Very simple socket client...

SocketClient.java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;

public class SocketClient {

    public static void main(String[] args) throws IOException {

        Socket socket = new Socket("127.0.0.1", 3550);
        PrintWriter output = new PrintWriter(socket.getOutputStream(), true);
        BufferedReader input = new BufferedReader(new InputStreamReader(socket.getInputStream()));
        BufferedReader stdIn = new BufferedReader(new InputStreamReader(System.in));

        String userInput;

        while((userInput = stdIn.readLine()) != null){
            output.println(userInput);
            System.out.println("echo: " + input.readLine());
        }

        output.close();
        input.close();
        stdIn.close();
        socket.close();

    }

}