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It is this JxFrame class that we use in virtually all of our examples in this book, to avoid continually retyping the same code. 56 A Simple Two Button Program Now with these fundamentals taken care of, we can write a simple program with two buttons in a frame. One button switches the color of the background and the other causes the program to exit. exit(0); } The only remaining part is the code that switches the background colors. setBackground(color); repaint(); } { That’s all there is to writing a basic JFC application.

37 THE BUILDER PATTERN We have already seen that the Factory Pattern returns one of several different subclasses depending on the data passed to in arguments to the creation methods. But suppose we don’t want just a computing algorithm, but a whole different user interface depending on the data we need to display. A typical example might be your E-mail address book. You probably have both people and groups of people in your address book, and you would expect the display for the address book to change so that the People screen has places for first and last name, company, E-mail address and phone number.

Then you can use these to set the features the way you want them. setMargin(new Insets(0,0,0,0)); This gives us the screen look we want: Design Patterns in the Action Object One reason to spend a little time discussing objects that implement the Action interface is that they exemplify at least two design patterns. First, each Action object must have its own actionListener method, and thus can directly launch the code to respond that that action. In addition, even though these Action objects may have two (or more) visual instantiations, they provide a single point that launches this code.

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