question: private int read ( int n ) throws IOException { if ( closed ) { return 0 ; } char [ ] c = new char [ n ] ; int count = 0 ; int read = 0 ; do { read = reader . read ( c ) ; if ( read < 0 ) { closed = true ; break ; } count += read ; buff . append ( c , 0 , read ) ; } while ( count < n ) ; return count ; }
target:  Reads n characters from the stream and appends them to the buffer 