자바 소켓프로그래밍

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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));         Socket clientSocket = new Socket("hostname", 6789);         DataOutputStream outToServer = new DataOutputStream(clientSocket.getOutputStream());         BufferedReader inFromServer = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));         sentence = inFromUser.readLine();         outToServer.writeBytes(sentence + '\n');         modifiedSentence = inFromServer.readLine();         System.out.println("FROM SERVER: " + modifiedSentence);         clientSocket.close();     } }

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import java.io.*; import java.net.*; class TCPServer {     public static void main(String argv[]) throws Exception     {         String clientSentence;         String reversedSentence;           ServerSocket welcomeSocket = new ServerSocket(6789);         while(true)         {             Socket connectionSocket = welcomeSocket.accept();             BufferedReader inFromClient = new BufferedReader(new InputStreamReader( connectionSocket . getInputStream()));             DataOutputStream outToClient = new DataOutputStream(connectionSocket.getOutputStream());             clientSentence = inFromClient.readLine();             char[] array = clientSentence.toCharArray();             int len = array.length;                           char[] tosend = new char[len];             for(int i=0; i<len;i++)             tosend[i] = array[len-i];                           reversedSentence = new String(tosend);             outToClient. writeBytes(reversedSentence + '\n');         }      } }