这里用到的都是java里的逻辑运算符,!是逻辑“非”运算,&&是逻辑“与”运算,||是逻辑“或”运算.!的作用是对后面括号里的结果进行否定（例如!(>=)就等价于
英语翻译if (s.charAt(i) >= '0' && s.charAt(i)
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