Java Question method inheritance

[ltrebuchet]

Still working on a library to control the ambient mode of a wearable app, I constructed a jar file with two classes (see attached). Class wearambient extends WearableActivity including a constructor and a method which calls super method setAmbientEnabled. Class wearobject includes a method which intitalizes an instance of wearambient class and calls this method.
These are called in Activity create at FirstTime:

Sub Process_Globals
    Dim Wear As wearobject

Sub Activity_Create(FirstTime As Boolean)
    If FirstTime Then
        Wear.Initialize("Wear")
    End If

The app compiles and does not crash, but does not setAmbientEnabled either. I thought that the instance would inherit this method, it does not seem so.
Thanks for your help, Louis