Auto-generate lambda expression as argument in IntelliJ

Question

How do I get IntelliJ to auto-generate a lambda expression as the argument being passed?

What I want:

I have seen the Question How to autocomplete lambdas in IntelliJ IDEA?, but that does not seem to produce my desired result.

Answer 1

As Tagir Valeev already mentioned in his comment, IntelliJ will auto-generate lambda code, but only if your ClickListener is a (functional) interface.

E.g.:

@FunctionalInterface
interface ClickListener {
  void listen();
}

class Clicker {
   void addClickListener(ClickListener listener){
      // ...
   }
}

Then, Intellij suggests upon hitting Ctrl+Shift+Space

Note: As to the @FunctionalInterface annotation, Jav Doc says

This annotation is not a requirement for the compiler to recognize an interface as a functional interface