Channel

public interface Channel
implements Closeable

java.nio.channels.Channel

Known indirect subclasses

AbstractInterruptibleChannel, AbstractSelectableChannel, AsynchronousByteChannel, AsynchronousChannel, AsynchronousFileChannel, AsynchronousServerSocketChannel, AsynchronousSocketChannel, ByteChannel, Channel, DatagramChannel, FileChannel, GatheringByteChannel, InterruptibleChannel, MulticastChannel, NetworkChannel, and 10 others.

AbstractInterruptibleChannel	Base implementation class for interruptible channels.
AbstractSelectableChannel	Base implementation class for selectable channels.
AsynchronousByteChannel	An asynchronous channel that can read and write bytes.
AsynchronousChannel	A channel that supports asynchronous I/O operations.
AsynchronousFileChannel	An asynchronous channel for reading, writing, and manipulating a file.
AsynchronousServerSocketChannel	An asynchronous channel for stream-oriented listening sockets.
AsynchronousSocketChannel	An asynchronous channel for stream-oriented connecting sockets.
ByteChannel	A channel that can read and write bytes.
Channel	Instances of this class represent an ISO/IEC 7816-4 channel opened to a Secure Element.
DatagramChannel	A selectable channel for datagram-oriented sockets.
FileChannel	A channel for reading, writing, mapping, and manipulating a file.
GatheringByteChannel	A channel that can write bytes from a sequence of buffers.
InterruptibleChannel	A channel that can be asynchronously closed and interrupted.
MulticastChannel	A network channel that supports Internet Protocol (IP) multicasting.
NetworkChannel	A channel to a network socket.
Pipe.SinkChannel	A channel representing the writable end of a `Pipe`.
Pipe.SourceChannel	A channel representing the readable end of a `Pipe`.
ReadableByteChannel	A channel that can read bytes.
ScatteringByteChannel	A channel that can read bytes into a sequence of buffers.
SeekableByteChannel	A byte channel that maintains a current position and allows the position to be changed.
SelectableChannel	A channel that can be multiplexed via a `Selector`.
SensorDirectChannel	Class representing a sensor direct channel.
ServerSocketChannel	A selectable channel for stream-oriented listening sockets.
SocketChannel	A selectable channel for stream-oriented connecting sockets.
WritableByteChannel	A channel that can write bytes.

A nexus for I/O operations.

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.

Summary

Public methods
`abstract void`	`close()` Closes this channel.
`abstract boolean`	`isOpen()` Tells whether or not this channel is open.

Inherited methods

From interface


        
          java.io.Closeable


      close()

Closes this stream and releases any system resources associated with it.

From interface


        
          java.lang.AutoCloseable


      close()

Closes this resource, relinquishing any underlying resources.

Public methods

close

Added in API level 1

public abstract void close ()

Closes this channel.

After a channel is closed, any further attempt to invoke I/O operations upon it will cause a ClosedChannelException to be thrown.

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.

Throws
`IOException`	If an I/O error occurs

isOpen

Added in API level 1

public abstract boolean isOpen ()

Tells whether or not this channel is open.

Returns
`boolean`	`true` if, and only if, this channel is open