Channel

implements Closeable

java.nio.channels.Channel

Known Indirect Subclasses

AbstractInterruptibleChannel, AbstractSelectableChannel, ByteChannel, DatagramChannel, FileChannel, GatheringByteChannel, InterruptibleChannel, Pipe.SinkChannel, Pipe.SourceChannel, ReadableByteChannel, ScatteringByteChannel, SelectableChannel, ServerSocketChannel, SocketChannel, WritableByteChannel

AbstractInterruptibleChannel	`AbstractInterruptibleChannel` is the root class for interruptible channels.
AbstractSelectableChannel	`AbstractSelectableChannel` is the base implementation class for selectable channels.
ByteChannel	A ByteChannel is both readable and writable.
DatagramChannel	A `DatagramChannel` is a selectable channel that represents a partial abstraction of a datagram socket.
FileChannel	An abstract channel type for interaction with a platform file.
GatheringByteChannel	The interface for channels that can write a set of buffers in a single operation.
InterruptibleChannel	Channels that implement this interface can be asynchronously closed and interrupted.
Pipe.SinkChannel	Writable sink channel used to write to a pipe.
Pipe.SourceChannel	Readable source channel used to read from a pipe.
ReadableByteChannel	A `ReadableByteChannel` is a type of `Channel` that can read bytes.
ScatteringByteChannel	The interface for channels that can read data into a set of buffers in a single operation.
SelectableChannel	A channel that can be used with a `Selector`.
ServerSocketChannel	A `ServerSocketChannel` is a partial abstraction of a selectable, stream-oriented listening socket.
SocketChannel	A `SocketChannel` is a selectable channel that provides a partial abstraction of stream connecting socket.
WritableByteChannel	A `WritableByteChannel` is a type of `Channel` that can write bytes.

Class Overview

A channel is a conduit to I/O services covering such items as files, sockets, hardware devices, I/O ports or some software component.

Channels are open upon creation, and can be closed explicitly. Once a channel is closed it cannot be re-opened, and any attempts to perform I/O operations on the closed channel result in a ClosedChannelException.

Particular implementations or sub-interfaces of Channel dictate whether they are thread-safe or not.

Summary

Public Methods
abstract void	close() Closes an open channel.
abstract boolean	isOpen() Returns whether this channel is open or not.

[Expand]

Inherited Methods

From interface java.io.Closeable

Public Methods

public abstract void close ()

Since: API Level 1

Closes an open channel. If the channel is already closed then this method has no effect. If there is a problem with closing the channel then the method throws an IOException and the exception contains reasons for the failure.

If an attempt is made to perform an operation on a closed channel then a ClosedChannelException will be thrown on that attempt.

If multiple threads attempt to simultaneously close a channel, then only one thread will run the closure code, and others will be blocked until the first returns.

Throws

IOException	if a problem occurs closing the channel.

public abstract boolean isOpen ()

Since: API Level 1

Returns whether this channel is open or not.

Returns

true if the channel is open, otherwise returns false.

Interfaces

Classes

Exceptions