看看Character类的方法吧!static boolean isDigit(char ch)
Determines if the specified character is a digit. static boolean isLetter(char ch)
Determines if the specified character is a letter. static boolean isLetterOrDigit(char ch)
Determines if the specified character is a letter or digit. static boolean isWhitespace(char ch)
Determines if the specified character is white space according to Java.
Determines if the specified character is a digit. static boolean isLetter(char ch)
Determines if the specified character is a letter. static boolean isLetterOrDigit(char ch)
Determines if the specified character is a letter or digit. static boolean isWhitespace(char ch)
Determines if the specified character is white space according to Java.
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