question: public final boolean at ( String str , CharSequence csq ) { int i = index ; int length = csq . length ( ) ; for ( int j = 0 ; j < str . length ( ) ; ) { if ( ( i >= length ) || ( str . charAt ( j ++ ) != csq . charAt ( i ++ ) ) ) return false ; } return true ; }
target:  Indicates if this cursor points to the specified characters in the specified sequence.