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  1. import java.io.*;
  2.  
  3. class StaticVsInstanceBenchmark
  4. {
  5.     public static void main( String[] args ) throws Exception
  6.     {
  7.         StaticVsInstanceBenchmark program = new StaticVsInstanceBenchmark();
  8.         program.run();
  9.     }
  10.  
  11.     static final int DURATION = 1000;
  12.  
  13.     public void run() throws Exception
  14.     {
  15.     	doBenchmark( new VirtualTest( new ClassWithVirtualMethod() ), 
  16.     	             new NonVirtualTest( new ClassWithNonVirtualMethod() ), 
  17.     	             new StaticTest() );
  18.     }
  19.  
  20.     void doBenchmark( Test... tests ) throws Exception
  21.     {
  22.       	System.out.println( "  Name          |  Iterations" );
  23.         doBenchmark2( devNull, 1, tests ); //warmup
  24.     	doBenchmark2( System.out, DURATION, tests );
  25.        	System.out.println( "Done." );
  26.     }
  27.  
  28.     void doBenchmark2( PrintStream printStream, int duration, Test[] tests ) throws Exception
  29.     {
  30.         for( Test test : tests )
  31.         {
  32.         	long iterations = runTest( duration, test );
  33.           	printStream.printf( "%15s | %10d\n", test.getClass().getSimpleName(), iterations );
  34.         }
  35.     }
  36.  
  37.     long runTest( int duration, Test test ) throws Exception
  38.     {
  39.         test.terminate = false;
  40.         test.count = 0;
  41.     	Thread thread = new Thread( test );
  42.         thread.start();
  43.         Thread.sleep( duration );
  44.         test.terminate = true;
  45.         thread.join();
  46.         return test.count;
  47.     }
  48.  
  49.     static abstract class Test implements Runnable
  50.     {
  51.         volatile boolean terminate = false;
  52.         long count = 0;
  53.     }
  54.  
  55.     static class ClassWithStaticStuff
  56.     {
  57. 		static int staticDummy;
  58.         static void staticMethod() { staticDummy++; }
  59.     }
  60.  
  61.     static class StaticTest extends Test
  62.     {
  63.         @Override
  64.         public void run()
  65.         {
  66.             for( count = 0;  !terminate;  count++ )
  67.             {
  68.             	ClassWithStaticStuff.staticMethod();
  69.             }
  70.         }
  71.     }
  72.  
  73.     static class ClassWithVirtualMethod implements Runnable
  74.     {
  75. 		int instanceDummy;
  76.         @Override public void run() { instanceDummy++; }
  77.     }
  78.  
  79.     static class VirtualTest extends Test
  80.     {
  81.     	final Runnable runnable;
  82.  
  83.     	VirtualTest( Runnable runnable )
  84.     	{
  85.     		this.runnable = runnable;
  86.     	}
  87.  
  88.         @Override
  89.         public void run()
  90.         {
  91.             for( count = 0;  !terminate;  count++ )
  92.             {
  93.             	runnable.run();
  94.             }
  95.         }
  96.     }
  97.  
  98.     static class ClassWithNonVirtualMethod
  99.     {
  100. 		int instanceDummy;
  101.         final void nonVirtualMethod() { instanceDummy++; }
  102.     }
  103.  
  104.     static class NonVirtualTest extends Test
  105.     {
  106.     	final ClassWithNonVirtualMethod objectWithNonVirtualMethod;
  107.  
  108.     	NonVirtualTest( ClassWithNonVirtualMethod objectWithNonVirtualMethod )
  109.     	{
  110.     		this.objectWithNonVirtualMethod = objectWithNonVirtualMethod;
  111.     	}
  112.  
  113.         @Override
  114.         public void run()
  115.         {
  116.             for( count = 0;  !terminate;  count++ )
  117.             {
  118.             	objectWithNonVirtualMethod.nonVirtualMethod();
  119.             }
  120.         }
  121.     }
  122.  
  123.     static final PrintStream devNull = new PrintStream( new OutputStream() 
  124.     {
  125.         public void write(int b) {}
  126.     } );
  127. }
  128.  
Success #stdin #stdout 3.06s 711168KB
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stdin
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Standard input is empty
stdout
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  Name          |  Iterations
    VirtualTest |  343338494
 NonVirtualTest |  566721054
     StaticTest |  613975425
Done.
https://ideone.com/PLCaoC
method calls benchmark
language:
Java (HotSpot 12)
created:
8 years ago
visibility:
public

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