多項(xiàng)選擇題

字符串反轉(zhuǎn)的方法錯(cuò)誤的為()

A.publicStringBufferdelete(intstart,intend)
B.publicStringBufferappend(數(shù)據(jù)類型str)
C.publicStringBufferreverse()
D.publicStringsubstring(intstart,intend)

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