import java.io.*;
import java.net.*;


public class networking {

   private static PrintWriter out;
   private static BufferedReader in;
   private static Socket server;

   public void connect(String host, int port) throws IOException, UnknownHostException {
      try {
         server = new Socket(host, port);
         out = new PrintWriter(server.getOutputStream(), true);
         in = new BufferedReader(new InputStreamReader(server.getInputStream()));
      } catch (UnknownHostException e) {
         System.err.println("Don't know about host: " + host);
      } catch (IOException e) {
         System.err.println("Couldn't get I/O for the connection to: " + host);
        }
   }

   public void disconnect() {
      System.out.println("Disconnecting...");
      try {
         server.close();
         out.close();
         in.close();
         System.out.println("...Disconnected!");
      } catch (IOException e) {
         System.err.println("Derp.");
      } catch (NullPointerException e) {
         System.err.println("Cannot disconnect: Not connected to a server!");
      }
   }

   public void send(String str) throws NullPointerException {
      try {
         out.println(str);
      } catch (NullPointerException e) {
         System.err.println("Cannot send: Not connected to a server!");
      }
   }

   public String read() throws IOException, NullPointerException {
      String a = null;
      try {
         a = in.readLine();
      } catch (NullPointerException e) {
         System.err.println("Cannot read: Pipe is empty!");
      }
      return a;
   }
}