TCPServer

package tcp_clientserver;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.ServerSocket;
import java.net.Socket;

public class TCPServer
{
    public static void main(String[] args)
    {
        try
        {
            ServerSocket serverSocket = new ServerSocket(1256);
            System.out.println("Waiting for client....");
            Socket connectionSocket = serverSocket.accept();
            BufferedReader inFromClient = new BufferedReader(new InputStreamReader(connectionSocket.getInputStream()));
            String sentenceFromClient = inFromClient.readLine();
            String modifiedSentence = sentenceFromClient.toUpperCase();
            DataOutputStream outToClient = new DataOutputStream(connectionSocket.getOutputStream());
            outToClient.writeBytes(modifiedSentence + '\n');
            serverSocket.close();
        }
        catch (IOException ex)
        {
            System.out.println("Unable to attach " + ex);
        }
    }
}