Allowing null references to pass through your application, leading to dreaded NullPointerExceptions .
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Returning null when an object is missing, forcing the calling method to use nested if (object != null) checks. java by comparison pdf link
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The authors present a flawed, typical piece of code written by a beginner or intermediate programmer.
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The expression isActive already evaluates to a boolean value. Adding == true is redundant and slows down readability. Eliminate Double Negatives