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that having good data structures, or using good algorithms It is making code that is both easy and inviting to read If you read a good textbook, for example, you will find it is more than just a collection of words and sentences It will have a definite style to it The first page of each chapter will have a specific and consistent design The chapters will be broken down into parts or sections that also follow a design There will be a consistency as to how the pages look, how the figures are arranged There will be conscious use of whitespace to make the book easier to read There will be a significant degree of artistry that has gone into the design of the book The same should be true for computer code Many programmers try to cram as much code into as small a space as possible This is not good programming You should use design principles when laying out your code, just as is done when a book is printed One thing that many programmers don't seem to realize is that liberal, but deliberate use of whitespace can make a program much easier to read1 The following are some of the layout principles I find important:
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Use a fixed format for each class definition, and each method definition Use whitespace to make them stand out Often comments with a consistent style help Indentation should indicate code structure It should make the code easy to read I like to indent my code using multiples of four spaces I line up ifs and elses I put braces on lines by themselves because that has a real visual impact on making the code easier to read While the most common Java standard is to put the leading brace on the same line as its associated control statement, I find this makes the code more difficult to read I find the bit of extra whitespace accompanied by the quick visual matching of braces makes the each brace on its own line much more pleasant to read
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file:///C|/oobook/11html (5 of 23) [13/03/2003 02:55:44 }
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Take as much care laying out comments as you do laying out code Remember white space Group comments together I like to use trailing comments when appropriate, and I try to keep plenty of white space when possible, and to line them up in columns with each other Good names for classes, methods, and variables are important, too I find that the Java capitalization standard leads to the most readable names I've found so far It now seems so obviously better to me than other naming conventions that I wonder why it took so long to develop
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Know What You Are Doing It really does help to understand what you are doing Take the time you need to understand the problem, the computer, the programming language For example, it really does help you program better if you understand shallow vs deep copy or how the Java runtime works It does help to look at Swing with object-oriented eyes Write Practice Programs Whenever I move to new system (a new operating system, a new programming language, a new GUI, etc), I spend a week or two learning about it by writing a few practice programs, or getting some program you've worked with before to run I can't really count the number of times the first thing I did when moving to a new system was to get my editor working on that system When I'm moving to an environment when that wouldn't work, I try to get a few simple programs working It is important to get a reasonable understanding of the tools (editors, compilers, etc) available with the new system, as well as how it works Once I have the basics down, I can move on to something real
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file:///C|/oobook/11html (6 of 23) [13/03/2003 02:55:44 }
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