<Implementing interfaces in Korlin> could anyone e...

# stackoverflow

[user]

Implementing interfaces in Korlin
could anyone explain to me the syntax of this interface implementation?
Why I need to use the sign '=' to implement CommandLineRunner. When I use sign ':'(accord to basic syntax http://kotlinlang.org/docs/reference/interfaces.html) compiler requires a return statement.

@SpringBootApplication
class Application{

@Bean
fun imageProcess(repo: MongoRepository) = CommandLineRunner {...}