I don't understand what you mean by "refer the classloaders" and "refer between them". Can you rephrase your question, giving more detail about you're unclear about?
This also has nothing to do with the SCJP exam. But I can't yet tell where it should go. Are you studying for some other exam? Or is this a general question?
"I'm not back." - Bill Harding, Twister
Do the next thing next. That’s a pretty good rule. Read the tiny ad, that’s a pretty good rule, too.
a bit of art, as a gift, that will fit in a stocking