Notes – MVC Architecture in Advanced Java
MVC stands for Model-View-Controller. It’s a widely used design pattern in Java for building web applications. It helps separate the logic of an application into three interconnected parts.
Why Use MVC?
- Makes code organized and manageable
- Separates business logic from user interface
- Makes applications easier to maintain, test, and scale
Components of MVC
| Component | Role |
|---|---|
| Model | Represents the data and business logic. It accesses and updates data. |
| View | Represents the UI (User Interface). Displays data to the user. |
| Controller | Acts as the bridge between View and Model. It handles user input and updates Model and View accordingly. |
How MVC Works – Simple Flow
- User interacts with the View (like clicking a button).
- The Controller processes that input.
- It calls the Model to update or fetch data.
- The Model returns data.
- The Controller updates the View with the new data.
MVC in Advanced Java Web Apps
- Servlets → Controller
- JSP (JavaServer Pages) → View
- JavaBeans or POJOs → Model
Real-World Analogy
Think of an online shopping site:
- Model: Product info, pricing, order details (data layer)
- View: HTML/JSP pages shown to the user
- Controller: Handles actions like “Add to Cart”, “Place Order”
Advantages of MVC
- Clean code separation
- Better team collaboration (UI devs work on View, backend devs on Model)
- Reusability of components
- Easy to test and debug
