Weak Calculator

The first version of this lesson is due to Xavier Blanc

We consider the following graphic application :

WeakCalc1

and after distortion :

WeakCalc2

  1. Give the tree of the graphic components.
  2. Give the layout(s) used in this interface.
  3. Write the code of the interface.
  4. Add a listener on the button "=" to apply the "plus" operation.