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  1. import java.io.IOException;
  2. import java.io.UnsupportedEncodingException;
  3. import java.nio.ByteBuffer;
  4. import java.nio.CharBuffer;
  5. import java.nio.charset.CharacterCodingException;
  6. import java.nio.charset.Charset;
  7. import java.nio.charset.CharsetDecoder;
  8. import java.text.ParseException;
  9.  
  10. class Main{
  11.     public static void main(String[] args) throws IOException, ParseException {
  12.         StringBuilder sb1 = new StringBuilder("abcdefghijklmnopqrstuvwxyz");
  13.         for (int i=0;i<15;i++) {
  14.             sb1.append(sb1);
  15.         }
  16.         System.out.println("Size of buffer: "+sb1.length());
  17.         byte[] src = sb1.toString().getBytes("UTF-8");
  18.         StringBuilder res = null;
  19.  
  20.         long startTime = System.currentTimeMillis();
  21. 	for (int i=0;i<100;i++)
  22.             res = testStringConvert(src);
  23.         System.out.println("Conversion using String time (msec): "+(System.currentTimeMillis()-startTime));
  24.         if (!res.toString().equals(sb1.toString())) {
  25.             System.err.println("Conversion error");
  26.         }
  27.  
  28.         startTime = System.currentTimeMillis();
  29.         for (int i=0;i<100;i++)
  30.             res = testCBConvert(src);
  31.         System.out.println("Conversion using CharBuffer time (msec): "+(System.currentTimeMillis()-startTime));
  32.         if (!res.toString().equals(sb1.toString())) {
  33.             System.err.println("Conversion error");
  34.         }
  35.     }
  36.  
  37.     private static StringBuilder testStringConvert(byte[] src) throws UnsupportedEncodingException {
  38.         String s = new String(src, "UTF-8");
  39.         StringBuilder b = new StringBuilder(s);
  40.         return b;
  41.     }
  42.  
  43.     private static StringBuilder testCBConvert(byte[] src) throws CharacterCodingException {
  44.         Charset charset = Charset.forName("UTF-8");
  45.         CharsetDecoder decoder = charset.newDecoder();
  46.         ByteBuffer srcBuffer = ByteBuffer.wrap(src);
  47.         CharBuffer resBuffer = decoder.decode(srcBuffer);
  48.         StringBuilder b = new StringBuilder(resBuffer);
  49.         return b;
  50.     }
  51. }
Success #stdin #stdout 4.64s 246080KB
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stdin
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Standard input is empty
stdout
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Size of buffer: 851968
Conversion using String time (msec): 1018
Conversion using CharBuffer time (msec): 3629
https://ideone.com/jIY7V
language:
Java (HotSpot 12)
created:
12 years ago
visibility:
public

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