visual basic barcode printing 12: Clarity and Maintainability in Java

Encode PDF417 in Java 12: Clarity and Maintainability

12: Clarity and Maintainability
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Avoid Deeply Nested and Complex Logic
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Less is more when it comes to branching. In fact, your assessor may be applying the Cyclomatic Complexity measure to your code, which considers code to be complex not based on lines of code, but rather on how many branch points there are. (It s actually much more complex than that. Ironically, the test for code complexity is itself a rather complex formula.) The bottom line is, whenever you see a nested if or anything other than very simple logic flow in a method, you should seriously consider redesigning that method or splitting functionality into separate methods.
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Use Getters and Setters That Follow the JavaBean Naming Convention
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That means you should use set<yourPropertyName> for methods that can modify a property (normally a property maps directly to an instance variable, but not necessarily) and get<yourPropertyName> for methods that can read a property. For example, a String variable name would have the following getter/setter methods:
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setName(String name) String getName()
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If the property is a boolean, then you have a choice (yes, you actually have a choice) of whether to call the read method get<property> or is<property>. For example, a boolean instance variable motorOn can have the following getter/setter methods:
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setMotorOn(boolean state) boolean getMotorOn() boolean isMotorOn()
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The beauty of adhering to the JavaBeans naming convention is that, hey, you have to name it something and if you stick with the convention, then most Java-related tools (and some technologies) can read your code and automatically detect that you have editable properties, for example. It s cool; you should do it.
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Don t Be a Procedural Programmer in an OO World
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The two dead giveaways that you haven t really made the transition to a complete object being, are when you use the following:
Really Big Classes that have methods for everything.
Write Clear and Maintainable Code
Lots of static methods. In fact, all methods should be nonstatic unless you
have a truly good reason to make them static. This is OO. We don t have global variables and functions. There s no start here and then keep executing linearly except when you branch, of course . This is OO, and that means objects all the way down.
Make Variables and Methods As Self-Explanatory As Possible
Don t use variable names like x and y. What the heck does this mean: int x = 27; 27 what Unless you really think you can lock up job security by making sure nobody can understand your code (and assuming the homicidal maniac who tries won t find you), then you should make your identifiers as meaningful as possible. They don t have to be paragraphs. In fact, if it takes a paragraph to explain what a variable represents, perhaps you need to think about your design again. Or at the least, use a comment. But don t make them terse! Take a lesson from the core APIs. They could have called ArInBException, but instead they called it ArrayIndexOutOfBoundsException. Is there any question about what that exception represents Of course, the big Sun faux pas was the infamous NullPointerException. But despite the use of the forbidden word pointer, everybody knows what it means when they get it. But there could be some confusion if it were called NPTException or even NullException.
Use the Core APIs!
Do not reinvent the wheel, and do not or you ll automatically fail for certain use any libraries other than code you developed and the core Java APIs. Resist any temptation to think that you can build something faster, cleaner, more efficient, etc. Even if that s true, it isn t worth giving up the benefit of using standard classes that others are familiar with, and that have been extremely, heavily tested in the field.
Make Your Own Exception Classes If You Can t Find One That Suits Your Needs
If there isn t a perfect checked Exception class for you in java.lang, then create your own. And make it specific enough to be meaningful to the catcher. In other words, don t make a BadThingHappenedException and throw it for every possible business error that occurs in your program.
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