Look back at the OblongGUI that we developed in Sect XXXXXXXXXXModify the code so that as well as checking that the values have been entered, it also checks that the values entered are not zero, and...

Look back at the OblongGUI that we developed in Sect. 10.8. Modify the code so that as well as checking that the values have been entered, it also checks that the values entered are not zero, and that the length and height are not equal. Describe the class associations given in the UML design of Fig. 11.1.