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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10.  
  11. 	private final static int ITERATIONS = 1000000;
  12. 	private final static String THE_STRING = "A STRING!";
  13.  
  14. 	public static void main (String[] args) throws java.lang.Exception
  15. 	{
  16. 		long startTime = System.nanoTime();
  17. 		for (int i = 0; i < ITERATIONS; i++) {
  18. 			noTemp();
  19. 		}
  20. 		long endTime = System.nanoTime();
  21. 		long duration = (endTime - startTime);
  22.  
  23. 		startTime = System.nanoTime();
  24. 		for (int i = 0; i < ITERATIONS; i++) {
  25. 			withTemp();
  26. 		}
  27. 		endTime = System.nanoTime();
  28. 		long duration2 = (endTime - startTime);
  29.  
  30. 		if (duration < duration2) {
  31. 			System.out.println("noTemp() is faster by "+(duration2 - duration)/1000000d+" ms.");
  32. 		}
  33. 		else {
  34. 			System.out.println("withTemp() is faster by "+(duration - duration2)/1000000d+" ms.");
  35. 		}
  36.  
  37. 	}
  38.  
  39. 	public static void noTemp() {
  40. 		doSomething(getString());
  41. 		doSomething(getString());
  42. 	}
  43.  
  44. 	public static void withTemp() {
  45. 		String s = getString();
  46. 		doSomething(s);
  47. 		doSomething(s);
  48. 	}
  49.  
  50. 	public static String getString() { return THE_STRING; }
  51. 	public static void doSomething(String s){}
  52.  
  53.  
  54. }
Success #stdin #stdout 0.09s 380224KB
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withTemp() is faster by 2.025071 ms.
https://ideone.com/MrlujS
language:
Java (HotSpot 12)
created:
11 years ago
visibility:
public

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