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31. Layout and Style
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Contents 31.1 Layout Fundamentals
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31.2 Layout Techniques 31.3 Layout Styles 31.4 Laying Out Control Structures 31.5 Laying Out Individual Statements 31.6 Laying Out Comments 31.7 Laying Out Routines 31.8 Laying Out Classes
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Related Topics Self-documenting code: 32
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THIS CHAPTER TURNS TO AN AESTHETIC ASPECT of computer programming the layout of program source code. The visual and intellectual enjoyment of well-formatted code is a pleasure that few nonprogrammers can appreciate. But programmers who take pride in their work derive great artistic satisfaction from polishing the visual structure of their code. The techniques in this chapter don t affect execution speed, memory use, or other aspects of a program that are visible from outside the program. They affect how easy it is to understand the code, review it, and revise it months after you write it. They also affect how easy it is for others to read, understand, and modify once you re out of the picture. This chapter is full of the picky details that people refer to when they talk about attention to detail. Over the life of a project, attention to such details makes a difference in the initial quality and the ultimate maintainability of the code you write. Such details are too integral to the coding process to be changed effectively later. If they re to be done at all, they must be done during initial construction. If you re working on a team project, have your team read this chapter and agree on a team style before you begin coding.
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31. Layout and Style
Page 2
You might not agree with everything you read here. But the point is less to win your agreement than to convince you to consider the issues involved in formatting style. If you have high blood pressure, move on to the next chapter. It s less controversial.
31.1 Layout Fundamentals
This section explains the theory of good layout. The rest of the chapter explains the practice.
Layout Extremes
Consider the routine shown in Listing 31-1:
Listing 31-1. Java layout example #1.
/* Use the insertion sort technique to sort the "data" array in ascending order. This routine assumes that data[ firstElement ] is not the first element in data and that data[ firstElement-1 ] can be accessed. */ public void InsertionSort( int[] data, int firstElement, int lastElement ) { /* Replace element at lower boundary with an element guaranteed to be first in a sorted list. */ int lowerBoundary = data[ firstElement-1 ]; data[ firstElement-1 ] = SORT_MIN; /* The elements in positions firstElement through sortBoundary-1 are always sorted. In each pass through the loop, sortBoundary is increased, and the element at the position of the new sortBoundary probably isn't in its sorted place in the array, so it's inserted into the proper place somewhere between firstElement and sortBoundary. */ for ( int sortBoundary = firstElement+1; sortBoundary <= lastElement; sortBoundary++ data[ insertPos-1 ] ) { data[ insertPos ] = data[ insertPos-1 ]; insertPos = insertPos-1; } data[ insertPos ] = insertVal; } /* Replace original lower-boundary element */ data[ firstElement-1 ] = lowerBoundary; } ) { int insertVal = data[ sortBoundary ]; int insertPos = sortBoundary; while ( insertVal <
1 CODING HORROR
The routine is syntactically correct. It s thoroughly commented and has good variable names and clear logic. If you don t believe that, read it and find a mistake! What the routine doesn t have is good layout. This is an extreme example, headed toward negative infinity on the number line of bad-to-good layout. Listing 31-2 is a less extreme example:
Listing 31-2. Java layout example #2.
/* Use the insertion sort technique to sort the "data" array in ascending order. This routine assumes that data[ firstElement ] is not the first element in data and that data[ firstElement-1 ] can be accessed. */ public void InsertionSort( int[] data, int firstElement, int lastElement ) { /* Replace element at lower boundary with an element guaranteed to be first in a sorted list. */ int lowerBoundary = data[ firstElement-1 ];
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