Can someone help me with my query?

I have an custom object defined with a list of strings in it. These string are id's of a different type

I have a list of strings of those id's with which I want to check equality against.

public class Foo {
@CollectionOfElements(targetElement = String.class)
private List<String> bar;
}

I want to be able to give a list<String> to methode List<Foo> findGebruiksBesluiten(final List<String> beer);
I want to know, if any of the String in beer are in bar;

Does anyone no if this is possible? And if so, how?

No one with any Idea?!