By Joost Visser, Sylvan Rigal, Rob van der Leek, Pascal van Eck, Gijs Wijnholds
Have you felt pissed off operating with an individual else's code? Difficult-to-maintain resource code is a huge challenge in software program improvement this present day, resulting in high priced delays and defects. be a part of the answer. With this sensible e-book, you'll examine 10 easy-to-follow instructions for supplying Java software program that's effortless to take care of and adapt. those instructions were derived from examining hundreds and hundreds of real-world systems.
Written through experts from the software program development workforce (SIG), this publication presents transparent and concise factors, with recommendation for turning the information into perform. Examples for this variation are written in Java, whereas our better half C# e-book presents viable examples in that language.
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Additional info for Building Maintainable Software, Java Edition
Null ? GRAY); } A second, more advanced way to reduce the complexity of the getFlagColors method is to apply a refactoring pattern that separates functionality for different flags in different flag types. You can do this by applying the Replace Conditional with Poly‐ morphism pattern: each flag will get its own type that implements a general interface. The polymorphic behavior of the Java language will ensure that the right functional‐ ity is called during runtime. = null ? getColors(); } This refactoring offers the most flexible implementation.
Do not sacrifice maintainability to optimize for performance, unless solid performance tests have proven that you actually have a performance problem and your performance optimization actually makes a difference. ” Well, psychology says that is not the case. People have a working memory of about seven items, so someone who is reading a unit that is significantly longer than seven lines of code cannot process all of it. The exception is probably the original author of a piece of source code while he or she is working on it (but not a week later).
Still, if we want to test the behavior of this method, we would need six unique test cases (one for each nationality plus one for the default/unclassified case). Writing automated tests might seem excessive for the getFlagColors method, but suppose a developer adds the flag of Luxembourg (which is very similar to the Dutch flag) as a quick fix: ... LIGHT_BLUE); break; case GERMAN: .... Being in a hurry, the developer copied the constructor call for the Dutch flag and updated the last argument to the right color.
Building Maintainable Software, Java Edition by Joost Visser, Sylvan Rigal, Rob van der Leek, Pascal van Eck, Gijs Wijnholds