public class Packet
{
    public Packet (int address, long x, long y)
    {
        _address = address;
        _x = x;
        _y = y;
    }

    public final int getAddress ()
    {
        return _address;
    }

    private final long getX ()
    {
        return _x;
    }

    private final long getY ()
    {
        return _y;
    }

    private int _address;
    private long _x;
    private long _y;
}
@@ -15,16 +15,68 @@
 acket%0A%7B%0A
+    public static final int EMPTY_PACKET = -1;%0A    %0A
     publ

Update Packet.java