Ascii codepoints4/17/2023 ![]() In particular, a char (character) is an unsigned two-byte value that contains a UTF-16 value. Java uses UTF-16 internally to represent text. Thus, Surrogates are 16-bit values that indicate symbols that do not fit into a single two-byte value. When you try to use an encoding which uses less bits per character than are needed to represent all possible values (such as UTF-16, which uses 16 bits), you need some workaround. Unicode currently defines 109384 symbols, that's way more than 2 16.įurthermore, ASCII specifies that number sequences are represented one byte per number, while Unicode specifies several possibilities, such as UTF-8, UTF-16, and UTF-32. Two well-known standards for assigning numbers to symbols are ASCII and Unicode. ![]() To represent text in computers, you have to solve two things: first, you have to map symbols to numbers, then, you have to represent a sequence of those numbers with bytes.Ī Code point is a number that identifies a symbol. In another thread about stepping through a string as an array of characters, the specific comment that prompted this question was "Note that this technique gives you characters, not code points, meaning you may get surrogates." I didn't really understand, and rather than create a long series of comments on a 5-year-old question I thought it would be best to ask for clarification in a new question. What are surrogates, and how are they different from characters and code points? Do I have the right definitions for characters and code points? ![]() I've found some information about the differences between characters and code points, characters being what is displayed for human users, and code points being a value encoding that specific character, but I have a no idea about surrogates. I'm trying to find an explanation of the terms "character", "code point" and "surrogate", and while these terms aren't limited to Java, if there are any language-specific differences I'd like the explanation as it relates to Java.
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