多选题 Which declaration of the StringBuilder class exists?
  • A. public StringBuilder reverse(String str) {...}
  • B. public StringBuilder reverse(int index, String str) {...}
  • C. public StringBuilder reverse() {...}
  • D. All of the above
【正确答案】 C
【答案解析】StringBuilder类的reverse方法没有任何参数。A、B和D不是正确答案，理由如正确答案的解释。