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Article:		Micro-Tuning Step-by-Step
Subject:		Might this not be quicker?
Date:		2002-03-26 05:49:54
From:		godfrer

public boolean checkInteger(String testInteger) { final int length = testInteger.length(); // since we know that the integer must be // between 30 and 39999 inclusive, the length // of the string must be between 2 and 5. if((length < 2) \|\| (length > 5)) return false; if(testInteger.charAt(0) != '3') return false; // no need to actaully calculate the int value // since we know that it starts with 3 and has // a length of between 2 and 5. Just need to // check that all the characters are digits for(int i = 1; i < length; i++) if(!Character.isDigit(testInteger.charAt(i))) return false; // passed all the tests return true; }

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RE:Might this not be quicker?
2002-03-29 11:11:48 steveftoth [View]

Sometimes you have to take a step back from the problem and see what it is that you are really trying to accomplish. This is the major problem with micro-optimising in general. Usually, instead of asking what really need to be done ( like in this case ), we just take what we are given and try to make that faster.