To access pre-existing names on legacy systems.įrom the entire Unicode character set, which supports most writing
Illegal escape character in string literal java regex code#
Should be used only in mechanically generated source code or, rarely, ( \u0061-\u007a), and, for historical reasons, the The "Java letters" include uppercase and lowercase Method Character.isJavaIdentifierPart(int) returns Letter-or-digit" is a character for which the Method Character.isJavaIdentifierStart(int) returns IdentifierChars but not a Keyword or BooleanLiteral or NullLiteralĪny Unicode character that is a Java letter (see below)Īny Unicode character that is a Java letter-or-digit (see below)
It is the last character in the escaped input stream. SUB character ( \u001a, or control-Z) is ignored if Is no intervening white space or comment.Ĭoncession for compatibility with certain operating systems, the ASCII The tokens are the terminal symbolsĬan serve to separate tokens that, if adjacent, might be tokenized inĪnother manner. The ASCII SUB character, also known as "control-Z"Įlements that are not white space ( §3.6) orĪre tokens. Output format to display Unicode characters when a suitable font is Single u to the corresponding single Unicode
Simultaneously converting each escape sequence with a Unicode characters with one fewer u, while Where multiple u's are present to a sequence of The exact Unicode source can laterīe restored from this ASCII form by converting each escape sequence Transformed version is equally acceptable to a Java compiler and Unicode escapes containing a single u each. Simultaneously converting non-ASCII characters in the source text to
The transformation involves convertingĪny Unicode escapes in the source text of the program to ASCII by In Unicode into ASCII that changes a program into a form that can be Java programming language specifies a standard way of transforming a program written The \u005c is not interpreted as the start of a Z, which is Unicode character 005a, because UTF-16 encoding are the ASCII characters.įor \. ( §3.5) in a program are formed only from ASCIIĬharacters (or Unicode escapes ( §3.3) whichĪSCII (ANSI X3.4) is the American Standard Code for Term character where the representation isĬomments ( §3.7), identifiers, and the contents of Unit where the representation is relevant, and the generic The Java SE platform provides methods to convertīetween 16-bit and 32-bit representations. Some APIs of the Java SE platform, primarily in theĬharacter class, use 32-bit integers to represent code points as Programming language represents text in sequences of 16-bit code Range U+0000 to U+FFFF, the values of code points and UTF-16 code The low-surrogates range (U+DC00 to U+DFFF). In this encoding, supplementaryĬharacters are represented as pairs of 16-bit code units, the firstįrom the high-surrogates range, (U+D800 to U+DBFF), the second from Range of characters using only 16-bit units, the Unicode standardĭefines an encoding called UTF-16. U+FFFF are called supplementary characters. Characters whose code points are greater than U+0000 to U+10FFFF, using the hexadecimal U+n Since been changed to allow for characters whose representation Originally designed as a fixed-width 16-bit character encoding. SE 1.4 (to Unicode 3.0), and Java SE 5.0 (to Unicode 4.0). Occurred in JDK 1.1 (to Unicode 2.0), JDK 1.1.7 (to Unicode 2.1), Java Upgrades to newer versions of the Unicode Standard Versions of the Java programming language prior to 1.1 used Unicode Used by a given release is specified in the documentation of the class Information about thisĬharacter set and its associated character encodings may be found at ( §3.4) to support the different conventions ofĮxisting host systems while maintaining consistent lineįrom the lexical translations are reduced to a sequence of input ( §3.3) can be used to include any UnicodeĬharacter using only ASCII characters. ( §3.1), but lexical translations are provided Lexical structure of the Java programming language. Escape Sequences for Character and String Literals 3.10.7.
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