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// C degrees
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// temp in black
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UML Sequence Diagram for Thermometer Figure 5-13 is the UML Sequence Diagram corresponding to the user clicking the Up
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Button The sequence diagram shows how the Wmvc framework implements MVC to send messages to the views
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Figure 5-13 UML Sequence Diagram - Up button pressed When the user clicks the Up button, the object corresponding to the Up button, called upButton in the diagram, sends an actionPerformed message to the Up button controller, toolUp4 The toolUp controller then sends a setTemp message to the model, myModel, to increase the temperature by 1 After changing its internal state appropriately, theModel then sends the notifyViews message This is effectively a message to itself (using the Observer design pattern), which then causes the update method of each View to be called The views then change their labels appropriately
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Summary
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A "typical" GUI based application has an outer frame, a title bar, a menu bar, a tool bar, and a drawing area Applications can have dialogs with control components like buttons or lists
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Swing is Java's GUI toolkit The JFrame, JDialog, and JApplet are the normal toplevel container components used to build applications, dialogs, and applets Events are handled in Swing by defining listeners with callbacks to respond to the events MVC, Model-View-Controller is an object-oriented design pattern useful for GUI applications Wmvc is a small Swing base Java GUI framework the combines the Swing JFrame with an implementation of MVC It demonstrates all the basics for building good object-oriented Swing based GUI applications in Java
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Resources
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Swing Creating a GUI with JFC/Swing, from Sun: javasuncom/docs/books/tutorial/uiswing/indexhtml The JFC Swing Tutorial: A Guide to Constructing GUIs, Kathy Walrath, Mary Campione, Addison-Wesley, 1999, ISBN: 0-201-43321-4
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Note how this code follows the setup code for JFrames we outlined in Listing 5-1 It creates and adds JButtons to a JPanel (and implements the listeners for the buttons) The then creates a JFrame, and sets the content pane to the JPanel just created The order of creation is not important This app has no menus, so JMenuBar was not used
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The Observable class implements the Observer design pattern Design patterns are discussed in more detail in 7 The examples that follow use other design patterns, which we will note
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WmvcController is implemented using the Command design pattern See 7
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The Up button object, which we call upButton, is actually created by creating a WmvcController object The framework hides the button object from the application The corresponding controller is called toolUp
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6
6 A Case Study in Java
The goal of this chapter is to put everything from the previous chapters together to develop a small Java application We will start with a specification for the program, go through a simplified OOAD process, and finally build the program with Java and Swing For this case study, we will develop a small home video movie catalog Here is the specification for the application
The application, which we will call MovieCat, is intended to allow a collector to create a catalog of a home movie collection The movies can be collected from several sources in different media formats The movies can be either original commercial copies, or recorded at home The movies can be on VHS tape, DVD, VCD, SVCD, Hi8, or miniDV The user should be able to categorize the movies into classes such as action, comedy, family, and the like MovieCat should include the rating of the movie (G, PG-13, etc), as well as a personal evaluation by the user The information included in the catalog should include the title, director, and year the movie was made Because people often record multiple movies on one tape, MovieCat should be able to track which tape a movie is recorded on Finally, MovieCat should have a general comment field where the user can enter any other information they want to about the movie To help simplify the program, it won't have to keep track of the actors or awards, or other specific information The application should use Java and have a GUI that is simple and easy to use The user will want to browse for movies in the collection (but, at least for now, not search for specific titles or other parts), add new movies, and edit or delete existing movies
This is a simple application, so the specification can itself be simple Because MovieCat will perform a function that is familiar to everyone, maintaining a list of a movie collection, there is not a lot of specialized expertise required to build this application It might be useful to talk to a real movie buff to find out what information is most interesting to track, but most of us have seen movie reviews and books with movies listed and rated, so this is really common knowledge