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  1. class Volatile
  2. {
  3.     private volatile static int ile1 = 0;
  4.     private static int ile2 = 0;
  5.     //------------------------
  6.     public static void main(String[] args)
  7.     {
  8.         int ileRazy = 10000;
  9.         try
  10.         {
  11.             ileRazy = Integer.parseInt(args[0]);
  12.         }
  13.         catch(Exception e)
  14.         {
  15.         }
  16.         long start = System.nanoTime(); 
  17.         for(int i=0;i<ileRazy;i++)
  18.         {
  19.             compute1();
  20.         }
  21.         long end = System.nanoTime();
  22.         System.out.println("Przesuwanie volatile "+(end-start)/Math.pow(10,6));
  23.  
  24.         start = System.nanoTime(); 
  25.         for(int i=0;i<ileRazy;i++)
  26.         {
  27.             compute2();
  28.         }
  29.         end = System.nanoTime();
  30.         System.out.println("Dzielenie volatile "+(end-start)/Math.pow(10,6));       
  31.  
  32.         start = System.nanoTime(); 
  33.         for(int i=0;i<ileRazy;i++)
  34.         {
  35.             compute3();
  36.         }
  37.         end = System.nanoTime();
  38.         System.out.println("Przesuwanie "+(end-start)/Math.pow(10,6));
  39.  
  40.         start = System.nanoTime(); 
  41.         for(int i=0;i<ileRazy;i++)
  42.         {
  43.             compute4();
  44.         }
  45.         end = System.nanoTime();
  46.         System.out.println("Dzielenie "+(end-start)/Math.pow(10,6));      
  47.     }
  48.     //------------------------
  49.     private static void compute1()
  50.     {
  51.         for(int i=0;i<666;i++)
  52.         {
  53.             ile1 = i >> 1;
  54.         }
  55.     }
  56.     //------------------------
  57.     private static void compute2()
  58.     {
  59.         for(int i=0;i<666;i++)
  60.         {
  61.             ile1 = i/2;
  62.         }        
  63.     }
  64.     //------------------------
  65.     private static void compute3()
  66.     {
  67.         for(int i=0;i<666;i++)
  68.         {
  69.             ile2 = i >> 1;
  70.         }        
  71.     }
  72.     //------------------------
  73.     private static void compute4()
  74.     {
  75.         for(int i=0;i<666;i++)
  76.         {
  77.             ile2 = i/2;
  78.         }        
  79.     }      
  80. }
Success #stdin #stdout 0.41s 320704KB
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Przesuwanie volatile 64.848135
Dzielenie volatile 132.449981
Przesuwanie 9.188282
Dzielenie 110.473564
https://ideone.com/qJQiZ7
language:
Java (HotSpot 12)
created:
8 years ago
visibility:
public

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