What is the maximum size of the map object in c++ and java?

Question

What is the maximum size of hashmap/map object in c++ and java? I want to use hashmap, but i am working on huge data. I am worrying if i use this on large data, it may crash because of its capacity limit. Is that so? If so, what can be the alternative way?

Answer 1

In Java, the size() of a HashMap is of type int, so there's an upper bound of 2^31-1 elements in the map.

In C++, map::max_size returns the max. number of elements. In a vanilla map, there's an upper bound of at most SIZE_T_MAX elements, which is 2^64-1 on modern hardware.