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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. import java.io.UnsupportedEncodingException;
  7.  
  8. /**
  9.  *@author rpax - http://stackoverflow.com/questions/22441079/is-it-correct-efficient-to-call-trim-after-a-byte-to-string-conversion
  10.  **/
  11. class Test {
  12.  
  13. 	/**
  14. 	 * 
  15. 	 * @param args
  16. 	 */
  17. 	public static void main(String[] args) {
  18. 		byte[] barray= new byte[9999999];
  19. 		barray[0]=72;
  20. 		barray[1]=101;
  21. 		barray[2]=0;
  22. 		barray[3]=108;
  23. 		barray[4]=111;
  24. 		barray[5]=33;
  25. 		for (int k = 6; k < barray.length; k++) {
  26. 			barray[k]=0;
  27. 		}
  28. 		try {
  29. 			long c=System.nanoTime();
  30. 			System.out.println(convertFromByteArray2(barray));
  31. 			long d=System.nanoTime();
  32. 			long tot_2=d-c;
  33. 			long a=System.nanoTime();
  34. 			System.out.println(convertFromByteArray(barray));
  35. 			long b=System.nanoTime();
  36. 			long tot_1=b-a;
  37.  
  38. 			System.out.println(tot_1 +" - "+tot_2+" "+(tot_1*1.0/tot_2));
  39.  
  40. 		} catch (UnsupportedEncodingException e) {
  41. 			// TODO Auto-generated catch block
  42. 			e.printStackTrace();
  43. 		}
  44.  
  45. 	}
  46. 	public static String convertFromByteArray(byte[] a) throws UnsupportedEncodingException{
  47. 	    String s = new String(a,"UTF-8");
  48. 	    return s.trim();
  49. 	}
  50. 	public static String convertFromByteArray2(byte[] barray) throws UnsupportedEncodingException {
  51. 		int i=barray.length-1;
  52.         while(barray[i--]==0 && i>=0);
  53. 		return new String(barray,0,i+2,"UTF-8");
  54. 	}
  55.  
  56. }
  57.  
Success #stdin #stdout 0.21s 380608KB
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Helo!
Helo!
85980366 - 21438869 4.010489825745938
https://ideone.com/mg2U23
language:
Java (HotSpot 12)
created:
10 years ago
visibility:
public

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