What does certain JVM do after loading ByteCode into memory?

[Shuai Wang]

Like HotSpot.. I stopped its complied mode and I was thinking ByteCode of
classes should be in the memory by the
opcode<http://en.wikipedia.org/wiki/Java_bytecode_instruction_listings>
 presents..

But it seems I am wrong.. and some experts told me that there should be
some transformation processes when loading ByteCode into memory..

Could any body give me more instructions about this issue...?

Thank you a lot!