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【简答题】
写出下列字符操作的方法声明(例如,返回字符串长度:int length();)。 (1)去除字符串两端的空格: (2)将字符串转换为字符数组: (3)将原字符串使用给定的分隔符(String regex)分隔为字符串数组: (4)判断字符串是否为空: (5)返回指定子字符串(String str)在字符串中最后一次出现的位置: (6)截取的字符串,从指定位置(int beginIndex)到字符串末尾:
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