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Read e-book online An introduction to categories in computing PDF

By Jay C.B.

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Back to our program, the first line of the code is actually just a comment that tells us about the program: // TickerTape Applet Although Java allows us to use any or all of these styles within a single program, we will only use the // notation in our TickerTape program. After all, we don’t want to make things more complicated than they need to be. What’s in a Package? The next two lines of our applet are used to reference packages that contain classes that contain the methods we wish to use.

Java. 2. Compile the program. class. To compile the program, you’ll need access to the Java Developer’s Kit. 3. Move the file into the same directory where you store your HTML files. 4. "> Recall that HTML is the language used to create Web pages. Each statement in the language specifies one specific formatting, file processing or hypertext (linking) operation, such as loading and displaying a graphic image, defining a hypertext link, displaying a word or sentence in bold, or loading and playing a Java applet.

Of course, you can add all the comments you want to aid in understanding your code, but your code may run on for pages and pages. It is not always easy to look at a Java class and understand how it can be used. So, why doesn’t Java use header files? There are two reasons. First, it is not possible to use a library that declares a method but does not implement it. Second, it is more difficult to program using files that are out of synchronization with the implementation. Gone: Multiple Inheritance Very often in object-oriented programming, an object needs to inherit the functionality of more than one class.

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