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POWhy adding a try block makes the program faster?
 

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    <p>I am using the following code to test how slow a try block is. To my surprise, the try block makes it faster. Why?</p> <pre><code>public class Test { int value; public int getValue() { return value; } public void reset() { value = 0; } // Calculates without exception public void method1(int i) { value = ((value + i) / i) &lt;&lt; 1; // Will never be true if ((i &amp; 0xFFFFFFF) == 1000000000) { System.out.println("You'll never see this!"); } } public static void main(String[] args) { int i; long l; Test t = new Test(); l = System.currentTimeMillis(); t.reset(); for (i = 1; i &lt; 100000000; i++) { t.method1(i); } l = System.currentTimeMillis() - l; System.out.println("method1 took " + l + " ms, result was " + t.getValue()); // using a try block l = System.currentTimeMillis(); t.reset(); for (i = 1; i &lt; 100000000; i++) { try { t.method1(i); } catch (Exception e) { } } l = System.currentTimeMillis() - l; System.out.println("method1 with try block took " + l + " ms, result was " + t.getValue()); } } </code></pre> <p>My machine is running 64-bit Windows 7 and 64-bit JDK7. I got the following result:</p> <pre><code>method1 took 914 ms, result was 2 method1 with try block took 789 ms, result was 2 </code></pre> <p>And I have run the code many times and every time I got almost the same result.</p> <p><strong>Update:</strong></p> <p>Here is the result of running the test ten times on a MacBook Pro, Java 6. Try-catch makes the method faster, same as on windows.</p> <pre><code>method1 took 895 ms, result was 2 method1 with try block took 783 ms, result was 2 -------------------------------------------------- method1 took 943 ms, result was 2 method1 with try block took 803 ms, result was 2 -------------------------------------------------- method1 took 867 ms, result was 2 method1 with try block took 745 ms, result was 2 -------------------------------------------------- method1 took 856 ms, result was 2 method1 with try block took 744 ms, result was 2 -------------------------------------------------- method1 took 862 ms, result was 2 method1 with try block took 744 ms, result was 2 -------------------------------------------------- method1 took 859 ms, result was 2 method1 with try block took 765 ms, result was 2 -------------------------------------------------- method1 took 937 ms, result was 2 method1 with try block took 767 ms, result was 2 -------------------------------------------------- method1 took 861 ms, result was 2 method1 with try block took 744 ms, result was 2 -------------------------------------------------- method1 took 858 ms, result was 2 method1 with try block took 744 ms, result was 2 -------------------------------------------------- method1 took 858 ms, result was 2 method1 with try block took 749 ms, result was 2 </code></pre>
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    1. USWei Liu
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    1. COThis is out of the scope of the question, but you should use `System.nanoTime` to compare the data. Read [System.currentTimeMillis vs System.nanoTime](http://stackoverflow.com/q/351565/1065197).
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      1. USLuiggi Mendoza
    2. CO@RahulAgrawal I swapped the code and got the same result.
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    3. COI made many tests around OP's code, and I confirm his finding.
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      1. USDenys Séguret
 

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