How can I make Cartesian product with Java 8 streams?

Question

I have the following collection type:

Map> map;

I would like to create unique combinations of each o

Answer 1

While it's not a Stream solution, Guava's com.google.common.collect.Sets does that for you

Set> result = Sets.cartesianProduct(Set.of("a1","a2"), Set.of("b1","b2"), Set.of("c1","c2" ))