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q One-to-many relationships are possible with both composition and association. q One-to-many relationships are one object that contains a reference to an
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array or collection of similar objects.
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q Many-to-many relationships are possible only with association. q Many-to-many relationships have many similar objects that contain
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a reference to the same array or collection of objects.
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q Association navigation is a term used to describe the ability to access an
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object that is contained in another object.
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q Relationships may be able to navigate bidirectional or unidirectional. q Getter methods are often used to navigate an inner object.
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Class Compositions and Associations in Practice
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q In an association, the inner object normally is not created in the containing
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object but is instead passed to it as a method argument.
q In a composition, the inner object is normally created in the containing
object.
q In a one-to-many relationship, the inner object is stored in an array or
collection.
q A many-to-many relationship is when objects in an array or collection each
contain a reference to another array or collection.
q A many-to-many relationship can only exist for associations.
Self Test
SElF TEST
Understanding Class Compositions and Associations
1. What associations are considered weak relationships (Choose all that apply.) A. Direct association B. Temporary association C. Composition association D. Aggregation association 2. What associations are considered strong relationships (Choose all that apply.) A. Direct association B. Temporary association C. Composition association D. Aggregation association 3. Which association can be said as object A has-an object B A. Direct association B. Temporary association C. Composition association D. Aggregation association 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 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
6:
Working with Classes and Their Relationships
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 7. Association navigation is best described as which of the following A. B. C. D. The ability to navigate, or access, an object that is contained in another object. The ability to search for and find an object that is contained in another object. The possibility of passing an object to another object via a method. 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. 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 9. A composition association cannot exist in what multiplicity A. One-to-one B. One-to-many C. Many-to-many 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
Class Compositions and Associations in Practice
Use the following code example for the next four questions:
public class Client { Address address;
Self Test
AccountNum[] accountNums; void setAddress(Address newAddress) { address = newAddress; } public Client() { accountNums = new AccountNum[2]; accountNums[0] = new AccountNum(); accountNums[1] = new AccountNum(); } }
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 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 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 14. In the preceding code segment, what is the multiplicity between the Client object and the accountNums variable A. One-to-one B. One-to-many C. Many-to-many
6:
Working with Classes and Their Relationships
15. Which of the following statements are true (Choose all that apply.) A. Association navigation can be quad-directional. B. Association navigation can be bidirectional. C. Association navigation can have no direction. D. Association navigation can be unidirectional.
Self Test Answers
SElF TEST ANSwERS
Understanding Class Compositions and Associations
1. What associations are considered weak relationships (Choose all that apply.) A. Direct association B. Temporary association C. Composition association D. Aggregation association Answer:
3 , and D. Each of these associations is considered weak. This means that they do not A, B have any life cycle responsibility and that if the relationship was lost, each object would still maintain its meaning.
is incorrect. This is an example of composition and has a strong relationship. B 2. What associations are considered strong relationships (Choose all that apply.) A. Direct association B. Temporary association C. Composition association D. Aggregation association Answer:
3 C . This association is considered strong. It does have a life cycle responsibility and if the relationship was lost, each object would lose some or all of its meaning.
A, B, nd D are incorrect. They are examples of associations that have weak relationships. a 3. Which association can be said as object A has-an object B A. Direct association B. Temporary association C. Composition association D. Aggregation association
6:
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