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圣淘沙娱乐城在线博彩在他们吃下丹药之后

2016-03-10 来源: 作者:陈延鹏 责任编辑:田艳敏

摘 要:圣淘沙娱乐城在线博彩在他们吃下丹药之后 y7ic82

 圣淘沙娱乐城在线博彩在他们吃下丹药之后

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圣淘沙娱乐城在线博彩在他们吃下丹药之后

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How to Apply the GuidelineFollowing this guideline is not difficult when you know the right techniques, but itrequires discipline. This section presents two techniques that we find particularlyimportant. When writing a new unit, never let it grow beyond 15 lines of code. Thatmeans that well before you reach 15 lines of code, you need to start thinking abouthow to add further functionality. Does it really belong in the unit you are writing, orshould it go into its own unit? When a unit grows beyond 15 lines of code despiteyour efforts, you need to shorten it.Using Refactoring Techniques to Apply the GuidelineThis section discusses two refactoring techniques to apply the guideline and achieveshorter units of code.Refactoring technique: Extract MethodOne refactoring technique that works in this case is Extract MethodRefactoring technique: Replace Method with Method ObjectCommon Objections to Writing Short UnitsWhile writing short units may sound simple, software developers often find it quitedifficult in practice. The following are typical objections to the principle explained inthis chapter.Objection: Having More Units Is Bad for Performance“Writing short units means having more units, and therefore more method calls. Thatwill never perform.”Indeed, theoretically, there is a performance penalty for having more units. There willbe more method invocations (compared to having fewer, longer units). For each invo‐cation, a bit of work needs to be done by the Java Virtual Machine (JVM). In practice,this is almost never a problem. In the worst case, we are talking about microseconds.Unless a unit is executed hundreds of thousands of times in a loop, the performancepenalty of a method invocation is not noticeable. Also, the JVM is very good at opti‐mizing the overhead of method invocations.Except for very specific cases in enterprise software development, you can focus onmaintainability without sacrificing performance. An example is when a method isinvoked hundreds of thousands of times in the case of certain algorithms. This isprobably one of the very few cases in a programmer’s life where you can have yourcake and eat it too. We are not saying that there are no performance issues in enter‐prise software development; however, they seldom, if ever, are caused by excessivemethod calling.Do not sacrifice maintainability to optimize for performance,unless solid performance tests have proven that you actually have aperformance problem and your performance optimization actuallymakes a difference.Objection: Code Is Harder to Read When Spread Out“Code becomes harder to read when spread out over multiple units.”Well, psychology says that is not the case. People have a working memory of aboutseven items, so someone who is reading a unit that is significantly longer than sevenlines of code cannot process all of it. The exception is probably the original author ofa piece of source code while he or she is working on it (but not a week later).Write code that is easy to read and understand for your successors(and for your future self).读书笔记:Building Maintainable Software: Ten Guidelines for Future-Proof Codeby Joost VisserCopyright © 2016 Software Improvement Group, B.V. All rights reserved.Printed in the United States of America.Published by O’Reilly Media, Inc., 1005 Gravenstein Highway North, Sebastopol, CA 95472.O’Reilly books may be purchased for educational, business, or sales promotional use. Online editions arealso available for most titles (http://safaribooksonline.com). For more information, contact our corporate/institutional sales department: 800-998-9938 or corporate@oreilly.com.Acquisitions Editor: Rachel RoumeliotisEditor: Nan BarberProduction Editor: Matthew HackerCopyeditor: Rachel MonaghanProofreader: Marta JustakIndexer: WordCo Indexing Services, Inc.Interior Designer: David FutatoCover Designer: Randy ComerIllustrator: Rebecca DemarestFebruary 2016: First EditionRevision History for the First Edition2016-01-25: First ReleaseSee http://oreilly.com/catalog/errata.csp?isbn=9781491940662 for release details. 易发国际娱乐城博彩网说明你们还不想死

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p>) 在 SQL 语句中派生表的应用甚至比表连接更加强大,下面圣淘沙娱乐城在线博彩在他们吃下丹药之后 就要讲到表连接 其中包括的直接派生类有:[FieldAccessException][6]、[MethodAccessException][6]、[MissingMemberException][6]与数组有关的异常 这就是圣淘沙娱乐城在线博彩在他们吃下丹药之后 最为常用的[IndexOutOFRangeException][6]异常类,具体的用法圣淘沙娱乐城在线博彩在他们吃下丹药之后 在赘述 博E百娱乐城澳门博彩而是垃圾一般

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原标题:圣淘沙娱乐城在线博彩在他们吃下丹药之后
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