double colon :: java 8 how does the following even work

Question

I came across the following code:

List<Fields> invFieldsLst = new ArrayList<>();
InvListener listener = invFieldsLst::add;

The following interface:

public interface InvListener {

  void test(Fields fields);

}

How does the double :: even work? I just dont understand how thats working..

You do know that this is known as a [method reference](https://docs.oracle.com/javase/tutorial/java/javaOO/methodreferences.html), right? — Abra, Feb 27 '19 at 19:03
i undertsand thats a method reference, but how is it being assigned to the interface of a different type... — user1555190, Feb 27 '19 at 19:05
Wouldn't you use `InvListener::test` since the method's name is `test`? — Mr. Polywhirl, Feb 27 '19 at 19:15
got it.. basically its eqv too (i) -> { invFieldsLst.add(i); }; its an impl for that method... — user1555190, Feb 27 '19 at 19:17

score -1 · Answer 1 · answered Feb 27 '19 at 19:17

-1

got it.. basically its eqv too (i) -> { invFieldsLst.add(i); }; its an impl for that method

answered Feb 27 '19 at 19:17

user1555190

1 Answers1