question: public static byte [ ] fetchClass ( String host , int port , String directory , String classname ) throws IOException { byte [ ] b ; URLConnection con = fetchClass0 ( host , port , directory + classname . replace ( '.' , '/' ) + ".class" ) ; int size = con . getContentLength ( ) ; InputStream s = con . getInputStream ( ) ; try { if ( size <= 0 ) b = ClassPoolTail . readStream ( s ) ; else { b = new byte [ size ] ; int len = 0 ; do { int n = s . read ( b , len , size - len ) ; if ( n < 0 ) throw new IOException ( "the stream was closed: " + classname ) ; len += n ; } while ( len < size ) ; } } finally { s . close ( ) ; } return b ; }
target:  Reads a class file on an http server.