Lab: Experimenting with Abstract Classes


Name:                              


Part 1. Basics





1.5. 
    What error was generated?







1.8. 
    Why does this class compile even though it has a method with a
    missing method body?

    





1.11. 
    What error was generated?







1.15. 
    What error was generated and why?







1.16. 
    Why doesn't the declaration of the measure variable
    generate a compile-time error?

    


Part 2. Specializing an Abstract Class





2.2. 
    Is this class "concrete"?  Why or why not?

    





2.5. 
    What output was generated?







2.6. 
    Is this output correct?

    





2.9. 
    What error was generated?







2.12. 
    What code did you have in your implementation?
    




Part 3. Type Safety and Abstract Classes





3.3. 
    Why doesn't the expression
    myLength.equals(myWeight) generate a compile-time
    error?

    





3.5. 
    What output is generated?







3.6. 
    Why does the weight equal the length in the example above?
    (Note: We will see how this "problem" can be fixed later in the
    semester.)

    


Part 4. Using Abstract (and Concrete) Classes





4.3. 
    Did it execute correctly?

    





4.6. 
    Why didn't it compile?

    





4.10. 
    What error was generated?







4.12. 
    What changes did you make?