HashMap initialization parameters (load / initialcapacity)

Question

What values should I pass to create an efficient HashMap / HashMap based structures for N items?

In an ArrayList, the efficien

Answer 1

In the guava libraries from Google there is a function that creates a HashMap optimized for a expected number of items: newHashMapWithExpectedSize

from the docs:

Creates a HashMap instance, with a high enough "initial capacity" that it should hold expectedSize elements without growth ...