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I have seen even matured programmers making few mistakes while programming, which might have performance bottleneck. I would like to mention few of such mistakes here.

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A function call takes some resources. Even it seems a simple line of code, Java Runtime has to take case of few things to manage it. Consider following example:

Java Code:

String str = "Lets play football. If you are interested, let me know.";
for (int i=0; i < str.length();i++)

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Tags: efficient, slow program

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Java SE