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java netwrok program—tcp

I use socket in this program.
TCPServer.java:

import java.io.*;
import java.net.*;
import java.lang.*;
import java.util.*;
class TCPServer
{
   public static void main(String argv[]) throws Exception
      {
         String clientSentence;
         String capitalizedSentence;
         ServerSocket welcomeSocket = new ServerSocket(2345);
         while(true)
         {
            System.out.println(" Server is waitting.........\n");
            Socket connectionSocket = welcomeSocket.accept();
            BufferedReader inFromClient = new BufferedReader(new InputStreamReader(connectionSocket.getInputStream()));
            DataOutputStream outToClient = new DataOutputStream(connectionSocket.getOutputStream());
            clientSentence = inFromClient.readLine();
            Date transfer_date = new Date();
            System.out.println("Received: " + clientSentence + "---" + transfer_date.toString());   //receive data from client
            capitalizedSentence = clientSentence.toUpperCase() + '\n';
            outToClient.writeBytes(capitalizedSentence);   //send data to client
         }
      }
}

TCPClient.java:

import java.io.*;
import java.net.*;
class TCPClient
{
 public static void main(String argv[]) throws Exception
 {
  String sentence;
  String modifiedSentence;
  BufferedReader inFromUser = new BufferedReader( new InputStreamReader(System.in));   //get input from keyboard
  Socket clientSocket = new Socket("localhost", 2345);
  DataOutputStream outToServer = new DataOutputStream(clientSocket.getOutputStream());
  BufferedReader inFromServer = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
  sentence = inFromUser.readLine();
  outToServer.writeBytes(sentence + '\n');   //send data to server
  modifiedSentence = inFromServer.readLine();
  System.out.println("FROM SERVER: " + modifiedSentence);   //get data from server
  clientSocket.close();
 }
}

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