How to flush a SocketChannel in Java NIO?

Question

In Java IO, an OutputStream can use flush() method to make sure data is sent at once.

Is there a corresponding function in Java NIO for SocketChannel? As far as I know, there is a force() method for FileChannel to flush data.

Might be a very naive question...

Answer 1

Use either .force() or .getFD.sync()

Update: Since you updated your question to be more specific on a SocketChannel (it was generally NIO), please see my reply instead.