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  1. class Ideone
  2. {
  3. 	public static void main(String[] args)
  4. 	{
  5. 		try (Profile p = new Profile("count from 1 to 1000"))
  6. 		{
  7. 			for (int i = 0; i < 1000; ++i)
  8. 			{
  9. 				// ...
  10. 			}
  11. 		}
  12. 	}
  13. }
  14.  
  15. class Profile implements AutoCloseable
  16. {
  17.     private final String description;
  18.     private final long t0;
  19.  
  20.     public Profile(String description)
  21.     {
  22.         this.description = description;
  23.         t0 = System.nanoTime();
  24.     }
  25.  
  26.     @Override
  27.     public void close()
  28.     {
  29.         long t = System.nanoTime();
  30.         long elapsed = t - t0;
  31.         String unit = "ns";
  32.  
  33.         if (elapsed >= 10_000)
  34.         {
  35.             elapsed /= 1_000;
  36.             unit = "µs";
  37.         }
  38.         if (elapsed >= 10_000)
  39.         {
  40.             elapsed /= 1_000;
  41.             unit = "ms";
  42.         }
  43.         if (elapsed >= 10_000)
  44.         {
  45.             elapsed /= 1_000;
  46.             unit = "s";
  47.         }
  48.         System.out.printf("%4d %s (%s)%n", elapsed, unit, description);
  49.     }
  50. }
  51.  
Success #stdin #stdout 0.1s 320576KB
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  21 µs (count from 1 to 1000)
https://ideone.com/l0jsEy
language:
Java (HotSpot 12)
created:
10 years ago
visibility:
public

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