How to check if element exists using a lambda expression?

Question

Specifically, I have TabPane, and I would like to know if there is element with specific ID in it.

So, I would like to do this with lambda expression in Java:

<

Answer 1

While the accepted answer is correct, I'll add a more elegant version (in my opinion):

boolean idExists = tabPane.getTabs().stream()
    .map(Tab::getId)
    .anyMatch(idToCheck::equals);

Don't neglect using Stream#map() which allows to flatten the data structure before applying the Predicate.