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kotlinlang

Can someone explain such thing: in Java code there is an interface `Completer` that has only one method (function) `public abstract int complete(arg1, arg2, arg3)`, so when a variable `completer: Completer?` is assigned, it's done via Java lambda
```
completer = (arg1, arg2, arg3) -&gt; { ... }
```
Instead of creating (at least) anonymous object of type `Completer` and `override`-ing the `complete` method. Is it possible to do something like that in Kotlin, or I have to do
```
object: Completer {
  override fun complete(arg1, arg2, arg3) { ... }
}
```
Why I can't do it with lambda -- because the compiler complains that `completer` must be of type `Completer?`, not `(???, ???, ???) -&gt; Unit`

You can write
```val c = Completer { arg1, arg2, arg3 -&gt; ... }```

Thanks :+1: Too many things that I do not know yet...