MVC GUI

Hi!
I am trying to implement the MVC pattern for the client GUI but I am not sure how to.
For instance....is the Data class part of the Model or the Controller??
What methods should be included in the Model/Controller??
//Cecilia

Well that Data class, or better yet the DataAccessFacade, which has an instance of your DataAccess Interface is the Model. The controller should know about this Model, have a reference to it.
Always think of Model = data, View = GUI, and Controller is the one that handles the GUI Actions and passes it to the Model, and when the Model changes the Controller passes the changes to the View.
If you look at the JTable and understand the AbstractTableModel, and how it all works together, you will see an great example of MVC.
Here is the JTable Tutorial at Sun.
Hope that helps. If you need more clarification we are here.

Mark

According to the diagram at for J2EE Design Patterns MVC the View makes a "state query" request to the Model and gets a "change notification" back.
However you said that when the Model changes the Controller passes the changes to the View.
Who is responsible for updating the View??

Yes. Both really. Because you can have handlers like what you have to fire a "Model has Changed" or you can the controller call a method on the Data, get the data, pass it to the View, and the View changes.
There are times when you use one or the other.
Mark

hi Mark,

Always think of Model = data, View = GUI, and Controller is the one that handles the GUI Actions and passes it to the Model, and when the Model changes the Controller passes the changes to the View

i still learn on how to work with mvc for my scjd.
From my understanding about mvc is : when the model changes(by user action-->to controller), then the model itself will notify one/all of the registered observer/s to GUI, Not the controller passees the changes to the view. Pls correct me ...
Registered observer, e.g JTable

And i am having a trouble when trying to apply mvc over the network with my current understanding since server have to notified observer/s thru network and design become complicated somehow.

pls give me some advice
thks

Hi

I think that you mix a little bit the things,
Everything is happen on the client side, you don't need notified observer/s thru network.
Is something like :

Regards M

thks mihai,

you don't need notified observer/s thru network

yes in this assignment we dont have to notify observer thru the net, but
on my design(local mode), gui component such as Jtable will registered as an observer to the model.
code

interface TableObserver{
    void update(String[][] results); 
 }
 
 interface MyObservable{ 
    void addObserver(TableObserver observer);
    void notifyObserver(String[][] res );
 }
 
  
 class GUI implements TableObserver {
    private Controller con; 
    private Database data;
    
    public GUI(Controller cont,Database data){
        this.data = data; 
        this.con = cont;
        data.addObserver((TableObserver)this); // registered to model as an observer
    }
 
 
    // update method will get called by the model(Database)
    public void update(String[][] res){ .... 
          ...... // res is array of records(search results)
    }
 
class Database implements MyObservable{
    private ArrayList al;
    public Database(...){
        al = new ArrayList()
    }
    
    public void addObserver(TableObserver to){
         al.add(to)
    }
 
    public void searchResults(String[] criteria){
         // ... code(include find(), search() :wink: 
         String str[][] = // all records result will store in str 
         notifyObserver(str);
 
    }
 
    public void notifyObserver(String[][] str){
         //notify to observer  by calling update() method
         //
         update(str);
     }

sorry i can't describe my code clearly, hope you can get my idea from the code above.
the code above is what i have done so far by implementing the mvc pattern on local mode. is it right?
Pls help me,
thks