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Character Sets
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A character set is a group of textual or graphical symbols that is mapped to a set of (positive) integers called code points. The ASCII (American Standard Code for Information Interchange) character set is commonly used for representing American English. ASCII contains uppercase and lowercase Roman alphabets, European numerals, punctuation, a group of control codes, and some symbols. For example, the ASCII code point for A is 65 (hexadecimal 41).
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9: Internationalization and Localization
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The ISO 8859 character-set series was created because ASCII was not good for supporting languages other than American English. Each ISO 8859 character set can have up to 256 code points. ISO 8859-1, also known as Latin-1, has the ASCII character set, symbols, and characters with accents, circumflexes, and other diacritics. With the ISO 8859 series of character sets, it is possible to represent texts for dozens of languages. Unicode (ISO 10646) defines a standard and universal character set. It was designed to represent practically all character sets in use around the world and can be extended. Unicode encompasses alphabetic scripts and ideographic writing systems, and it may be rendered in any direction. Unicode is an international effort to provide a single character set for everyone. Java uses the Unicode 2.x character-encoding standard. In Unicode, every character uses two bytes. Ranges of character encoding represent various writing systems and other special symbols. For example, Unicode characters in the range 0x9FFF through 0xAC00 represent the Han characters used in Asia: China, Japan, Korea, Taiwan, and Vietnam. Despite the obvious advantages of Unicode, it has a big shortcoming: Unicode support is limited on many platforms because of the lack of fonts capable of displaying all the Unicode characters. The Java programming language internally represents characters and string objects as encoded Unicode. Classes written in the Java programming language can process data in multiple languages, natively performing localized operations such as string comparison, parsing, and collation. Unicode characters in a Java class may be represented as escape sequences, using the notation \uXXXX, where XXXX is the character s 16-bit code point in hexadecimal. These Unicode-escaped strings are useful for Java source files that are not encoded as Unicode. Unicode Transformation Format (UTF), where the U stands for UCS (Universal Character Set), is a multibyte encoding format that stores some characters in one byte and others in two or three bytes. If most of the data is ASCII based, UTF is more compact than Unicode, but in a worst-case scenario, the UTF string can be 50 percent larger than the equivalent Unicode string. Overall, UTF is still fairly efficient and is the most widely used character-encoding scheme.
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Encoding
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An encoding will map the code points in a character set to units of a specific width, and it defines byte serialization and ordering rules. Many of these character sets have more than one encoding. The java.io package contains classes that support the reading and writing of character data streams using a variety of encoding schemes. Some of these classes are discussed later in this chapter, and they all have names that
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List Three Features of the Java Programming Language
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end in either Reader (for example, BufferedReader and InputStreamReader) or Writer (for example, BufferedWriter, PrintWriter, and OutputStreamWriter). Programmers use PrintWriter within JSPs and servlets to produce textual responses, which are automatically encoded. It is possible for servlets to output binary data with no encoding using an OutputStream class. You must explicitly set an encoding if you create an application that uses a character set that cannot be handled by the default encoding (ISO 8859-1, Latin_1). UTF-8 is an 8-bit form of UTF, the unification of US-ASCII and Unicode. UTF-8 is a variable-width character encoding that encodes 16-bit Unicode characters into one or two bytes. Encoding internationalized content in UTF-8 is recommended by Sun because it is compatible with the majority of existing web content and provides access to the Unicode character set. In addition, most current browsers and e-mail clients support it, and it is one of the two required encoding schemes for XML documents (the other being UTF-16).
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