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    <p>This is variation on Bozho example. It runs longer and re-uses the same objects so the cache size doesn't matter so much. I also use an array so there is no overhead from the iterator.</p> <pre><code>public static void main(String[] args) { Random random = new Random(); int testLength = 200 * 1000 * 1000; Foo[] foos = new Foo[testLength]; Bar[] bars = new Bar[testLength]; Foo1Impl foo1 = new Foo1Impl(); Foo2Impl foo2 = new Foo2Impl(); Bar1Impl bar1 = new Bar1Impl(); Bar2Impl bar2 = new Bar2Impl(); for (int i = 0; i &lt; testLength; i++) { boolean flip = random.nextBoolean(); foos[i] = flip ? foo1 : foo2; bars[i] = flip ? bar1 : bar2; } long start; start = System.nanoTime(); for (Foo foo : foos) { foo.foo(); } System.out.printf("The average abstract method call was %.1f ns%n", (double) (System.nanoTime() - start) / testLength); start = System.nanoTime(); for (Bar bar : bars) { bar.bar(); } System.out.printf("The average interface method call was %.1f ns%n", (double) (System.nanoTime() - start) / testLength); } </code></pre> <p>prints</p> <pre><code>The average abstract method call was 4.2 ns The average interface method call was 4.1 ns </code></pre> <p>if you swap the order the tests are run you get</p> <pre><code>The average interface method call was 4.2 ns The average abstract method call was 4.1 ns </code></pre> <p>There is more difference in how you run the test than which one you chose.</p> <p>I got the same result with Java 6 update 26 and OpenJDK 7.</p> <hr> <p>BTW: If you add a loop which only call the same object each time, you get</p> <pre><code>The direct method call was 2.2 ns </code></pre>
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    1. POWhy are interface method invocations slower than concrete invocations?
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    1. USPeter Lawrey
    1. USPeter Lawrey
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    1. COSo interfaces are twice as slow as direct. Is this after JIT compiling?
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      1. USKevin Kostlan
 

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