Cake pattern with Java8 possible?

Question

I just wonder: with Java 8, and the possibility to add implementation in interfaces (a bit like Scala traits), will it be possible to implement the cake pattern, like we can

Answer 1

A few experiments suggest no:

• Nested classes are automatically static. This is inherently uncakelike:

  interface Car {
      class Engine { }
  }
  
  // ...
      Car car = new Car() { };
      Car.Engine e = car.new Engine();
  
  error: qualified new of static class
      Car.Engine e = car.new Engine();
  

• So, apparently, are nested interfaces, although it's harder to coax out the error messages:

  interface Car {
      interface Engine { }
  }
  
  // ...
      Car car = new Car() { };
      class Yo implements car.Engine {
      }
  
   error: package car does not exist
          class Yo implements car.Engine {
  
   // ...
  
  class Yo implements Car.Engine {
  }                                                                                                      
  
  
   // compiles ok.
  

So, without instance member classes, you do not have path dependent types, which is basically necessary for the cake pattern. So at least, no, not in the straightforward way, it is not possible.