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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. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 		args = new String[] {"Hello", "great", "amazing", "world","of","awesome!"};
  13.  
  14. 		startTimer();
  15. 		StringBuilder message = new StringBuilder();
  16. 		for (String part : args) {
  17. 			if (message.length() != 0)
  18. 				message.append(" ");
  19. 			message.append(part);
  20. 		}
  21. 		System.out.println(message.toString());
  22. 		endTimer();
  23.  
  24. 		startTimer();
  25. 		StringBuilder message2 = new StringBuilder();
  26. 		for (String part : args) {
  27. 			message2.append(part);
  28. 			message2.append(' ');
  29. 		}
  30. 		System.out.println(message2.substring(0, message2.length()-1));
  31. 		endTimer();
  32.  
  33. 		startTimer();
  34. 		message.toString();
  35. 		endTimer();
  36.  
  37. 		startTimer();
  38. 		message.substring(0, message.length()-1);
  39. 		endTimer();
  40. 	}
  41.  
  42. 	private static long timeStart;
  43.  
  44. 	private static void startTimer () {
  45. 		timeStart = System.nanoTime();
  46. 	}
  47.  
  48. 	private static void endTimer () {
  49. 		long c = System.nanoTime()-timeStart;
  50. 		System.out.println("Time: "+c+"ns ("+(c/1000000)+"ms)");
  51. 	}
  52. }
Success #stdin #stdout 0.09s 320320KB
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Standard input is empty
stdout
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Hello great amazing world of awesome!
Time: 453338ns (0ms)
Hello great amazing world of awesome!
Time: 76902ns (0ms)
Time: 2480ns (0ms)
Time: 3104ns (0ms)
https://ideone.com/yCgZsg
language:
Java (HotSpot 12)
created:
10 years ago
visibility:
public

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