I was just trying out some very basic comprassion algorithms(hardly comprassed really) and I noaticed that whenever I input 128, the byte not the int, when I read that byte it shows up as 63. Every single time. Im using Java 5 and JCreator 3.50.011.
Here's the code I used to test.

import java.io.*;
 
public class Test 
{
    public static void main(String[] args) 
    {
    	PrintWriter out;
    	BufferedReader in;
    	try
    	{
    		out = new PrintWriter(new FileOutputStream(new File("hello.txt")));
    		out.write(128);
    		out.close();
    	}catch(Exception e)
    	{
    		System.err.println(e);
    	}
    	try
    	{
    		in = new BufferedReader(new FileReader(new File("hello.txt")));
    		System.out.println(in.read());
    	}catch(Exception e)
    	{
    		System.err.println(e);
    	}
    }
}

When I added a for loop to that I got 63 for every number from 128-159.
Does anyone know why this is happning? Any help is greatly appricated.

[gorregisguy]

 

 

I believe this is happening because you are outputting things that are larger than a byte. The byte integer values only go from -128 to 127 IIRC.

 

 

Thanks for the repley [b]javaxodus[\b]. Unfortenetly that wasn't the problem for two reasons. First it outputs all the numbers of 159 correctly. Second I tested it using -127 as the starting [b]i[\b] position and everything below 0 came out as 63 as well. Thanks for tring.

[gorregisguy]

 

 

Your writing binary data with Readers (which are for character streams).

Use InputStream and OutputStream for writing binary data, use Readers for writing strings.

 

 

http://encyclopedia.laborlawtalk.com/Table_of_Unicode_characters,_128_to_999

Since the first 256 code points of Unicode are based on ISO 8859-1, Unicode characters 128 to 159 are unused characters, corresponding to the upper control character set of ISO 8859-1. Even if characters in the range 128 to 159 display something sensible on your browser, they cannot be relied upon to display the same thing ? or anything at all ? on any other browser, so they should never be used.

Did you look at hello.txt? All 128-159 probably come out as question marks (128 did for me), which is Unicode 63.

 

 

Thanks for the quick replies. I changed the two streams to FileInputStream and FileOutputStream and it worked perfectly. Thanks again.

[gorregisguy]