Method return type to fulfill multiple interfaces

Question

Is it possible to specify a method which returns a object that implements two or multiple interfaces?

Say we have the following interfaces:

interface Foo         


        

Answer 1

You could return a container to provide Foo and Bar.

public class Container{
   private FooBarBam foobar;
   public Bar asBar(){
      return foobar;
   }
   public Foo asFoo(){
      return foobar;
   }
}

This way your code would not have to implement a third interface. Downside is that it is an additional layer of indirection.

As for why the generic approach does not work: there is no way to provide the type of T and the compiler can't just guess its type, so resolving T is not possible.

davin's answer looks good but also requires a public class/interface which implements Foo and Bar to work.

Update:

The problem is that the compiler does not know that the type of T should be FooAndBarImpl, it would have to guess and a guessing compiler leads to bad and unpredictable code.

Even a hack using Lists wont compile since the & operator is not supported. While it should be possible to implement it looks like generics currently don't support multiple bounds within return types.

//Does not compile expecting > after Foo
List getFooBar(){
    final List l = new ArrayList();
    l.add(new FooAndBarImpl());
    return l;
}