A channel represents an open connection to an entity such as a hardware device, a file, a network socket, or a program component that is capable of performing one or more distinct I/O operations, for example reading or writing.
A channel is either open or closed. A channel is open upon creation,
and once closed it remains closed. Once a channel is closed, any attempt to
invoke an I/O operation upon it will cause a ClosedChannelException
to be thrown. Whether or not a channel is open may be tested by invoking
its isOpen method.
Channels are, in general, intended to be safe for multithreaded access as described in the specifications of the interfaces and classes that extend and implement this interface.
| Modifier and Type | Method and Description |
|---|---|
| public void | |
| public boolean | Returns: true if, and only if, this channel is openTells whether or not this channel is open. |
| close | back to summary |
|---|---|
| public void close() throws IOException Redeclares java. Closes this channel. After a channel is closed, any further attempt to invoke I/O
operations upon it will cause a If this channel is already closed then invoking this method has no effect. This method may be invoked at any time. If some other thread has already invoked it, however, then another invocation will block until the first invocation is complete, after which it will return without effect.
| |
| isOpen | back to summary |
|---|---|
| public boolean isOpen() Tells whether or not this channel is open.
| |
