Скачать или смотреть Java Garbage Collector: Managing Memory in Java

Garbage collection in Java is an automatic process that manages memory by reclaiming the memory occupied by objects that are no longer in use. It helps to free up memory and prevent memory leaks.

example :

Allocation: When you create an object in Java using the new keyword, memory is allocated on the heap to store that object.

Reachability: The garbage collector identifies objects that are no longer reachable or referenced by any active part of the program. This means that if an object cannot be accessed through any chain of references from the root of the object graph (typically starting from the main() method), it is considered unreachable.

Marking: The garbage collector starts from the root objects (such as local variables, static variables, and method parameters) and performs a traversal through the object graph, marking all the reachable objects.

Sweeping: After marking the reachable objects, the garbage collector sweeps through the heap, freeing up the memory occupied by objects that are not marked as reachable. These objects are considered garbage.

Memory Reclamation: Once the garbage collector has identified the garbage objects, it reclaims their memory, making it available for future object allocations.