Garbage collection is the process of identifying used and unused objects in heap memory and deleting the unused objects. It involves marking referenced and unreferenced objects, then deleting unreferenced objects using normal deletion or compaction. Generational garbage collection focuses on young, old, and permanent generation objects, allocating to Eden space and copying/promoting referenced objects to older generations as they age over time.

1. Garbage collection
● Garbage collection is the process of looking at heap
memory, identifying which objects are in use and
which are not, and deleting the unused objects.
● An in use object, or a referenced object, means that
some part of your program still maintains a pointer to
that object.
● An unused object, or unreferenced object, is no
longer referenced by any part of your program.

2. Steps involved in garbage collection
● Marking
● Normal deletion
● Deletion with compaction

3. Generational garbage collection
Types of generational garbage collection
● young generation objects
● Old generation objects
● Permanent generation objects

4. Steps involved in Generational
garbage collection
● Object allocation
● Filling the Eden space
● Copying reference object
● Object aging
● Additional aging
● promotion

5. Object allocation

6. Filling eden space

7. Copying reference objects

8. aging

9. Additional aging

10. Promotion

11. Sample code

12. Garbage collection output

13. Any queries?

14. Thank you