在什么编码是Java字符存储在？ [英] In what encoding is a Java char stored in?

问题描述

是否保证Java字符类型存储在任何特定的编码中？

Is the Java char type guaranteed to be stored in any particular encoding?

编辑：我错误地写了这个问题。

I phrased this question incorrectly. What I meant to ask is are char literals guaranteed to use any particular encoding?

推荐答案

存储的字符串在哪里？ Java中的所有字符串均为，以UTF-16表示。

"Stored" where? All Strings in Java are represented in UTF-16. When written to a file, sent across a network, or whatever else, it's sent using whatever character encoding you specify.

编辑：具体用于以下操作： char 类型，请参阅字符文档。具体来说：字符数据类型...基于原始的Unicode规范，它将字符定义为固定宽度的16位实体。因此，将 char 转换为 int 将为您提供一个UTF-16值 char 实际上包含该字符集的一个字符。如果你只是将一些随机值插入到 char 中，它显然不一定是一个有效的UTF-16字符，同样，如果你使用错误的编码读取字符。文档继续讨论如何补充的UTF-16字符只能由 int 表示，因为 char 没有足够的空间来容纳它们，如果你在这个级别上操作，熟悉这些语义可能很重要。

Specifically for the char type, see the Character docs. Specifically: "The char data type ... are based on the original Unicode specification, which defined characters as fixed-width 16-bit entities." Therefore, casting char to int will always give you a UTF-16 value if the char actually contains a character from that charset. If you just poked some random value into the char, it obviously won't necessarily be a valid UTF-16 character, and likewise if you read the character in using a bad encoding. The docs go on to discuss how the supplementary UTF-16 characters can only be represented by an int, since char doesn't have enough space to hold them, and if you're operating at this level, it might be important to get familiar with those semantics.

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