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Once you re done reading the file, you need to update the screen with some piece of data, like the number of characters in the file or the file contents Why the separation Basically, because you do this combined set of tasks frequently (And if you don t, you should) Remember that Swing components are not threadsafe, and should only be accessed from the event dispatch thread Without using the SwingWorker class, the normal mode of operation is to kick off a new thread that performs a lengthy task, and then when done, notify the event thread to update the screen of your changes Sometimes you forget about the first piece of this, causing the event thread to block during the lengthy task If you use SwingWorker, though, you can save yourself some trouble There are multiple ways to use the SwingWorker class.

In 1, we took a high-level look at the compilation process. You saw that the compiler takes the source code file and produces an output file called an assembly. This chapter will take a closer look at assemblies and how they are produced and deployed. You will also look at how namespaces help organize types. All the programs you ve seen so far have, for the most part, declared and used their own classes. In many projects, however, you will want to use classes or types from other assemblies. These other assemblies might come from the BCL or a third-party vendor, or you might have created them yourself. These are called class libraries, and the names of their assembly files generally end with the .dll extension rather than the .exe extension. For example, suppose that you want to create a class library that contains classes and types that can be used by other assemblies. The source code for a simple library is shown in the following example and is contained in a file called SuperLib.cs. The library contains a single public class called SquareWidget. Figure 10-1 illustrates the production of the DLL. public class SquareWidget { public double SideLength = 0; public double Area { get { return SideLength * SideLength; } } }

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In function-oriented designing, it is fairly common practical advice that, while inheritance (and, especially, polymorphism) is a very interesting feature of function orientation, composition should be used much more frequently. This is because specializing multiple classes adds up to multiple children; further specialization adds multiple children of the previous ones. This makes a class network unnecessarily complex; multiplication is much better managed by combining one new class with the old ones. Simply put, inheritance should be used only when a function must have changes inserted or when an object must be implicitly replaced. But it is extremely uncommon to hear that there is very strong philosophy behind that advice. Inheritance is another way of saying static adaptation; likewise, polymorphism is another way of saying dynamic adaptation. These are not to be confused with adaptability, which is the greatest benefit of function orientation. At each step, then, the comparison is composition versus adaptation. Basically, in constructing an application, each instance of adaptation depletes adaptability.

Suppose also that you are writing a program called MyWidgets, and you want to use the SquareWidget class. The code for the program is in a file called MyWidgets.cs and is shown in the following example. The code simply creates an object of type SquareWidget and uses the object s members. using System; class WidgetsProgram { static void Main( ) { SquareWidget sq = new SquareWidget(); Not declared in this assembly sq.SideLength = 5.0; Console.WriteLine(sq.Area); } } Not declared in this assembly

The basic operation, which follows the pattern previously mentioned, is the method pair doInBackground() and done() You subclass SwingWorker, override the doInBackground() method with some lengthy.

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