本文介绍了如何验证字符串是否是有效的java变量?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
如何最好地检查字符串输入是否是用于编码的有效java变量?我敢肯定,我不是第一个愿意这样做的人。但也许我错过了正确的关键字来找到有用的东西。
How can I best check if a string input would be a valid java variable for coding? I'm sure I'm not the first one who is willing to do this. But maybe I'm missing the right keyword to find something useful.
最好的可能是RegEx,它会检查:
Best would probably be a RegEx, which checks that:
-
以字母开头
starts with a letter
然后可以包含数字,字母
can then contain digits, letters
可以包含一些特殊字符,例如'_'(哪个?)
can contain some special characters, like '_' (which?)
推荐答案public static boolean isValidJavaIdentifier(String s) { if (s.isEmpty()) { return false; } if (!Character.isJavaIdentifierStart(s.charAt(0))) { return false; } for (int i = 1; i < s.length(); i++) { if (!Character.isJavaIdentifierPart(s.charAt(i))) { return false; } } return true; }
编辑:并且,如@Joey所示,您还应过滤掉关键字和保留字。
and, as @Joey indicates, you should also filter out keywords and reserved words.
更多推荐
如何验证字符串是否是有效的java变量?
发布评论