Cannot Access Fields and Methods of Implementation Class Implementing an Interface

[Calem Bendell]

Given:

class A { 
  class B { }
  class C implements B { }
  private B;
}

If TouchCORE is used to make B an instance of C, then the extensions unique to C cannot be called and a lifeline to class C cannot be drawn, only a lifeline to B.

This is demonstrated in the attached snapshot, where a MinuetoFrame has been created as the class' MinuetoWindow. When the minuetowindow field is assigned the value of the constructor for MinuetoFrame, the lifeline is converted to a MinuetoWindow, from which methods unique to MinuetoFrame cannot be accessed.

This may be user error :-)

[Calem Bendell]

[Matthias Schoettle]

If you assign the return to an existing association in the structural view that refers to MinuetoWindow then it makes sense that you can only call operations that MinuetoWindow has.

What I mean is:

MinuetoWindow window;
window = new MinuetoFrame(...);
// when calling methods on window, you can only call those of MinuetoWindow unless you cast it to MinuetoFrame

If you pressed the plus button to create a local variable, then I agree that it should create one of type MinuetoFrame, but this should work. correct?