What is the difference between packetFilter and accept?

Question

What is the difference between these two methods :

processPacket :

PacketListener pListener = new PacketListener() {
        @Override
        public void processPacket(Packet packet) {
            if(packet instanceof Presence) {
               //..
            }
        }
    };

and accept :

PacketFilter pFilter = new PacketFilter() {
        @Override
        public boolean accept(Packet packet) {
            return true;
        }
    };

Aren't they capable of doing the same thing ?

note :

con.addPacketListener(pListener, pFilter);

Answer 1

It seems clear. The PacketFilter filters packets for processing by the PacketListener.