I am reading source of HotSpot sourcode src/share/vm/memory/allocation.hpp
and I see:
// All classes in the virtual machine must be subclassed
> // by one of the following allocation classes:
> //
> // For objects allocated in the resource area (see resourceArea.hpp).
> // - ResourceObj
> //
> // For objects allocated in the C-heap (managed by: free & malloc).
> // - CHeapObj
For my eye, common objects in Java, like
new String();
is a CHeapObj. I looked at an implementation of new operator in that class
and it looks like:
void* CHeapObj::operator new(size_t size){
return (void *) malloc(size);
}
No, I have no idea why it is said: allocation in Java in very fast- it is
fater than C++/C
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