Mahozad :
What is the simplest way to make a union or an intersection of Sets in java? I've seen some strange solutions to this simple problem (e.g. manually iterating the two sets).
Mahozad :
The simplest one-line solution is this:
set1.addAll(set2); // Union
set1.retainAll(set2); // Intersection
The above solution is destructive meaning that contents of the original set1 my change. If you don't want to touch your existing sets, create a new set:
Set<E> result = new HashSet<>(set1);
// └─ your specific type
result.addAll(set2); // Union
result.retainAll(set2); // Intersection
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