Objects dynamically created using a new operator are deallocated automatically. The technique that accomplishes this is called garbage collection. It works like this: When no references to an object exist, that object is assumed to be no longer needed, and the memory occupied by the object can be reclaimed.
How Does Automatic Garbage Collection Work?
Automatic garbage collection works by looking at heap memory, identifying which objects are being referenced and which are not, and deleting the unused objects. This is widely known as the "Mark and Sweep Algorithm."