java.nio.charset
Defines charsets, decoders, and encoders, for translating between bytes and Unicode characters.| Class name | Description |
|---|---|
Charset |
A named mapping between characters and bytes |
CharsetDecoder |
Decodes bytes into characters |
CharsetEncoder |
Encodes characters into bytes |
CoderResult |
Describes coder results |
CodingErrorAction |
Describes actions to take when coding errors are detected |
A charset is named mapping between sequences of sixteen-bit Unicode characters and sequences of bytes, in the sense defined in RFC 2278. A decoder is an engine which transforms bytes in a specific charset into characters, and an encoder is an engine which transforms characters into bytes. Encoders and decoders operate on byte and character buffers. They are collectively referred to as coders.
The Charset class defines methods for
creating coders for a given charset and for retrieving the various
names associated with a charset. It also defines static methods
for testing whether a particular charset is supported, for locating
charset instances by name, and for constructing a map that contains
every charset for which support is available in the current Java
virtual machine.
Most users will not use these classes directly; instead they
will use the existing charset-related constructors and methods in
the String class, together with the existing
InputStreamReader and OutputStreamWriter classes, all of whose implementations
have been reworked to make use of the charset facilities defined in
this package. A small number of changes have been made to the
InputStreamReader and OutputStreamWriter classes in order to allow explicit
charset objects to be specified in the construction of instances of
those classes.
Support for new charsets can be made available via the
interface defined in the CharsetProvider class in the java.nio.charset.spi package.
Unless otherwise noted, passing a null argument to a
constructor or method in any class or interface in this package
will cause a NullPointerException to be thrown.
Classes
| Charset | A named mapping between sequences of sixteen-bit Unicode code units and sequences of bytes. |
| CharsetDecoder | An engine that can transform a sequence of bytes in a specific charset into a sequence of sixteen-bit Unicode characters. |
| CharsetEncoder | An engine that can transform a sequence of sixteen-bit Unicode characters into a sequence of bytes in a specific charset. |
| CoderResult | A description of the result state of a coder. |
| CodingErrorAction | A typesafe enumeration for coding-error actions. |
| StandardCharsets |
Constant definitions for the standard Charsets.
|
Exceptions
| CharacterCodingException | Checked exception thrown when a character encoding or decoding error occurs. |
| IllegalCharsetNameException | Unchecked exception thrown when a string that is not a legal charset name is used as such. |
| MalformedInputException | Checked exception thrown when an input byte sequence is not legal for given charset, or an input character sequence is not a legal sixteen-bit Unicode sequence. |
| UnmappableCharacterException | Checked exception thrown when an input character (or byte) sequence is valid but cannot be mapped to an output byte (or character) sequence. |
| UnsupportedCharsetException | Unchecked exception thrown when no support is available for a requested charset. |
Errors
| CoderMalfunctionError |
Error thrown when the decodeLoop method of
a CharsetDecoder, or the encodeLoop method of a CharsetEncoder, throws an unexpected
exception.
|