Always Test the Software running in the Same Way that Customer will run it

Some programmers have their own favorite ways to run the software they are working on, that is run differently than the way that the customer will run it.  This is evil.  Programmer is not testing what the customer will get, but testing something else.  Is that good enough?

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Correctly Converting Integer to String

Learn to use Integer.toString(i) when you need a string that represents an integer.  This is always the most efficient way to convert, and it avoids some bad habits that can be expensive.