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    <p>All right, after <a href="https://stackoverflow.com/questions/141560/should-trycatch-go-inside-or-outside-a-loop#141652">Jeffrey L Whitledge said</a> that there was no performance difference (as of 1997), I went and tested it. I ran this small benchmark:</p> <pre><code>public class Main { private static final int NUM_TESTS = 100; private static int ITERATIONS = 1000000; // time counters private static long inTime = 0L; private static long aroundTime = 0L; public static void main(String[] args) { for (int i = 0; i &lt; NUM_TESTS; i++) { test(); ITERATIONS += 1; // so the tests don't always return the same number } System.out.println("Inside loop: " + (inTime/1000000.0) + " ms."); System.out.println("Around loop: " + (aroundTime/1000000.0) + " ms."); } public static void test() { aroundTime += testAround(); inTime += testIn(); } public static long testIn() { long start = System.nanoTime(); Integer i = tryInLoop(); long ret = System.nanoTime() - start; System.out.println(i); // don't optimize it away return ret; } public static long testAround() { long start = System.nanoTime(); Integer i = tryAroundLoop(); long ret = System.nanoTime() - start; System.out.println(i); // don't optimize it away return ret; } public static Integer tryInLoop() { int count = 0; for (int i = 0; i &lt; ITERATIONS; i++) { try { count = Integer.parseInt(Integer.toString(count)) + 1; } catch (NumberFormatException ex) { return null; } } return count; } public static Integer tryAroundLoop() { int count = 0; try { for (int i = 0; i &lt; ITERATIONS; i++) { count = Integer.parseInt(Integer.toString(count)) + 1; } return count; } catch (NumberFormatException ex) { return null; } } } </code></pre> <p>I checked the resulting bytecode using javap to make sure that nothing got inlined.</p> <p>The results showed that, assuming insignificant JIT optimizations, <strong>Jeffrey is correct</strong>; there is absolutely <strong>no performance difference on Java 6, Sun client VM</strong> (I did not have access to other versions). The total time difference is on the order of a few milliseconds over the entire test.</p> <p>Therefore, the only consideration is what looks cleanest. I find that the second way is ugly, so I will stick to either the first way or <a href="https://stackoverflow.com/questions/141560/should-trycatch-go-inside-or-outside-a-loop#141589">Ray Hayes's way</a>.</p>
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    1. USMichael Myers
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    1. COIf the exception-handler takes flow outside the loop, then I feel it's clearest to place it *outside* the loop -- Rather than placing a catch clause apparently within the loop, which nevertheless returns. I use a line of whitespace around the "caught" body of such "catch-all" methods, to more clearly separate the _body_ from the _all-enclosing try block_.
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      1. USThomas W
 

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