All the objects which are created dynamically (using new in C++ and Java) are allocated memory in the heap. If we go on creating objects we might get Out Of Memory error, since it is not possible to allocate heap memory to objects. So we need to clear heap memory by releasing memory for all those objects which are no longer referenced by the program (or the unreachable objects) so that the space is made available for subsequent new objects. This memory can be released by the programmer itself but it seems to be an overhead for the programmer, here garbage collection comes to our rescue, and it automatically releases the heap memory for all the unreferenced objects .
#include<iostream>
class A {
int x;
public:
A() { x = 0; ++x; }
};
int main() {
for (int i = 0; i < 1000000000; ++i) {
A *a = new A();
delete a;
}
std::cout << "DING!" << std::endl;
}
Length=10