Character
Character a = new Character(); Character.isUpperCase(a) 判断给点的字符是否是大写字符 Character.isLowerCase(a) 判断给定的字符是否是小写字符 Character.isDigit(a) 判断给定的字符是否是数字字符 Character.toUpperCase(a) 把给定的字符转换成大写字符 Character.to LowerCase(a) 把给定的字符转换成小写字符
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