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