End of Chapter

You may wish to review the following. Click on a subject that interests you to go to where it was discussed.

• Abstract class.
• Abstract method.
• When a class must be declared to be abstract.
• Advantage of using an abstract class.
• Can't instantiate an abstract class.
• Using a variable of a parent type.
• Polymorphism
• What types of objects a variable can refer to.

The next chapter will discuss more about polymorphism.