jimgardener wrote:
> hi
> i tried using nio.charset classes for decoding contents of a text file
> The textfile 'samplein.txt' has 3 lines as below>>
> first
> second
> third
>
> i wrote this code
>
> import java.nio.*;
> import java.nio.charset.*;
> import java.io.*;
> import java.nio.channels.*;
>
> public class CharsetDemo {
>
>
> public static void main(String[] args) {
> String inputfile = "samplein.txt";
>
> try{
> RandomAccessFile inf = new RandomAccessFile( inputfile, "r" );
>
> long leninf=inf.length();
> debug("leninf:"+leninf);
> FileChannel inc = inf.getChannel();
> MappedByteBuffer mapbuf=inc.map(FileChannel.MapMode.READ_ONLY, 0,
> leninf);
>
> Charset latin1 = Charset.forName( "ISO-8859-1" );
> CharsetDecoder decoder = latin1.newDecoder();
> CharBuffer charbuf=decoder.decode(mapbuf);
> debug("cbarraylen:"+charbuf.array().length);
>
> for(char i:charbuf.array()){
> System.out.print(i+"+");
if ( (int)i < 32 )
System.out.print( (int)i );
else
System.out.print(i);
System.out.print('+');
> }
>
>
> }catch(Exception e){
> e.printStackTrace();
> }
>
> }
> public static void debug(String msg){
> System.out.println(msg);
> }
>
> }
>
>
> when i run this i get this output>>
>
> leninf:20
> cbarraylen:20
> f+i+r+s+t+
> +
> +s+e+c+o+n+d+
> +
> +t+h+i+r+d+
>
> i have 2 doubts,
(These are "questions", not "doubts" in Western English)
> there are total 16 characters and 2 newline chars.Then how is it that
> the length of RandomAccessFile and charbuffer array 20?
Make the changes noted above to see why. Consult an ASCII chart.
> I am wondering how the + before s in 'second' is printed. the +
> between 'f+i+r+s+t+' and '+s+e+c+o+n+d+' must be printed when
> newline character is encountered by the for loop's i variable.But i
> can't make out where the extra + (before s) is coming from
Make the changes noted above to see where.
>
> can someone make it clear?
Yes.
http://en.wikipedia.org/wiki/Newline
--
RGB
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