# Java8 Double colon operator

## 형태

`Reference::method`

## 설명

* 특정 메소드를 호출하는 람다식을 간략화한 연산자
* 패러미터와 반환 여부, 반환 타입에 따라 `@FunctionalInterface` 중 하나와 대응됨

## 유의점

* 패러미터가 없고, 반환 값이 있을 때 Double colon operator은 `Supplier`, `Callable` 두 가지 모두에 대응됨


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