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I started out this chapter trying to impress on you how important it is to have documentation for your software components. There is no reuse without proper documentation. Second, I showed you how following a small set of commenting rules can turn your package and TYPE specification source into a self-documenting source, which also make losing the documentation impossible. Next, I showed you how to build and employ a text-based help tool so programmers have access to text-based documentation for any component on demand. Then I followed that up by showing you how to build and employ an HTML-based help tool so you can generate a distributable form of the documentation embedded in your package and TYPE specifications.

Finally, I gave you some pointers on distributing your software. One last suggestion is that you consider actually training your programmers on how to create new software components and use existing components. Next, I ll tell you some tall tales of success using PL/SQL, and why they were successful. So grab a cup of joe and let s go.

Note In case you wonder: Names that are local to a function, including parameters, do not clash with names outside of the function (that is, global ones). For more information about this, see the discussion of scoping, later in this chapter.

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olymorphism is the subject of this chapter. No, it s not some kind of New Age religion; it s about using the same message (or command) in order to get the same result, but for different kinds of objects. Let s look at a simple example. Figure 10-1 shows the use of the command draw() for three different geometric shapes: a square, a triangle, and a circle.

Figure 3-5. Sample directory structure for the TechConf project The project s root directory is TechConf. Under this directory you ll place the project s main buildfile, named build.xml. The subdirectories under TechConf are organized as follows: lib: Contains any libraries required at runtime by the application(s) ant: Contains Ant macrodef in a single file, macros.xml src: The root directory for all non-generated sources src/java: The root directory for all non-J2EE Java sources src/test: The root directory for all test classes src/j2ee: The root directory for all J2EE source files

square.draw()

Before you start programming in earnest, I ll try to give you an idea of what computer programming is. So, what is it It s telling a computer what to do. Computers can do lots of things, but they aren t very good at thinking for themselves. They really need to be spoonfed the details. You have to feed the computer an algorithm, in some language it understands. Algorithm is

triangle.draw()

Now that you have a suitable directory structure, your next step should be to start putting together the TechConf buildfile. The project element contains the name of your project and a nested description element.

circle.draw()

just a fancy word for a procedure or recipe a detailed description of how to do something. Consider the following: SPAM with SPAM, SPAM, Eggs, and SPAM: First, take some SPAM. Then add some SPAM, SPAM, and eggs. If a particularly spicy SPAM is desired, add some SPAM. Cook until done - Check every 10 minutes. This recipe may not be very interesting, but how it s constructed is. It consists of a series of instructions to be followed in order. Some of the instructions may be done directly ( take some SPAM ), while some require some deliberation ( If a particularly spicy SPAM is desired ), and others must be repeated several times ( Check every 10 minutes. ) Recipes and algorithms consist of ingredients (objects, things), and instructions (statements). In this example, SPAM and eggs were the ingredients, while the instructions consisted of adding SPAM, cooking for a given length of time, and so on. Let s start with some reasonably simple Python ingredients and see what you can do with them.

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