Java Heap Allocation Faster than C++

Java Heap Allocation Faster than C++

I already posted this question on SO and it did ok. It was unfortunately
closed though(only needs one vote to reopen) but someone suggested I post
it on here as it is a better fit so the following is literally a copy
paste of the question



I was reading the comments on this answer and I saw this quote.
Object instantiation and object-oriented features are blazing fast to use
(faster than C++ in many cases) because they're designed in from the
beginning. and Collections are fast. Standard Java beats standard C/C++ in
this area, even for most optimized C code.
One user (with really high rep I might add) boldly defended this claim,
stating that
heap allocation in java is better than C++'s
and added this statement defending the collections in java
And Java collections are fast compared to C++ collections due largely to
the different memory subsystem.
So my question is can any of this really be true, and if so why is java's
heap allocation so much faster.