TCPClient.java

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

class TCPClient { 
	public static void main(String argv[]) throws Exception { 
		String sentence; 
		String modifiedSentence; 

		/* Initialize input stream */
		BufferedReader inFromUser = 
			new BufferedReader(new InputStreamReader(System.in)); 

		/* Initialize a client socket, connected to the server */
		Socket clientSocket = new Socket("localhost", 6789); 

		/* Initialize output stream towards the socket */
		DataOutputStream outToServer = 
			new DataOutputStream(clientSocket.getOutputStream()); 

		/* Initialize input stream from the socket */
		BufferedReader inFromServer = 
			new BufferedReader(new
					InputStreamReader(clientSocket.getInputStream())); 

		/* Read an input line */
		sentence = inFromUser.readLine(); 

		/* Send the line to the server*/
		outToServer.writeBytes(sentence + '\n'); 

		/* Read response from the server (string ending with '\n') */
		modifiedSentence = inFromServer.readLine(); 

		System.out.println("FROM SERVER: " + modifiedSentence); 

		clientSocket.close(); 
	}
}