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The certification costs $400 total ($250 for the Assignment portion and
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code in your project. Every line must be coded by you.
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The Assignment is graded by giving your application a starting number of points
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and then deducting points for violations including minor things (curly braces in the wrong place) and major things (locking doesn t work in every situation).
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The exam Assessors are more interested in the clarity and maintainability of
your code than they are in your clever algorithms.
Think like a Team Player rather than a lone coding maverick, even if it
means your design and implementation are sometimes slightly less efficient, but more easily understood by others.
Coding Standards
CERTIFICATION OBJECTIVES
Use Sun Java Coding Standards
11: Coding Standards
CERTIFICATION OBJECTIVE
Use Sun Java Coding Standards
The Developer exam is challenging. There are a lot of complex design issues to consider, and a host of advanced Java technologies to understand and implement correctly. The exam assessors work under very strict guidelines. You can create the most brilliant application ever to grace a JVM, but if you don t cross your t s and dot your i s the assessors have no choice but to deduct crucial (and sometimes substantial) points from your project. This chapter will help you cross your t s and dot your i s. Following coding standards is not hard; it just requires diligence. If you are careful it s no-brainer stuff, and it would be a shame to lose points because of a curly brace in the wrong place. The Developer exam stresses things that must be done to avoid automatic failure. The exam uses the word must frequently. When we use the word must, we use it in the spirit of the exam, if you must you must, so just get on with it. Let s dive into the fascinating world of Java Coding Standards.
Spacing Standards
This section covers the standards for indenting, line-length limits, line breaking, and white space.
Indenting
We said this was going to be fascinating didn t we Each level of indentation must be four spaces, exactly four spaces, always four spaces. Tabs must be set to eight spaces. If you are in several levels of indentation you can use a combination of tabs and (sets of four) spaces to accomplish the correct indentation. So if you are in a method and you need to indent 12 spaces, you can either press SPACEBAR 12 times, or press TAB once and then press SPACEBAR four times. (Slow down coach.) We recommend not using the TAB key, and sticking to the SPACEBAR it s just a bit safer. When to Indent If you indent like this, you ll make your assessor proud:
Beginning comments, package declarations, import statements, interface
declarations, and class declarations should not be indented.
Use Sun Java Coding Standards
Static variables, instance variables, constructors, methods, and their respective
comments* should be indented one level.
Within constructors and methods, local variables, statements, and their
comments should be indented another level.
Statements (and their comments) within block statements should be indented
another level for each level of nesting involved. (Don t worry, we ll give you an example.) The following listing shows proper indenting:
public class Indent { static int staticVar = 7; public Indent() { } public static void main(String [] args) { int x = 0; for(int z=0; z<7; z++) { x = x + z; if (x < 4) { x++; } } } }
Line Lengths and Line Wrapping
The general rule is that a line shouldn t be longer than 80 characters. We recommend 65 characters just to make sure that a wide variety of editors will handle your code gracefully. When a line of code is longer than will fit on a line there are some line wrapping guidelines to follow. We can t say for sure that these are a must, but if you follow these guidelines you can be sure that you re on safe ground:
Break after a comma. Break before an operator. *
Rules about comments are coming soon!
11: Coding Standards
Align the new line a tab (or eight spaces) beyond the beginning of the line
being broken.
Try not to break inside an inner parenthesized expression. (Hang on, the
example is coming.) The following snippet demonstrates acceptable line wrapping:
/* example of a line wrap */ System.out.println(((x * 42) + (z - 343) + (x % z )) + numberOfParsecs); /* example of a line wrap for a method */ x = doStuffWithLotsOfArgs(coolStaticVar, instanceVar, numberOfParsecs, reallyLongShortName, x, z);
White Space
Can you believe we have to go to this level of detail It turns out that if you don t parcel out your blank spaces as the standards say you should, you can lose points. With that happy thought in mind, let s discuss the proper use of blank lines and blank statements. The Proper Use of Blank Lines Blank lines are used to help readers of your code (which might be you, months after you wrote it) to easily spot the logical blocks within your source file. If you follow these recommendations in your source files, your blank line worries will be over. Use a blank line,
Between methods and constructors After your last instance variable Inside a method between the local variables and the first statement Inside a method to separate logical segments of code Before single line or block comments
Use two blank lines between the major sections of the source file: the package, the import statement(s), the class, and the interface.
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