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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(); } }