Working with Classes and Their Relationships in Java

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Working with Classes and Their Relationships
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3 A . Direct association is a has-a relationship.
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B, C, nd D are incorrect. a 4. Which association can be said as object A is part-of object B A. Direct association B. Temporary association C. Composition association D. Aggregation association Answer:
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3 D . Aggregation association is a part-of relationship. One object will be used to make up another object. However, neither object depends on the other for its existence and meaning.
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A, B, nd C are incorrect. a 5. Which association can be said as object A is composed-of object B A. Direct association B. Temporary association C. Composition association D. Aggregation association Answer:
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3 C . Composition association is a composed-of relationship. One object will be used to make up another object. If this relationship was lost, the meaning of the objects would also change. This is a strong relationship and has a life cycle responsibility for the inner object.
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, B, and D are incorrect. A 6. Which association has a life cycle responsibility for the object it contains A. Direct association B. Temporary association C. Composition association D. Aggregation association
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Self Test Answers
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3 C . Composition association has the responsibility to maintain the life cycle of the object that it is composed-of.
A, B, nd D are incorrect. They are all weak relationships that have no life cycle a responsibility. 7. Association navigation is best described as which of the following A. The ability to navigate, or access, an object that is contained in another object. B. The ability to search for and find an object that is contained in another object. C. The possibility of passing an object to another object via a method. D. The ability to invoke methods of an object that will then change the path of code execution.
e. The ability to invoke methods of an object to determine the current path of execution. Answer:
3 A A. ssociation navigation is the ability to access an object that is contained in another.
8. What would the multiplicity be in the following relationship A Lamp object has-a LightBulb object. A. One-to-one B. One-to-many C. Many-to-many Answer:
3 A . There is one Lamp object and one LightBulb object, therefore this is one-to-one.
9. A composition association cannot exist in what multiplicity A. One-to-one B. One-to-many C. Many-to-many
6:
Working with Classes and Their Relationships
Answer:
3 C is the correct answer. Composition association requires that it have responsibility for the life cycle of the objects it is composed-of. It is impossible to have this responsibility in a many-to-many relationship because many objects would contain references to all of the objects.
and B are incorrect. A 10. What would the multiplicity be in the following relationship A BookShelf object has-a reference to an array made up of Book objects. A. One-to-one B. One-to-many C. Many-to-many Answer:
3 B . BookShelf is a single object and contains a reference to an array of Book objects. The key to this question is the fact that you are dealing with an array. This means there are many Book objects; therefore it is a one-to-many relationship.
and C are incorrect. A
Class Compositions and Associations in Practice
Use the following code example for the next four questions:
public class Client { Address address; AccountNum[] accountNums; void setAddress(Address newAddress) { address = newAddress; } public Client() { accountNums = new AccountNum[2]; accountNums[0] = new AccountNum(); accountNums[1] = new AccountNum(); } }
Self Test Answers
11. In the preceding code segment, what is the relationship of the Client object and the address variable A. Direct association B. Temporary association C. Composition association D. Aggregation association Answer:
3 A . Direct association is the best answer, because logically a Client object has-an Address object.
B, C, nd D are incorrect. a 12. In the preceding code segment, what is the relationship of the Client object and the accountNums variable A. Direct association B. Temporary association C. Composition association D. Aggregation association Answer:
3 C . This is a composition association because the Client object is composed-of the AccountNum objects. This is a strong relationship since the Client object maintains the life cycle of the AccountNum objects.
A, B, nd D are incorrect. a 13. In the preceding code segment, what is the multiplicity between the Client object and the address variable A. One-to-one B. One-to-many C. Many-to-many
6:
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