How can TCP/IP identify the correct socket when we bind for 2 different protocols on the same port -

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researching , asking of course here found out did not know/realize before.
process can bind specific port 2 different protocols.
e.g. same port x tcp , udp. (any other well-known examples?)
how possible?
mean if new datagramsocket(6789); , new serversocket(6789);
assume can accept both tcp , udp in program , delegate different classes. right?
how work? java understand if client using tcp or udp , passes socket appropriate class?

ports exist within namespace of protocol. isn't same port, same port number.

java has nothing todo either.


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