0728~ sorting out interview questions

say something jvm Garbage collection algorithm ？

Tag clearing algorithm : Mark the object first , And then clear it uniformly , It's called mark removal algorithm ;

Marking algorithm : First, sort the objects by memory address value , Mark the surviving object first , Then sort by memory address value , Clear unmarked ;

Tag copy algorithm : According to the actual memory capacity, it is divided into two spaces of the same size , Use only one at a time , When this is finished , Then copy another surviving object to this one after use , Then clear the used objects ;

say something jvm Garbage collection mechanism ?

Which objects need to be recycled ？ Deprecated constants , There are no referenced objects ;

When to recycle ? When a class is discarded ;

How to recycle ? Use the reference counting method to judge whether the object is alive , Then go to the garbage collector ;

Sort out the script of resume template