TCPServerjava

import java.io.*;
import java.net.*;

class TCPServer{
    public static void main(String argv[]) throws Exception{
        ServerSocket welcomeSocket = new ServerSocket(6789);
        while (true){
            Socket connectionSocket = welcomeSocket.accept();
            BufferedReader inFromClient = new BufferedReader(
                    new InputStreamReader(connectionSocket.getInputStream()));
            PrintStream outToClient = new PrintStream(
                    connectionSocket.getOutputStream());
            String clientSentence = inFromClient.readLine();
            System.out.println("FROM CLIENT: " + clientSentence);
            String capitalizedSentence = clientSentence.toUpperCase();
            outToClient.println(capitalizedSentence);
        }
    }
}