提供了用于转换数值和字母数据的类。
Classes are available to convert both numeric and character data.
类和接口名以大写字母开头，如Frame。
Class and interface names begin with a capital letter, as in Frame.
对于类和接口名称只对每个单词的第一个字母大写。
Capitalize the first letter of each word that appears in a class or interface name.
类名应该总是以大写字母开头。
类名应该总是以大写字母开头。
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