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Tell me where to read about -> I do not understand what it is.

Reported as a duplicate by pavlofff , Alexey Shimansky , Community Spirit 27 May '16 at 6:22 .

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    @Denis oh thank you kind man, for the opportunity to close the millionth question on this topic) - Alexey Shimansky
  • @Sergey has already been the answer to this question. Please use the search ... If it works))) ru.stackoverflow.com/a/491121/191482 - Alexey Shimansky

1 answer 1

this designates the construction of lambda functions that appeared in Java8. There is a lot of material on this topic, for example, I advise you to read here.