import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.nio.ByteBuffer;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import java.util.Iterator;
import java.util.Set;


public class Client {
    private static SocketChannel client;
    private static ByteBuffer buffer;
  
  	public static void main(String[] args) throws IOException {
  		try {
  			// Connect to the server
            client = SocketChannel.open(new InetSocketAddress("localhost", 5001));
            // Create buffer 
            buffer = ByteBuffer.allocate(256);
        } catch (IOException e) {
            e.printStackTrace();
        }

        buffer = ByteBuffer.wrap("Please send this back to me.".getBytes());
        String response = null;
        try {
            client.write(buffer);
            buffer.clear();
            client.read(buffer);
            response = new String(buffer.array()).trim();
            System.out.println("Server responded with: " + response);
            buffer.clear();
        } catch (IOException e) {
            e.printStackTrace();
        }
  	}

}