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.
#Java string to codepoints code#
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.
0 kommentar(er)
