Can someone explain the following behavior in Java sockets:
The general idea is this:
This may be what your code looks like:
Socket socket; PrintWriter pw = new PrintWriter(socket.getOutputStream()); pw.close();
Now, let's have a look at the description of getOutputStream() method of Socket.
public OutputStream getOutputStream() throws IOException Returns an output stream for this socket. If this socket has an associated channel then the resulting output stream delegates all of its operations to the channel. If the channel is in non-blocking mode then the output > stream's write operations will throw an IllegalBlockingModeException.
Closing the returned OutputStream will close the associated socket.
Returns: an output stream for writing bytes to this socket. Throws: IOException - if an I/O error occurs when creating the output stream or if the socket is not connected.
from the description above, we know closing the returned OutputStream will close the associated socket.
Now, when you close the PrintWriter, it'll close the associated OutputStream which will close the associated socket.