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Class Compositions and Associations in Practice
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relationship that implies a life cycle responsibility for the object that composes it. If many objects have a relationship with an object, it is impossible for any individual object to control the life cycle of the other object in the relationship. If the car example were broadened to a traffic simulator application, it would include many other Car objects. Each of these Car objects contains references to many other TrafficLight objects. This represents a direct association since a single Car object does not maintain the life cycle of the TrafficLight objects. Each car object has-a TrafficLight object. The relationship between a Car object and the TrafficLight object is weak. The TrafficLight objects are all shared between all of the Car objects. A many-to-many association does not have to include an equal number of objects on each side of the relationship. Relationships (for example, aggregation and composition) and multiplicities can be easily depicted with the Unified Modeling Language (UML). Drawing out class relationships can help convey design concepts to your fellow employees. UML diagrams are covered in 9.
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Association Navigation
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Association navigation is a term used to describe the direction in which a relationship can be traveled. An object that is contained within another object is said to be navigable if the containing object has methods for accessing the inner object. Most relationships are navigable in one direction, but if both objects contain references to the other, it is possible to have a bidirectional navigable relationship. Oftentimes, the methods for accessing inner objects are called getters and setters. A getter is a simple method that just returns an instance variable. A setter is a method that accepts an argument and uses it to set an instance variable.
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Class Compositions and Associations in Practice
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Exam Objective 3.3 Develop code that implements simple class associations, code that implements multiplicity using arrays, and recognize code that implements compositions as opposed to simple associations, and code that correctly implements association navigation.
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This section will review practical examples of association and composition relationships. It will also demonstrate how different multiplicities are represented in code. The SCJA exam will not require code to be produced. However, you may have to determine a type of association by examining a code segment. The following examples and explanations should help provide a solid understanding of these concepts. The topics listed next will be covered in the following sections:
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n Examples of class association relationships n Examples of class composition relationships n Examples of association navigation
Examples of Class Association Relationships
This section will examine associations. The following three examples will demonstrate possible multiplicities of an aggregation association. An explanation will follow highlighting the important points from the example. The topics covered include:
n One-to-one class association n One-to-many class association n Many-to-many class association
One-to-One Class Association
The following example is of a Truck object and Trailer object. This is an example of a one-to-one direct association.
public class Truck { /* This is an example of a one-to-one direct association */ Trailer trailer; void setTrailer(Trailer t){ trailer = t; } /* * Remainder of Truck class would be here */ }
In this example of a one-to-one association, the Truck object contains a reference to the Trailer object. This is a one-to-one association because the variable
Class Compositions and Associations in Practice
trailer is a single variable. It is not part of an array or collection. This example is a direct association because the Truck object is not responsible for the life cycle of the trailer variable. Another indication that it is a direct association is that logically the Truck object has-a Trailer object. In this example, and in most real-world
situations, it is not always easy or even possible to determine if one object controls the life cycle of another. Oftentimes, you must make the best determination based on the information that is available. In this example, the trailer variable is being set by the method setTrailer. Since this method is used to set the variable, it can be assumed that other objects contain a reference to the trailer object and therefore there is no sole object responsible for the life cycle of the object. Finally, since this was determined to be a direct association, the relationship can be generalized to just an association relationship.
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