class-level headers and method descriptions. Proper indentation and formatting conform to Java best practices, facilitating collaboration and future modifications.

Conclusion

Incorporating persistent data storage in a stock portfolio application enhances its practicality and usability. Using text files with a well-defined data format ensures easy data management and interoperability. The strategic use of classes such as Stock and StockIO, along with GUI enhancements, achieves a robust system where user data is preserved across sessions, facilitating effective portfolio management. This implementation exemplifies the integration of core Java programming concepts—file I/O, collection management, GUI development, and exception handling—to deliver a comprehensive financial application.

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