Why I am receiving null in my output? - sockets

Question

I want to send a message to my computer from my phone using TCP..My computer is the server and my phone is the client. I am able to send a message from my phone to my computer but in the output, I get null characters ..
I paste my codes below;;
Client ::
public void startApp() {
try {
// establish a socket connection with remote server
streamConnection =
(StreamConnection) Connector.open(connectString);
// create DataOuputStream on top of the socket connection
outputStream = streamConnection.openOutputStream();
dataOutputStream = new DataOutputStream(outputStream);
// send the HTTP request
dataOutputStream.writeChars("Hello");
dataOutputStream.flush();
// create DataInputStream on top of the socket connection
inputStream = streamConnection.openInputStream();
dataInputStream = new DataInputStream(inputStream);
// retrieve the contents of the requested page from Web server
String test="";
int inputChar;
System.out.println("Entering read...........");
while ( (inputChar = dataInputStream.read()) != -1) {
// test=test+((char)inputShar);
results.append((char) inputChar);
}
System.out.println("Leaving read...........");
// display the page contents on the phone screen
//System.out.println(" Result are "+results.toString());
System.out.println(" ");
resultField = new StringItem(null, results.toString());
System.out.println("Client says "+resultField);
resultScreen.append(resultField);
myDisplay.setCurrent(resultScreen);
} catch (IOException e) {
System.err.println("Exception caught:" + e);
} finally {
// free up I/O streams and close the socket connection
try {
if (dataInputStream != null)
dataInputStream.close();
} catch (Exception ignored) {}
try {
if (dataOutputStream != null)
dataOutputStream.close();
} catch (Exception ignored) {}
try {
if (outputStream != null)
outputStream.close();
} catch (Exception ignored) {}
try {
if (inputStream != null)
inputStream.close();
} catch (Exception ignored) {}
try {
if (streamConnection != null)
streamConnection.close();
} catch (Exception ignored) {}
}
}
My server :
public class Main {
/**
* #param args the command line arguments
*/
public static void main(String[] args) {
// TODO code application logic here
try{
ServerSocket sck=new ServerSocket(880);
Socket client=sck.accept();
InputStream inp= client.getInputStream();
int i;
OutputStream out=client.getOutputStream();
out.write("Testing ".getBytes());
System.out.println("Server has responded ");
String str="";
while((i=inp.read())!=-1){
str=str+((char) i);
System.out.println("USer says "+ str);
}
}
catch(Exception e){
System.out.println("Error "+e);
}
}
}
My output for the server ;;
Server has responded
USer says null H
User says null H null
User says null H null e
etc etc
I am not supposed to get this null character,why I am getting it??
Another thing, my server is writing to the stream but the client is not able to receive that,why is that?Do I need to use a separate thread for that?
Thanks in adv

Answer 1

I would guess that isn't your real code, and that your real code initialized str to null.