java - Java String.getBytes ("UTF-8") 是否保留词典顺序？

Question

如果我有一个按字典顺序排序的 Java 字符串列表 [s1,s2,s3,s4, ...., sn]，然后使用 UTF-8 将每个字符串转换为字节数组encoding bx = sx.getBytes("UTF-8")，字节数组列表[b1,b2,b3,...bn]也是按字典序排序的吗？

Answer 1

是的。根据RFC 3239 :

The byte-value lexicographic sorting order of UTF-8 strings is the same as if ordered by character numbers. Of course this is of limited interest since a sort order based on character numbers is almost never culturally valid.

正如 Ian Roberts 指出的，这适用于“true UTF-8(例如 String.getBytes 会给你)”，但要注意 DataInputStream's fake UTF-8 ，它将在 [U+000001] 之后排序 [U+000000]，在 [U+10FFFF] 之后排序 [U+00F000]。