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14. Code that is after a return statement will be executed but cannot change the variable that is being returned. a. True B. False Answer:
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3 O B. nce a return statement is executed, the flow of execution returns to the code that invoked the method.
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3 B . Even though it would be possible to return data back from a method by using this practice, it is not considered a good coding practice.
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U nderstanding Class Compositions and Associations C lass Compositions and Associations in Practice
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6:
Working with Classes and Their Relationships
CERTIFICATION OBJECTIVE
Understanding Class Compositions and Associations
Exam Objective 1.3 Describe, compare, and contrast class compositions, and associations (including multiplicity: one-to-one, one-to-many, and many-to-many) and , association navigation. Composition and association are two general descriptions for object relationships. The SCJA exam will ask about the relationship between objects and require the test taker to distinguish between a composition or just an association relationship. Composition and association can be further broken down into four more specific types of relationship descriptors. Each descriptor will be covered in this chapter. The four specific relationship types are not directly on the SCJA, but by studying them you will have a greater understanding of the difference between composition and association. These concepts will also be present in the UML section of the SCJA exam. Finally, multiplicities will be discussed. Every object relationship has a multiplicity. The SCJA exam will require you to determine the multiplicity based on a given scenario or code segment. The following topics will be covered in this chapter:
n Class compositions and associations n Class relationships n Multiplicities n Association navigation
Class Compositions and Associations
Composition and association are the general terms used to describe a class relationship. An association or composition relationship is formed between two objects when one contains a reference to the other. The reference is often stored as an instance variable. The reference may be in one direction or bidirectional. An association relationship is a relationship of two objects where neither one directly depends on the other for their logical meaning. For example, object A has an association relationship with object B. If this relationship was lost, both objects
Understanding Class Compositions and Associations
would still retain the same meaning they previously had. These relationships are considered weak. Objects in an association relationship have no dependence on each other for the management of their life cycle. In other words, the existence of an object is not tied to the existence of the other object in the relationship. Another example would be a CarFactory object and a CarFrame object. The CarFactory object and CarFrame object have an association relationship. If this relationship no longer existed, each object could continue to logically make sense and retain its original meaning on its own. A composition relationship is stronger than an association relationship. Composition means that one object is composed of another. An object may be composed of one or multiple objects. If object A is composed of object B, it depends on object B. This statement does not imply that object A is only composed of object B. Object A may also be composed of other objects. If the relationship were lost between object A and object B, the logical meaning of the objects would be lost or significantly altered. In this example, object B the inner object that object A is composed-of would depend on object A to manage its life cycle. The existence of object B is directly tied to the existence of object A. When object A no longer exists, object B would also no longer exist. Object B would also become nonexistent if the relationship between the two objects were lost. Examples of objects that have a composition relationship tend to be more abstract than association relationships. A Car object and CarStatus object would be an example of a composition relationship. The Car object is composed-of the CarStatus object. Both objects depend on this relationship to define their meanings. The CarStatus object also depends on the Car object to maintain its life cycle. When the Car object no longer exists, the CarStatus object would also no longer exist.
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