isLowerCase() method is used to determine whether the specified character is a lowercase letter.
isUpperCase() method is used to determine whether the specified character is an uppercase letter.
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The specific method is as follows:
Character.isLowerCase(c) || Character.isUpperCase(c) // 判断ch是否是字母字符，如'a'，'b‘，是返回true。否则返回false
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