Recognizing the character as a single, unit as opposed to a sequence of bytes, is a requirement in the case of string manipulations involving multi-byte characters.

将字符看作一个单元而不是一个字节序列，这是进行多字节字符的字符串操作的必要条件。

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The split method is useful because it splits a string into a sequence of smaller strings, using a token character (or any character in a given sequence of characters) as an indicator of where to chop.

split方法很有用，因为它可以将一个字符串分成几个较小的字符串序列，方法是将令牌字符(或给定字符序列中的任何字符)用作断开位置的指示器。

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String.sequence (final) Gets the sequence of character between string and final (both must be 1-character strings) "0".sequence (" 9 ") returns "0123456789".

sequence (final)得到字符串和最终字符串之间的字符序列(字符串和最终字符串都必须是1个字符组成的字符串)“ 0 ” . sequence(“ 9 ”)返回“ 0123456789 ”。

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