How does the memory separation mechanism work in the JVM in the context of object lifecycle management?

In JVM, memory for objects is divided into several regions, the main ones being Heap and Stack. Objects are created in the heap, and references to them are stored in the stack.

The heap is divided into generations: Young Generation, Old Generation, and sometimes Permanent Generation (for class metadata, replaced by Metaspace in newer versions).

The lifecycle of objects is managed by the garbage collector:

• New objects are created in the Young Generation.
• If an object survives several garbage collection cycles, it is moved to the Old Generation.
• Objects with no references are considered garbage and are removed.

This division allows efficient memory management, quickly freeing recently created objects and less frequently handling long-lived ones.

An example simplified diagram:

Stack: stores references to objects
Heap:
  Young Generation: new objects
  Old Generation: long-lived objects