Liu lianshun wrote: > Firstly, I want to know that whether I can change the java programes' > behavior via changing some source files in OpenJDK, for examples, > execute the following codes will print "100". > int i=100; > System.out.println(i); > My question is that how to print "200", without changing the source > codes. Is it possible?
Is it possible to change behavior of programs by changing the source code of OpenJDK? Yes. You can make them all crash very fast by doing something bad in the VM for example. ;) Is it possible to change behavior of programs without changing the source code of OpenJDK? Yes, check out aspect oriented programming using, for example, AspectJ. > Secondly, the number of files in the OpenJDK project is very large, I > want to know how these files are structured. Besides, how can I debug > the project? Volker Simonis wrote a couple of blog entries on how to get started hacking on the VM, starting with: http://weblogs.java.net/blog/simonis/archive/2008/01/hotspot_develop.html have fun! dalibor topic -- ******************************************************************* Dalibor Topic Tel: (+49 40) 23 646 738 Java F/OSS Ambassador AIM: robiladonaim Sun Microsystems GmbH Mobile: (+49 177) 2664 192 Nagelsweg 55 http://openjdk.java.net D-20097 Hamburg mailto:dalibor.to...@sun.com Sitz der Gesellschaft: Sonnenallee 1, D-85551 Kirchheim-Heimstetten Amtsgericht München: HRB 161028 Geschäftsführer: Thomas Schröder, Wolfgang Engels, Dr. Roland Bömer Vorsitzender des Aufsichtsrates: Martin Häring
