package bingo.game;import java.net.*;import bingo.shared.*;class SocketGate implements Constants {    private InetAddress ballListeningGroup;    private InetAddress playerListeningGroup;    private InetAddress gameListeningGroup;    private MulticastSocket socket = null;    SocketGate () throws java.io.IOException {        socket = new MulticastSocket(Constants.portNumber);        ballListeningGroup = InetAddress.getByName(Constants.BallListeningGroup);        playerListeningGroup = InetAddress.getByName(Constants.PlayerListeningGroup);        gameListeningGroup = InetAddress.getByName(Constants.GameListeningGroup);    }    void sendBall(BingoBall b) {        sendBytes(b.getBytes(), ballListeningGroup);    }    void sendPlayerStatusMessage(PlayerRecord p) {        sendBytes(p.getBytes(), playerListeningGroup);    }    void sendGameStatusMessage(String msg) {        sendBytes(msg.getBytes(), gameListeningGroup);    }    private void sendBytes(byte[] data, InetAddress group) {        DatagramPacket packet = new DatagramPacket(data, data.length, group,                                                   Constants.portNumber);        try {            socket.send(packet);        } catch (java.io.IOException e) {            // PENDING: what should go in here?        }    }}