some puzzles about Openjdk

[Liu lianshun]

Hi,

I've some puzzles from my recent learning about OpenJDK7.0.
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?

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? For examples, When I run HelloWorld, I use the command "java HelloWorld", I want to know how the OpenJDK interpret this command, I think the best way is reading the source codes, but I don't know where to start.

Best regards,
Lianshun Liu
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