Model–View–Controller (MVC) Design Patterns

It is defined as follows

• Models: Models are object used as blueprints for all of the objects that will be used in the application. 
• Views: views are used to represent the presentational aspect of the information and data located in the models. 
• Controller: controller are act as both of the models as well as views. They serve as a connection between the models and views.

public class Collage { private String rollNo; private String name; public String getRollNo() { return rollNo; } public void setRollNo(String rollNo) { this.rollNo = rollNo; } public String getName() { return name; } public void setName(String name) { this.name = name; } }
Step 2. Create View.
CollageView.java
public class CollageView { public void printCollageDetails(String CollageName, String CollageRollNo){ System.out.println("Collage: "); System.out.println("Name: " + CollageName); System.out.println("Roll No: " + CollageRollNo); } }
Step 3. Create Controller.
CollageController.java
public class CollageController { private Collage model; private CollageView view; public CollageController(Collage model, CollageView view){ this.model = model; this.view = view; } public void setCollageName(String name){ model.setName(name); } public String getCollageName(){ return model.getName(); } public void setCollageRollNo(String rollNo){ model.setRollNo(rollNo); } public String getCollageRollNo(){ return model.getRollNo(); } public void updateView(){ view.printCollageDetails(model.getName(), model.getRollNo()); } }
Step 4. Use the CollageController methods to demonstrate MVC design pattern usage.
MVCPatternDemo.java
public static void main(String[] args) { //fetch Collage record based on his roll no from the database Collage model = retriveCollageFromDatabase(); //Create a view : to write Collage details on console CollageView view = new CollageView(); CollageController controller = new CollageController(model, view); controller.updateView(); //update model data controller.setCollageName("Manoj"); controller.updateView(); } private static Collage retriveCollageFromDatabase(){ Collage Collage = new Collage(); Collage.setName("ABCD"); Collage.setRollNo("20"); return Collage; } }