Problem with ASCII char (127-'\u0080') while printing

Question

Hello,
I am working with socket and want to send some data over the network. I am using Strings for sending data over the socket. In few characters ('\u007F' to '\u009F') I am getting error. Whenever I try to execute this line, I got an error
System.out.println ( '\u0080') -> It is printed as '?' = '\u003F'.
I try to send this character (String) over the network through Client Socket\
Socket ClientSocket = new Socket("192.168.243.10", "6010");out = new PrintWriter(ClientSocket.getOutputStream(), true);
out.println('\u0080') ;
out.close() ;
ClientSocket.close();It is received with same '\u003F' ='?' at the receiving end (192.168.243.10). While rest all characterset is receiving & printing accurately. Any Comments on it?
Shozi

Answer 1

You are using a Writer to send those chars, which
means it will attempt to encode them into bytes. But
since those bytes you mentioned are not defined in
ASCII (or in UTF-8859-1 for that matter) then the
charset converter encodes them as "?".
Can you explain why you are using Strings when it
appears you need to send untranslated bytes?I am following a pattern of bits to identify data elements present in message string.
I am writing a chat Client & Server. While sending message to chat clients, I need to tell whether private window request, or main channel request or notification (will display in both private window & main window). In this way, I have 32 combination of options that can be present in my message, so I am using 4 chars (32 bits) to figure out which option is present or which message element is present in the received message. So, I am using bitmap pattern to identify data elements in my message. For this I am using bits of a char (lower 8 bits). This will help me in identifying the characters present in the message. I have specific range of characters that aren't interpreted correctly. '\u007F' to '\u009F' while rest are working absolutely fine with me. Why these characters aren't working? This is what I am trying to figure out.
Hope I clarifies the situation.