collection framework : operation on two collection object

Question

There are two collections :-

c1 = which include all female employee

c2= all employee whose age greater than 40(age>40).

How can i find all female employee whose age greater than 40?

Does this answer your question? [How to calculate the intersection of two sets?](https://stackoverflow.com/questions/8882097/how-to-calculate-the-intersection-of-two-sets) — Amongalen, Jan 12 '21 at 12:02

score 0 · Answer 1 · answered Jan 12 '21 at 12:03

c1.stream().filter(c2::contains).collect(Collectors.toList());//Last step is optional. Only use it, if you want a list of it.

stream(): Create a stream out of the first collection. (Java 8+)

Then filter() by those that are in c2,too.

And then optionally make a list from it.

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