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Obviously, it’s best to avoid either of these extremes, to keep objects large enough to take on a substantial role in the program but small enough to keep that role well-defined. The structure of the program should be easy to grasp in the pattern of object connections. Nevertheless, the question often arises of whether to add more functionality to a class or to factor out the additional functionality and put it in an separate class definition. For example, a Faucet needs to keep track of how much water is being used over time.

You don’t need to arrange for it specially, so your design never needs to bother with what’s being done when. Dynamic Loading The usual rule has been that, before a program can run, all its parts must be linked together in one file. When it’s launched, the entire program is loaded into memory at once. Some object-oriented programming environments overcome this constraint and allow different parts of an executable program to be kept in different files. The program can be launched in bits and pieces as they’re needed.

Your projects can be prototyped faster, completed faster, with less of a collaborative challenge at your own site. The increased reusability of object-oriented code also increases its reliability. A class taken from a library is likely to have found its way into a variety of different applications and situations. The more the code has been used, the more likely it is that problems will have been encountered and fixed. Bugs that would have seemed strange and hard to find in your program might already have been tracked down and eliminated.

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