Advanced Java Programming - Old Questions

13. Write short notes on.[2.5+2.5]

a. JAVA beans and JAR file

b. MVC design pattern

a. JAVA beans and JAR file

b. MVC design pattern

MVC design pattern is also known as Model-View-Controller. It is a common architectural pattern which is used to design and create interfaces and the structure of an application. This pattern divides the application into three parts that are dependent and connected to each other. 

1. Model: The Model contains only the pure application data. It doesn’t contain any information on how to show the data to the user. It is independent of the user interface. It controls the logic and rules of application.

2. View: The View presents the model’s data to the user. The view knows how to access the model’s data, but it does not know what this data means or what the user can do to manipulate it.

3. Controller: The Controller acts as an interface between View and Model. It receives the user requests and processes them, including the necessary validations. The requests are then sent to model for data processing. Once they are processed, the data is again sent back to the controller and then displayed on the view.