PacketDataServer.java and PacketDataClient.java

//PacketDataServer
import java.io.Serializable;
import java.util.ArrayList;

public class PacketDataServer implements Serializable {
    private static final long serialVersionUID = -4593486693931457710L;

    public ArrayList<Player> players;
    public String ip;
    public int port;
    public int maxPlayers;
    public int currentPlayers;
    public short board;

    public PacketDataServer(ArrayList<Player> players, String ip, int port, int maxPlayers, int currentPlayers, short board) {
        this.players = players;
        this.ip = ip;
        this.port = port;
        this.maxPlayers = maxPlayers;
        this.currentPlayers = currentPlayers;
        this.board = board;
    }
}

//PacketDataClient
public class PacketDataClient {
    Player player;

    public PacketDataClient(Player player) {
        this.player = player;
    }
}