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Generalization is expressed as an is-a relationship where a class allows its more general attributes and operations to be inherited. In Figure 9-2, ClassB inherits from AbstractClassA and also from ClassA. AbstractClassA inherits from ClassA. We can also say ClassB is-an AbstractClassA, ClassB is-a ClassA, and AbstractClassA is-a ClassA. We could also say that ClassA and AbstractClassA are superclasses to ClassB, and appropriately, ClassB would be their subclass. The generalization class relationship is depicted with a solid line and a closed arrowhead.
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Realization
Realization is the general principle of implementing an interface. AbstractClassA implements the InterfaceA interface. ClassB implements the InterfaceB interface. The realization class relationship is depicted with a dotted line and a closed solid arrowhead or the lollipop element.
Code Engineering from UMl Diagrams
UML provides many benefits; it is not limited to just explaining existing code. When a system architect or system designer models the classes for a particular application, someone will need to develop code to those models. Many UML modeling tools can automatically generate the code structure for these models. However, most coders will use UML as a guide and choose to begin their coding from scratch. Let s examine what the code would look like for each of the elements in Figure 9-2 with the following Scenario & Solution.
SCEnARIO & SOLUTIOn
You need to write the code for the ClassA class. What will it look like You need to write the code for the ClassB class. What will it look like You need to write the code for the AbstractClassA class. What will it look like You need to write the code for the InterfaceA interface. What will it look like You need to write the code for the InterfaceB interface. What will it look like
public ClassA {} public ClassB extends AbstractClassA implements InterfaceB {} public AbstractClassA extends ClassA implements InterfaceA {} public interface InterfaceA {} public interface InterfaceB {}
Recognizing Representations of Significant UML Elements
UML features are commonly integrated into many tools such as ComputerAided Software Engineering (CASE) tools and Integrated Development Environments (IDEs) such as Sparx Systems Enterprise Architect and Sun Java Studio Enterprise IDE, respectively. An added benefit of UML integration with these tools is forward and reverse code engineering. As such, generating UML from code can be beneficial when taking over an existing project.This is because you will be able to clearly see a class relationship in the UML diagrams.
Attributes and Operations
Attributes, also known as member variables, define the state of a class. Operations, sometimes called member functions, detail the methods of a class. Let s take a look at adding attributes and operations to a class UML diagram. The following is a code listing for an arbitrary PrimeNumber class. We will depict this class with UML.
import java.util.ArrayList; import java.util.List; public class PrimeNumber { private Boolean isPrime = true; private Double primeSquareRoot = null; private List<String> divisorList = new ArrayList<String>(); public PrimeNumber(long candidate) { validatePrime(candidate); } public void validatePrime(Long c) { primeSquareRoot = Math.sqrt(c); isPrime = true; for (long j = 2; j <= primeSquareRoot.longValue(); j++) { if ((c % j) == 0) { divisorList.add(j + "x" + c / j); isPrime = false; } } } public List getDivisorList() { return divisorList; } public Double getPrimeSquareRoot() { return primeSquareRoot; } public Boolean getIsPrime() {
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Representing Object-Oriented Concepts with UML
return isPrime; } public void setIsPrime(Boolean b) { isPrime = b; } }
Before we actually look at the associated UML diagram(s), let s examine the scope and required format for the information within the attributes and operations compartments.
Attributes Compartment
The attributes compartment houses the classes attributes, also known as member variables. The attributes compartment is optionally present under the name compartment of the class diagram. The UML usage for each variable of the attributes compartment is detailed, but for the scope of the test you will only need to be concerned with the following optionally condensed attributes format:
[<visibility>] <variable_name> [: <type>] [= default_value]
Here, visibility defines the optionally displayed visibility modifier. The name would be the variable s name, and the type would be the type of the variable.
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