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By William C. Wake

You recognize what XP is, how you can get it up and working, and the way to devise initiatives utilizing it. Now its time to extend your use of maximum Programming and examine the easiest practices of this well known self-discipline. In severe Programming Explored, you could examine most sensible practices as discovered from the concrete event of winning XP builders. writer and programmer invoice Wake offers solutions to functional questions on XP implementation. utilizing hands-on examples--including code samples written within the Java programming language--this ebook demonstrates the daily mechanics of engaged on an XP workforce and exhibits well-defined tools for accomplishing a winning XP undertaking. The publication is split into 3 elements: *Part 1, Programming--programming incrementally, test-first, and refactoring. *Part 2, crew Practices--code possession, integration, extra time, and pair programming; how XP ways approach structure; and the way a procedure metaphor shapes a typical imaginative and prescient, a shared vocabulary, and the structure. *Part three, Processes--how to write down tales to plot a free up; the best way to plan iterations; and the actions in a customary day for the client, the programmer, and the executive of an XP undertaking. To demonstr

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Conclusion What have we seen? We can make very small, incremental improvements to the code. At each point, the latest version is better than the one before. ” ✧ The unit tests acted as a constant safety net. We never go more than a few minutes without the reassurance they provide. ✧ Some improvements allow further improvements. The need for a template class was far less obvious in the initial code. ✧ 46 While it’s possible that some refactorings may interfere with performance, they will often open up possibilities for dramatic improvements.

They are often described as “once and only once” (“once” to work; “only once” to avoid duplication). Going to Work When you considered the sample code, what smells did you find? Here is what I saw: ✧ ✧ ✧ ✧ ✧ ✧ ✧ ✧ ✧ ✧ ✧ ✧ ✧ Long class Long method Variables could be local to method Useless method comment Could we read template once, instead of each time? =” for string compare Use of StringBuffer without append Re-allocating StringBuffer in loop The close() methods are not in catch or finally clause Inconsistent/unclear exception handling Lots of string addition Almost-duplicate code in handling “%CODE%” and “%ALTCODE%” 35 Lots of extraneous “new String() ”s ✧ Magic numbers (6 and 9) and symbols ✧ Lots of temporary variables ✧ The worst smell is that long substitute() method, so use Extract Method to break it up.

Look at the original code above, and see what problems you can identify. ) A Catalog of Refactorings About half of Martin Fowler’s Refactoring book is devoted to a catalog of refactorings. Each of these is a relatively simple transformation; Fowler explains the mechanics of the change, and provides examples. 33 For example: Extract Method Before After // Assume all are instance // variables void f() { ... // Compute score score = a * b + c; score -= discount; } void f() { ... toString(); This refactoring lets us replace the easy-to-read String version with a more efficient StringBuffer version (or vice versa: many refactorings are appropriate to use “backwards”).

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