1 Write the use case for returning a book to the library, as discussed in this section. 2 Modify the class diagram shown in Figure 12.8 to include the Library class. You should assume that that a...

1 Write the use case for returning a book to the library, as discussed in this section.

2 Modify the class diagram shown in Figure 12.8 to include the Library class. You should assume that that a library contains zero or more books and patrons.

3 Explain the difference between aggregation and composition; use an example.

4. A blackjack game uses a deck of cards. As cards are dealt from the deck, it gradually becomes empty. Draw a class diagram that shows the relationships among the classes Card, Deck, and BlackjackGame. Be sure to show any multiplicities in the relationships.