A simple networking program, I can't figure out what's gone wrong

Question

hi, dear all, I programmed a simple server and client, I try to type some in client and see it on the server side, but the server doesn't show the input from client. Please help me out, thanks a lot.
there are two classes, server and client.
server class:
import java.net.*;
import java.io.*;
public class test3 {
/** Creates a new instance of test3 */
public test3() {
public static void main(String[] args) {
try {
ServerSocket server = new ServerSocket(5555);
while (true) {
Socket connection = server.accept( );
try{
// OutputStreamWriter out
// = new OutputStreamWriter(connection.getOutputStream( ));
// out.write("You've connected to this server.\r\n");
// out.flush();
InputStream in = connection.getInputStream( );
StringBuffer input = new StringBuffer( );
int c;
// connection.close( );
int i = 0;
while(i < 10){
while ((c = in.read( )) != -1) input.append((char) c);
String inString = input.toString().trim( );
System.out.println(inString);
i++;
catch (IOException e) {
// This tends to be a transitory error for this one connection;
// e.g. the client broke the connection early. Consequently,
// we don't want to break the loop or print an error message.
// However, you might choose to log this exception in an error log.
/* finally {
// Most servers will want to guarantee that sockets are closed
// when complete.
try {
if (connection != null) connection.close( );
catch (IOException e) {}
catch (IOException e) {
System.err.println(e);
client class:
import java.net.*;
import java.io.*;
public class test4{
public static void main(String[] args){
try{
Socket theSocket = new Socket("192.168.1.102", 5555);
OutputStream theOutputStream = theSocket.getOutputStream();
OutputStreamWriter out = new OutputStreamWriter(theOutputStream);
BufferedReader userIn = new BufferedReader(new InputStreamReader(System.in));
while (true) {
String theLine = userIn.readLine( );
if (theLine.equals(".")) break;
System.out.println(theLine);
out.write(theLine + "\r\n");
out.flush( );
// System.out.println(networkIn.readLine( ));
}// end of while
}// end of try
catch (IOException e) {
System.err.println(e);
}// end of catch
} // end of main
} // end of test4
Thanks again

Answer 1

Well, i don't get the error to, but I use the DataOutputStream and DataInputStream or ObjectOutputStream and ObjectInputStream with the I/O connection.
the basic steps at the server are:
1) create new ServerSocket
2) Waiting for a connection
3) Create a I/O Stream
4) Process the job
5) close the connection
at the client are:
1) connect to the server
2) Create a I/o stream
3) process the job
4) close the connection
Maybe you can send what the specify error you get in your code