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SCenARio & SolUTion
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You have an object that controls the life cycle of another object. What term can be used to describe it You have an object that has a weak relationship with another object. What term can be used to describe it You have an object that has a strong relationship with another object. What term can be used to describe it Composition Association Composition
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Working with Classes and Their Relationships
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In many cases, it is not as clear as the preceding examples regarding what type of relationship two objects possess. Some interpretation is needed to determine the relationship. A composition will always be responsible for an object s life cycle. Composition relationships also represent a stronger relationship compared to an association. Objects belonging to an association make more sense by themselves than objects of composition.
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Class Relationships
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This section will break down the specific class relationships that are possible. Each one represents a different way objects can have relationships. In total, there are four detailed types of relationships: direct association, composition association, aggregation association, and temporary association. The objective on the SCJA exam presents association and composition as if they were mutually exclusive. In fact, composition association is just one of the detailed relationship types. This relationship is referred to as composition on the SCJA exam. The other three detailed relationship types are referred to as just association. The SCJA exam will contain questions that require the highest-level knowledge of these relationships. The questions on the exam will only require the determination of association versus composition. However, it would be unwise to ignore this section since the understanding of these topics will help make the determination of the relationship much easier.
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Composition and association are general terms used to describe object relationships.The SCJA exam will give a code segment or scenario that will require the determination of what general type of relationship is present. Association relationships can be broken down into more specific terms. Composition is a special type of association, but on the SCJA exam it will only be referred to as composition.The next section will discuss the four specific types of object relationships. It is important to remember that you are only required to determine if a relationship is a composition or an association on the exam.
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Understanding Class Compositions and Associations
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The following topics will be covered in the next few sections:
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n Direct association n Composition association n Aggregation association n Temporary association
Direct Association
Direct association describes a has-a relationship. This is a basic association that represents navigability. Direct association is a weak relationship and therefore can be generalized to an association. There is no life cycle responsibility and each object in the relationship can conceptually be independent. This tends to be the default association when nothing else can accurately describe the relationship. If a truck was modeled as an object to create a Truck object, it may have a Trailer object that it has a direct association with. The Truck object and Trailer object are weakly associated because each could be used without the other and still maintain their intended purpose. A Truck object does not need to have a Trailer object, and a Trailer object is not required for the construction of the Truck object. This direct association relationship is depicted in the UML diagram in Figure 6-1.
Composition Association
Composition associations are used to describe an object s relationship where one object is composed of one or more objects. A composition association is a strong relationship and will be generalized as composition on the SCJA exam. The internal object only makes conceptual sense while stored in the containing object. This relationship represents ownership. A composition association can be described as object A is composed-of object B. For example, a Tire object would be composedof a TireAirPressure object. The Tire object requires a TireAirPressure object; the TireAirPressure object is not very useful by itself. The containing object also has the responsibility of managing the life cycle of the internal object. It is possible for this object to pass the life cycle management to another object. Life cycle management means that the object composed of the
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