Implementing: java.nio.channels.Channel

Closes this channel.

If the channel has already been closed then this method returns immediately. Otherwise it marks the channel as closed and then invokes the implCloseChannel method in order to complete the close operation.

Exceptions:

IOException

If an I/O error occurs

Implementing: java.nio.channels.Channel

Tells whether or not this channel is open.

Returns:  true if, and only if, this channel is open