Which of the following statements is false?
a. References to interface types do not have access to method toString.
b. Method toString can be invoked implicitly on any object.
c. With inheritance, classes and their inherited classes tend to be very similar.
d. Dramatically different classes can often meaningfully implement the same interface.
A
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Consider the following relation for published books:
BOOK (Book_title, Authorname, Book_type, Listprice, Author_affil, Publisher) Author_affil referes to the affiliation of the author. Suppose the following dependencies exist: Book_title -> Publisher, Book_type Book_type -> Listprice Author_name -> Author-affil (a) What normal form is the relation in? Explain your answer. (b) Apply normalization until you cannot decompose the relations further. State the reasons behind each decomposition.
Task analysis may involve: (select all that apply)
- learning task-specific software - conducting ethnographic studies - speaking to application users about their experiences - quietly and unobtrusively watching as a user interacts with an application