Stuff

import java.io.IOException;public interface ClientRef {  public void confirm(int[][] card) throws IOException;  public void deny(String reason) throws IOException;  public void numberCalled(int number) throws IOException;  public void forfeit() throws IOException;  public void win(String winner) throws IOException;}import java.io.IOException;public interface ServerRef{  public void join(ClientRef client,String name,String session) throws IOException;  public void bingo(ClientRef client) throws IOException;}