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See:
Description
| Interface Summary | |
|---|---|
| BufferPoolMXBean | The management interface for a buffer pool. |
| Class Summary | |
|---|---|
| Buffer | A container for data of a specific primitive type. |
| ByteOrder | A typesafe enumeration for byte orders. |
| MappedByteBuffer | A direct byte buffer whose content is a memory-mapped region of a file. |
Defines buffers, which are containers for data, and provides an overview of the other NIO packages.
The central abstractions of the NIO APIs are:
Buffers, which are containers for data;
Charsets and their
associated decoders and encoders,
which translate between
bytes and Unicode characters;
Channels of
various types, which represent connections
to entities capable of
performing I/O operations; and
Selectors and selection keys, which together with
selectable channels define a multiplexed, non-blocking
I/O facility.
The java.nio package defines the buffer classes, which are used
throughout the NIO APIs. The charset API is defined in the Buffers Description A buffer is a container for a fixed amount of data of a specific
primitive type. In addition to its content a buffer has a position,
which is the index of the next element to be read or written, and a
limit, which is the index of the first element that should not be read
or written. The base There is a buffer class for each non-boolean primitive type. Each class
defines a family of get and put methods for moving data out of
and in to a buffer, methods for compacting, duplicating, and
slicing a buffer, and static methods for allocating a new buffer
as well as for wrapping an existing array into a buffer.
Byte buffers are distinguished in that they can be used as the sources and
targets of I/O operations. They also support several features not found in the
other buffer classes:
A byte buffer can be allocated as a
direct buffer, in which case the Java virtual machine will make a
best effort to perform native I/O operations directly upon it. A byte buffer can be created by A byte buffer provides access to its content as either a heterogeneous
or homogeneous sequence of binary data
of any non-boolean primitive type, in either big-endian or little-endian byte order. Unless otherwise noted, passing a null argument to a constructor
or method in any class or interface in this package will cause a
java.nio.charset package, and the channel and selector APIs are defined in the
java.nio.channels package. Each of these subpackages has its own
service-provider (SPI) subpackage, the contents of which can be used to extend
the platform's default implementations or to construct alternative
implementations.
BufferPosition, limit, and capacity;
clear, flip, rewind, and mark/reset
ByteBufferGet/put, compact, views; allocate, wrap
MappedByteBuffer A byte buffer mapped to a file
CharBufferGet/put, compact; allocate, wrap
DoubleBuffer ' '
FloatBuffer ' '
IntBuffer ' '
LongBuffer ' '
ShortBuffer ' ' ByteOrderTypesafe enumeration for byte orders Buffer class defines these properties as
well as methods for clearing, flipping, and rewinding, for
marking the current position, and for resetting the position to
the previous mark.
mapping a region of a
file directly into memory, in which case a few additional file-related
operations defined in the MappedByteBuffer class are
available. NullPointerException to be thrown.
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