//**** Reverse client and palindrome detector (see last lecture examples)
import java.net.Socket;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.InputStreamReader;
import java.io.BufferedReader;
public class ReverseClient {
    public static void main(String[ ] args) {
        // Must be invoked with server's IP address.
        if (args.length < 1) {
            System.err.println("Usage: ReverseClient <IP address>");
            return;
        }
        try {
            // Open a socket to the server.
            Socket sock = new Socket(args[0], port);
            // Print and send the request string.
            String req = "This is the way the world ends";
            System.out.println("Sent:     " + req);
            PrintWriter out = 
              new PrintWriter(sock.getOutputStream());
            out.println(req);
            out.flush();
            // Read and print the response string.
            InputStreamReader isr = 
              new InputStreamReader(sock.getInputStream());
            BufferedReader in = new BufferedReader(isr);
            String res = in.readLine();   // blocks
            System.out.println("Received: " + res);
            // Cleanup.
            sock.close();
            // Expensive, socket-based palindrome checker.
            if (req.equals(res))
                System.out.println("A palindrome!");
            else
                System.out.println("Not a palindrome!");
        }
        catch(IOException e) { System.err.println(e); }
    }
    private static final int port = 3333;
}