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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. 		//------- sample data
  13. 		List<String> list = new ArrayList<String>();
  14. 		for(int i=0; i<1000000; i++) {
  15. 			list.add("LABEL ...");
  16. 		}
  17.  
  18. 		//------- starts with
  19. 		long start = System.nanoTime();
  20. 		for(String record : list) {
  21. 			if(record.startsWith("LABEL")) System.out.print("");
  22. 		}
  23. 		long end = System.nanoTime();
  24. 		long diffStartsWith = end-start;
  25.  
  26. 		//------- regex
  27. 		start = System.nanoTime();
  28. 		for(String record : list) {
  29. 			if(record.matches("LABEL.*")) System.out.print("");
  30. 		}
  31. 		end = System.nanoTime();
  32. 		long diffRegex = end-start;
  33.  
  34. 		//------- results
  35. 		System.out.printf("StartsWith took %f seconds.%n", Math.pow(10, -9)*(diffStartsWith));
  36. 		System.out.printf("Regex took %f seconds.%n", Math.pow(10, -9)*(diffRegex));
  37. 	}
  38. }
Success #stdin #stdout 2.54s 380608KB
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Standard input is empty
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StartsWith took 0.170032 seconds.
Regex took 2.237698 seconds.
https://ideone.com/RKWH4f
language:
Java (HotSpot 12)
created:
9 years ago
visibility:
public

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