Why does java.net.DatagramSocket support a "connected" state?

Question

In reference to this question: What is the background that a java.net.DatagramSocket supports a "connected" state?

I would have expected that the isConnected() method always returns false, since UDP/datagram sockets do not support a connected state. But a quick look at the sources shows that there is some logic behind the isConnected() method. Why?

score 3 · Accepted Answer · answered Oct 02 '12 at 06:13

3

Read the Javadoc. When you "connect" a DatagramSocket to a remote IP/port you are just telling the socket not to accept packets to or from any other remote host.

answered Oct 02 '12 at 06:13

Jim Garrison

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So, simply said, this is an extension to the underlying network protocol states, and the connected state of DatagramSocket has nothing to do with network level states, right? – Andreas Fester Oct 02 '12 at 06:19
And also to only send to that remote host:ip. – user207421 Oct 02 '12 at 06:59

Why does java.net.DatagramSocket support a "connected" state?

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