如何获得所有字母的集合在Java / Clojure？ [英] How do I get the set of all letters in Java/Clojure?

问题描述

在Python中，我可以这样做：

In Python, I can do this:

>>> import string
>>> string.letters
'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'

有什么办法做类似的Clojure除了复制和粘贴上述字符的地方）？我查看了Clojure标准库和java标准库，但找不到它。

Is there any way to do something similar in Clojure (apart from copying and pasting the above characters somewhere)? I looked through both the Clojure standard library and the java standard library and couldn't find it.

推荐答案

中心实现：

private static String allLetters(String charsetName)
{
    CharsetEncoder ce = Charset.forName(charsetName).newEncoder();
    StringBuilder result = new StringBuilder();
    for(char c=0; c<Character.MAX_VALUE; c++)
    {
        if(ce.canEncode(c) && Character.isLetter(c))
        {
            result.append(c);
        }
    }
    return result.toString();
}

使用US-ASCII调用此函数， （除了大写字母先出现）。你可以用 Charset.defaultCharset（）来调用它，但是我怀疑你在大多数系统上得到的远远大于ASCII字符，即使在美国。

Call this with "US-ASCII" and you'll get the desired result (except that uppercase letters come first). You could call it with Charset.defaultCharset(), but I suspect that you'd get far more than the ASCII letters on most systems, even in the USA.

注意：只考虑基本的多语言飞机。不会太难延伸到辅助飞机，但它需要很长时间，效用是有问题的。

Caveat: only considers the basic multilingual plane. Wouldn't be too hard to extend to the supplementary planes, but it would take a lot longer, and the utility is questionable.

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