Employee Payroll Management System:

The project employs an MVC (Model-View-Controller) architecture for maintainability, scalability, and separation of concerns. The overall directory structure is as follows:

Employee Payroll Management System/

│

├── bin/                        # Compiled .class files (Java bytecode, same hierarchy as src/)

│

├── employees                   # JSON data file for employee records and payroll history

│

├── src/                        # Source code root

│   ├── controller/             # Controllers: Handle application logic and user input

│   │   ├── AuthenticationController.java

│   │   ├── EmployeeController.java

│   │   ├── PayrollController.java

│   │   └── TaxController.java

│   │

│   ├── model/                  # Models: Represent data and business logic

│   │   ├── Admin.java

│   │   ├── Employee.java

│   │   ├── Payroll.java

│   │   ├── PayrollProcessor.java

│   │   ├── TaxRule.java

│   │   └── User.java

│   │

│   ├── util/                   # Utilities: Helper classes and utilities

│   │   ├── DataGenerator.java

│   │   ├── EmailService.java

│   │   ├── ReportGenerator.java

│   │   ├── EmployeeFileUtil.java

│   │   └── LocalDateAdapter.java

│   │

│   └── view/                   # Views: GUI components (Java Swing)

│       ├── AdminDashboard.java

│       ├── EmployeeDashboard.java

│       ├── EmployeeManagementPanel.java

│       ├── LoginPanel.java

│       ├── ModernEmployeeDialog.java

│       ├── PayrollHistoryPanel.java

│       ├── ReportPanel.java

│       ├── TaxRulePanel.java

│       ├── WelcomeScreen.java

│       └── jesan.jpg           # Asset/Image used in the GUI

│

├── lib/                        # Third-party libraries

│   └── gson-2.10.1.jar         # Gson library for JSON serialization/deserialization

│

└── Main.java                   # Main entry point of the application

Directory Descriptions:

• bin/ Contains compiled .class files, reflecting the source structure for execution.

• employees JSON file used as the persistent data store for employee information and payroll records.

• src/ Main source code folder, structured as follows:

  • controller/: Handles user input and orchestrates communication between view and model.

  • model/: Contains core business logic and data representation.

  • util/: Helper classes, utilities for data manipulation, email simulation, report generation, file operations, and data adaptation.

  • view/: GUI panels and windows constructed with Java Swing; handles all user interface elements.

• lib/ External libraries required for the project (e.g., Gson for JSON processing).

• Main.java
  The application's main class containing the public static void main(String[] args) method to launch the system.

This modular organization ensures the project is easy to understand, maintain, and extend, adhering to best practices in OOP and Java application development.