ZenithHR: Employee Management System

A professional Java-based payroll and employee management system demonstrating advanced Object-Oriented Programming (OOP) principles, GUI integration, and secure database management.

Project Overview

ZenithHR provides a unified platform to manage employee lifecycles, payroll calculations, and persistent data storage.

• Payroll Engine: Robust business logic using polymorphism for varied employee types.
• Modern GUI: A sleek Swing-based desktop interface for real-time employee management.
• Secure Persistence: Centralized JDBC integration with MySQL using PreparedStatements to prevent SQL injection.

Architecture Diagram

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Core Components (OOPS Package)

• Employee: The central data model supporting both GUI and backend logic.
• FulltimeEmployee: Specialization for salaried staff.
• PartTimeEmployee: Dynamic salary calculation based on hours and rates.
• EmployeeDAO: Data Access Object for high-level database operations.
• DBhelper: Centralized connection utility for consistent database access.

Getting Started

Prerequisites

• Java JDK 8+
• MySQL Server
• MySQL JDBC Driver (mysql-connector-java)

Setup Instructions

1. Create Database

   CREATE DATABASE payroll_system;
   USE payroll_system;
   
   CREATE TABLE employees (
       id INT AUTO_INCREMENT PRIMARY KEY,
       name VARCHAR(100),
       age INT,
       salary DOUBLE,
       department VARCHAR(50)
   );

2. Update Database Configuration Edit OOPS/DBhelper.java:

   private static final String URL = "jdbc:mysql://localhost:3306/payroll_system";
   private static final String USER = "root";
   private static final String PASS = "your_password";

3. Compile Project

   javac OOPS/*.java

4. Run Application

   • Launch GUI: java OOPS.EmployeeGUI
   • Run CLI Demo: java OOPS.Main

OOP Concepts Demonstrated

Concept	Implementation
Inheritance	FulltimeEmployee & PartTimeEmployee extend Employee
Polymorphism	Overridden constructors and dynamic salary assignments
Encapsulation	Private attributes with public accessors in Employee
Data Abstraction	Decoupled Data Access Object (EmployeeDAO) from UI logic

💾 Database Schema

employees table

Field	Type	Description
id	INT	Primary Key (Auto-increment)
name	VARCHAR	Employee Full Name
age	INT	Employee Age
salary	DOUBLE	Calculated Monthly/Hourly Salary

🔧 Usage Examples

Running the ZenithHR GUI

1. Launch EmployeeGUI.
2. Enter the employee's Name, Age, and Salary.
3. Click Add Employee to persist to the database.
4. Use Refresh List to sync with the latest database records.

Future Roadmap

• User Authentication & Role-based Access
• Advanced Reporting (Export to PDF/Excel)
• Employee Performance Tracking
• Automated Salary Slip Generation

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Developed with ZenithHR: Precision in People Management.