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    <p>This is the result of your code on my machine:</p> <p>1st run:</p> <pre><code>code block (has Long array) 1 = 6070325 code block (has long array) 2 = 8739868 </code></pre> <p>2nd run:</p> <pre><code>code block (has Long array) 1 = 4449868 code block (has long array) 2 = 6224883 </code></pre> <p>3rd run:</p> <pre><code>code block (has Long array) 1 = 5773081 code block (has long array) 2 = 1160343 </code></pre> <p>I think that your benchmark is badly designed. And if we change the code to this:</p> <pre><code>import java.util.Arrays; public class Test { public static void main(String[] args) { for (int i = 0; i &lt; 10; i++) { System.out.println("Benchmark " + (i + 1)); benchmark(); System.out.println(); } } public static void benchmark() { long startTime; long endTime; Long a[] = new Long[10000]; long b[] = new long[10000]; for (int i = 0; i &lt; a.length; i++) a[i] = 12l; for (int i = 0; i &lt; b.length; i++) b[i] = 12l; //code block 1 startTime = System.nanoTime(); Arrays.sort(a); endTime = System.nanoTime(); System.out.println("\tcode block (has Long array) 1 = " + (endTime - startTime)); //code block 2 startTime = System.nanoTime(); Arrays.sort(b); endTime = System.nanoTime(); System.out.println("\tcode block (has long array) 2 = " + (endTime - startTime)); } } </code></pre> <p>We can see the result you said. This is because of compare method difference in <code>long</code> data type and <code>Long</code> object. You know that the <code>long</code> is a primitive data type but <code>Long</code> is an object. So, to comparing two long value, system can compare them without using any complicated compare method but for comparing two <code>Long</code> object, JVM should use the compare method of <code>Long</code> object and that method takes more time.</p> <p>Note that this is the result of 2nd code:</p> <pre><code>Benchmark 1 code block (has Long array) 1 = 2957778 code block (has long array) 2 = 751911 Benchmark 2 code block (has Long array) 1 = 2081759 code block (has long array) 2 = 392857 Benchmark 3 code block (has Long array) 1 = 2031473 code block (has long array) 2 = 410946 Benchmark 4 code block (has Long array) 1 = 2016387 code block (has long array) 2 = 360241 Benchmark 5 code block (has Long array) 1 = 2070235 code block (has long array) 2 = 360870 Benchmark 6 code block (has Long array) 1 = 2105156 code block (has long array) 2 = 360801 Benchmark 7 code block (has Long array) 1 = 2020928 code block (has long array) 2 = 386013 Benchmark 8 code block (has Long array) 1 = 1976229 code block (has long array) 2 = 359682 Benchmark 9 code block (has Long array) 1 = 5213093 code block (has long array) 2 = 363664 Benchmark 10 code block (has Long array) 1 = 3999880 code block (has long array) 2 = 361638 </code></pre>
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    1. POWhy sorting Long array is slower than sorting long array using Arrays.sort()?
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      1. VTUpMod
    1. COGood work. These numbers are believable.
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      1. USStephen C
 

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