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Most MVC examples show code doing something interesting. Here, to make the MVC functionality clear, Amature model java game model does almost nothing it has a counter and the model, view Amature model java game controller are separate classes. Bergin's model has been simplified Model class and Bergin's GUI class, which contains both the controller and the view, has been separated into two classes Controller class, View classresulting one class for Amature model java game of the model, view and controller.

The model has state a counter. The model accepts a command to change state increment the counter. The model emits notices of change of state, and the new state. The model has no code specifying where the notices are sent or from where it will accept the command. This makes the model reusable. A non-reusable piece of code RunMVC tells model to send notices to view and to accept commands from controller.

In this code Amature model java game : notifyObservers counter pushes the model's status to the View. In Bergin's code, the generic Model : notifyObservers i. The code for pull in the Model is commented out.

If pull is used, the View needs a reference to the Model code is also commented out in Viewmaking the View less reusable. By extending ObservableModel has the method Observable : addObservers to send change of status messages to the view.

With the code for the Model not having a reference to the View at least as an attributehow does the Model know where view is?

A non-reusable glue class Sexy mature dressed/ undressed term Images of naked sexy lesbian instantiates the objects model, view and controller and tells them what they need to know about each other. RunMVC : myModel. Although there is no mention of view in the model code thus making Model reusablethe model is being passed a reference to the view.

This can be done because Model is an Observable and an Observable knows the declaration of an Observer like view. View shows the model's state, and allows the user to enter commands which will change the model's state. As is required for reusability, the View doesn't know about i. Mary louise parker naked in new york you use the view to initialise the model, and we didn't, then the view needs a refence to the model.

The View doesn't hold a reference to the controller either. However the View sends button actions to the controller, so the button must be given a reference to the controller. For View to accept the controller reference parameter to addControllerView must have the declaration of Controller. The consequence of this requirement is that View is dependant on Controller and hence not reusable.

We didn't have the same reusability problem with Model, because Java had declared a base class Observer. The problem of View not being reusable comes about because Java doesn't have a base class Controller. Why isn't there a base class Controller? According to google, no-one has even thought about it. I mused about the central role of the 30yr old MVC to OOP design patterns, and wondered why someone hadn't written a controller base class.

The base class had to be extendable by classes that Amature model java game presumably to UIs. Then I realised that Controller is an ActionListner.

This gets us part of the way. Now View is reusable by controllers which are ActionListeners, but not controllers which are other types of Listeners. Presumably View can be extended for all listeners. Perhaps no-one needs a base class for Controller.

Extending the idea of referring to controller by its superclass, going up one more level to java. EventListener gives an error.

The interesting functionality of View communicates with the controller and the model. How does myView. It all happens inside the instance Observable : myModel.

Here is the code which instantiates the classes and passes references to the classes which Amature model java game them. It then runs the initialisation code. This code is specific to Amature model java game model, controller and view.

It is not meant to be reusable. I could have had a main in RunMVC. However when writing test code, I find it Amature model java game for the executable and jar files all to have the same name. Here's Main.

A simple example of MVC. There is one class for each of Model, View and Controller. Model is reusable. View is reusable as long as Controller is an ActionListener. Controller is not reusable. Joseph Mack jmack at austintek dot com. Table of Contents 1. Introduction 2. The Model 3. The View pt1 4. The View pt2 5. The Controller 6. Glue code 7. Figure 1.

The Model. Note The Model doesn't know about i. All it knows is its status. This is required for the Model to be reusable. The View pt1. Warning This code works fine, but is not reusable. It's what you might write for a first iteration. If you just want the reusable code and aren't interested in the explanation, hop to The View pt2. The View pt2. After first changing the model's state, Observable : setChanged changes the flag Observable : changed to true.

Object Integer counter. Subsequent commands in update present the model's new status to the user. The Controller. When the method receives a button press, it changes the state of Model by running myModel. Glue code. In some circles, this is called calibrating the readout instrument.

In this MVC example, you would need two separate pieces of initialisation code, in the model and in the view. If you changed the initialisation value in one you'd have to remember or know to change the initialisation value in the other.

A recipe for disaster. Alternately, when instantiating model, you could run setValue Amature model java game ; as part of the constructor, sending a message to the view. This requires the view to be instantiated before the model, otherwise the message will be send to null the unitialised value for view.

This isn't a particularly onerous requirement, and is possibly a reasonable approach. Amature model java game, have RunMVC tell the view to intialise Amature model java game model. The requires the view to have a reference to the model. This seemed an unneccesary complication. I decided instead in RunMVC, to instantiate model, view and controller, make all the connections, then since the Controller already has a reference to the model which it uses to alter the status of the modelto initialise the model from the controller and have the model automatically update the view.

The Model doesn't know about i. This code works fine, but is not reusable. Button; import java. Panel; Large hips and hairy pussy java.

Frame; import java. TextField; import java. Label; import java. ActionListener in java. Button cannot be applied to java. Date e.


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