retainAll method

Removes all elements of this set that are not elements in [elements].

void retainAll(
Iterable<Object> elements
)

Removes all elements of this set that are not elements in [elements].

Checks for each element of [elements] whether there is an element in this set that is equal to it (according to this.contains), and if so, the equal element in this set is retained, and elements that are not equal to any element in elements are removed.