August 07, 2017
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We can convert a Unicode character to a sequence
of bytes and vice versa using an encoding scheme.
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The java.nio.charset package provides classes to
encode/decode a CharBuffer to a ByteBuffer and vice versa.
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An object of the Charset class represents the
encoding scheme. The CharsetEncoder class performs the encoding. The
CharsetDecoder class performs the decoding.
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We can get an object of the Charset class using
its forName() method by passing the name of the character set as its argument.
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For simple encoding and decoding tasks, we can
use the encode() and decode() methods of the Charset class.
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The following code shows how to encode a
sequence of characters in the string Hello stored in a character buffer and decode
it using the UTF-8 encoding-scheme.
Charset cs = Charset.forName("UTF-8");
CharBuffer cb = CharBuffer.wrap("Hello");
ByteBuffer encodedData = cs.encode(cb);
CharBuffer decodedData = cs.decode(encodedData);
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CharsetEncoder and CharsetDecoder classes accept
a chunk of input to be encoded or decoded.
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The encode() and decode() methods of the Charset
class return the encoded and decoded buffers to us.
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The following code shows how to get encoder and
decoder objects from a Charset object.
Charset cs = Charset.forName("UTF-8");
CharsetEncoder encoder = cs.newEncoder();
CharsetDecoder decoder = cs.newDecoder();
