will the entire program be in the main memory?

[pras]

what will happen when we compile the java program?

/************Doubt**************/
1> will the entire bytecode go into main memory of our computer.
2> what happens in c/c++?

[marc weber]

Compiling a program into class files is one thing. Loading classes to run is another, and the details are likely platform specific.

One thing is certain: This will not be on the SCJP exam (especially the part about C/C++).