EX $9\mathrm{.}1$ Draw a UML class diagram showing an inheritance hierarchy containing classes that represent different types of clocks. Show the variables and method names for two of these classes

EX $9\mathrm{.}3$ Draw a UML class diagram showing an inheritance hierarchy containing classes that represent different types of cars, organized first by manufacturer. Show some appropriate variables and method names for at least two of these classes.

EX $9\mathrm{.}5$ Draw a UML class diagram showing an inheritance hierarchy containing classes that represent different types of airplanes. Show some appropriate variables and method names for at least two of these classes

EX $9\mathrm{.}8$ Experiment with a simple derivation relationship between two classes. Put println statements in constructors of both the parent and child classes. Do not explicitly call the constructor of the parent in the child. What happens? Why? Change the child$$s constructor to explicitly call the constructor of the parent. Now what happens?

EX $9\mathrm{.}10$ Describe the role of the Alert class