MVC Adding 2 Numbers Program

MVC Architecture simple JAVA Program(MVC Adding 2 Numbers Program )

M-Model

V-View

C-Controller

Introduction: 

         MVC architecture is uses in Programming languages when that program contains "user Interface components "(like buttons ,text fields, combo box).

         

Tutorial :

        I am taking a simple example "adding two number" to demonstrate MVC Architecture.i'm going to divide the program into 4 parts  

1. MODEL class ---MVC_Model
2. VIEW class --- MVC_View
3. CONTROLLER class ---MVC_Controller
4. Intialize all above three classes in Main Method class ---GlobelMVC

View class : View is only contains the user interface part (JButton, JTextField..etc) and it wouldn't  having the controllers means setting a listener for a button ( button.addActionListener(this) ). the use of the separate class for User Interface is we can modify the User Interface in Future with out changing the other functionality  
/*

*program: Adding Two Numbers Using MVC 
 *author: padmanLabs.blogspot.in
 *date: 18-Aug-2012
 */

import java.awt.Container;
import java.awt.FlowLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;

public class MVC_View extends JFrame
{
 Container con;
 JButton addButton;
 JTextField textField1,textField2,textFieldresult;
 JLabel first,second,result;
 
 public MVC_View(MVC_Model model)
 {
  con=getContentPane();
  setTitle("MVC ADD");
  setLayout(new FlowLayout());
  setSize(220,200);
  first=new JLabel("first variable");
  textField1=new JTextField("",10);
  second=new JLabel("second variable");
  textField2=new JTextField("",8);
  result=new JLabel("result");
  textFieldresult=new JTextField("",13);
  addButton=new JButton("add");
  con.add(first);
  con.add(textField1);
  con.add(second);
  con.add(textField2);
  con.add(result);
  con.add(textFieldresult);
  con.add(addButton);
  setVisible(true);
 }
}

CONTROLLER class:

/*
 *program: Adding Two Numbers Using MVC 
 *author: padmanLabs.blogspot.in
 *date: 18-Aug-2012
 */
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.PrintStream;

public class MVC_Controller implements ActionListener
{
 MVC_Model model;
 MVC_View view;
 public MVC_Controller(MVC_View v,MVC_Model m)
 {
  model=m;
  view=v;
  actionListenerMeth(this);//add action listener to the Button
 } 
 
 @Override
 public void actionPerformed(ActionEvent arg0) {
  try
  {
   //retrieve the input from View
   String a=view.textField1.getText();
   String b=view.textField2.getText();
   
   //call add method
   int result=model.add(a,b);
   
   //display result in View(UI)
   view.textFieldresult.setText(""+result);
  }
  catch(Exception ee)
  {
   ee.printStackTrace();
  }  
 }
 
 public void actionListenerMeth(ActionListener ae)
 {
  view.addButton.addActionListener(ae);
 }
 

}

Model class :

/*
 *program: Adding Two Numbers Using MVC 
 *author: padmanLabs.blogspot.in
 *date: 18-Aug-2012
 */

public class MVC_Model
{
 //implement the logic of the program
 public int add(String x,String y)
 {
  int a=Integer.parseInt(x);
  int b=Integer.parseInt(y);
  int result=a+b;
  return (result);
 }
 
}

MainMethod:

/*
 *program: Adding Two Numbers Using MVC 
 *author: padmanLabs.blogspot.in
 *date: 18-Aug-2012
 */
class GlobalMVC
{
 public static void main(String args[])
 {
  MVC_Model m=new MVC_Model();
  MVC_View v= new MVC_View(m); 
  new MVC_Controller(v,m);
  
 }
}

Compile:

execute main Methos class -- GlobalMVC.java

output: