How to know port assigned to DatagramSocket by OS

Question

I can initialize a DatagramSocket with a zero arg constructor, and the OS will choose the port number for the socket

DatagramSocket socket = new DatagramSocket();

But when I call getPort() on the socket, the result returned is -1

So I'm just wondering, is it even possible to know the port number assigned to the socket by the OS?

Answer 1

You can get it via getLocalPort() .

Rather a trivial question.