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The One Class Server
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    EchoServer.java
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import java.io.*;
import java.io.*;

public class EchoServer extends Server
{
// A single argument: the port on which to listen
public EchoServer( int port ) {
 super( port );
}

// This function is called for each new connection; it
// implements whatever functionality is needed from the server.
// In this case, it simply sends back to the client all data
// that the client sends it. If it receives a 'q', the
// whole server is shut down.

public void process( InputStream in, OutputStream out ) {
 try {
  while (true) {
   int c = in.read();
   if (c=='q') {
    close();
   } else {
        out.write( c );
   }
  }
 } catch( IOException ie ) { System.out.println( ie ); }
}

// Command-line: "java EchoServer <port>"
static public void main( String args[] ) throws Exception {
 int port = new Integer( args[0] ).intValue();
 new EchoServer( port );
}
}