![]() ![]() Conformance with this requirement typically requires using methods that accept a Unicode code point as an int value and avoiding methods that accept a Unicode code unit as a char value because these latter methods cannot support supplementary characters. In particular, do not write code that assumes that a value of the primitive type char (or a Character object) fully represents a Unicode code point. Because the UTF-16 representation is also used in char arrays and in the String and StringBuffer classes, care must be taken when manipulating string data in Java. characters and a Unicode code point very complex: combining characters. Don't form strings containing partial characters from variable-width encodings), UTF-16 is a variable-width encoding. This involves that MS-Windows, Java, ICU, python stop using it as their favorite. The lower (least significant) 21 bits of int are used to represent Unicode code points, and the upper (most significant) 11 bits must be zero. An int value represents all Unicode code points, including supplementary code points. Determines if the character (Unicode code point) may be part of a Java. In this representation, supplementary characters are represented as a pair of char values, the first from the high-surrogates range, (\uD800-\uDBFF), the second from the low-surrogates range (\uDC00-\uDFFF).Ī char value, therefore, represents BMP code points, including the surrogate code points, or code units of the UTF-16 encoding. Indicates whether the specified code point is a lower case letter. The Java platform uses the UTF-16 representation in char arrays and in the String and StringBuffer classes. The very reason it exists is because some time ago there used to be a misguided belief that widechar is going to be what UCS-4 now is. Opinion: Yes, UTF-16 should be considered harmful. See UTF-8 Everywhere for the latest updates. According to the Java API class Character documentation (Unicode Character Representations): 20 Answers Sorted by: 339 votes This is an old answer. To support supplementary characters without changing the char primitive data type and causing incompatibility with previous Java programs, supplementary characters are defined by a pair of Unicode code units called surrogates. ![]() Such characters are generally rare, but some are used, for example, as part of Chinese and Japanese personal names. The set of characters from U 0000 to U FFFF is called the basic multilingual plane (BMP), and characters whose code points are greater than U FFFF are called supplementary characters. The range of Unicode code points is now U 0000 to U 10FFFF. The Unicode Standard has since been changed to allow for characters whose representation requires more than 16 bits. The char data type is based on the original Unicode specification, which defined characters as fixed-width 16-bit entities. ![]()
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