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Operations Compartment
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The operations compartment houses the classes operations, also known as member functions or methods. The operations compartment is optionally present under the attributes compartment of the class diagram. If the attributes compartment is excluded, then the operations compartment may reside under the name compartment of the class diagram. The UML usage for each method of the operations compartment is detailed, but for the scope of the test, you will only need to be concerned with the following optionally condensed operations format:
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[<visibility>] <method_name> [<parameter-list>] [: <return-type>]
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Here, visibility defines the optionally displayed visibility modifier. The name would be the method s name, the optionally displayed parameter-list is just as it says, and this is the same for the return-type.
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Recognizing Representations of Significant UML Elements
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Most items in UML are optional. As such, there is no need to show all attributes of a class. For the exam, the presence of all necessary attributes and operations can be assumed.
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Displaying the Attributes and Operations Compartments
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The display of level-of-detail information in regards to most UML elements is optional. This is true for the member variables and methods in the attributes and operations compartments as well. Figure 9-3 shows a more complete usage as defined in the compartment sections. In Figure 9-4, a more condensed representation of attributes and operations usages is shown with the following: For attributes: <variable_name> [: <type>] For operations: <method_name> [<parameter-list>] Both representations are valid, and by taking the time to completely understand this, it will lessen your confusion when taking the exam. Know your audience when creating UML diagrams. Sometimes class diagrams without representations of the attributes and operations compartments may be more appropriate for a given presentation or document. If you took the time to create these compartments or generated them from the code, you won t necessarily have to discard your work. Many UML tools allow you to hide the attributes and operations compartments in the diagrams via checkbox selections in configuration dialog boxes.
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FIGURE 9-3 PrimeNumber divisorList: List<String> = new ArrayList<S isPrime: Boolean = true primeSquareRoot: Double = null + + + + + + getDivisorList() : List getIsPrime() : Boolean getPrimeSquareRoot() : Double PrimeNumber(candidate : long) setIsPrime(b : Boolean) : void validatePrime(c : Long) : void
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Detailed attributes and operations compartments
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9:
Representing Object-Oriented Concepts with UML
FIGURE 9-4
PrimeNumber divisorList: List<String> isPrime: Boolean primeSquareRoot: Double getDivisorList() getIsPrime() getPrimeSquareRoot() PrimeNumber(long) setIsPrime(Boolean) validatePrime(Long)
Abbreviated attributes and operations compartments
Visibility Modifiers
As you are aware, there are four access modifiers: public, private, protected, and package-private. These modifiers are depicted with symbols in UML and are used as shorthand in the attributes and operations compartments of a class diagram. These symbols are known as visibility modifiers or visibility indicators. The visibility indicator for the public access modifier is the plus sign (+). The visibility indicator for the private access modifier is the minus sign ( ), while the visibility indicator for the protected access modifier is the pound sign (#), and the visibility indicator for the package-private modifier is the tilde (~) modifier. The protected and package-private visibility indicators are not on the exam. All four visibility modifiers are depicted in Figure 9-5 within the attributes and operations compartments. Visibility indicators are also optional and need not be displayed.
FIGURE 9-5
AccessModifiersClass + # ~ + # ~ variable1: int variable2: int variable3: int variable4: int method1() : void method2() : void method3() : void method4() : void
Visibility modifiers
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FIGURE 9-6
java.io PipedWriter closed: boolean = false sink: PipedReader + close() : void + connect(snk : PipedReader) : void + flush() : void + PipedWriter(snk : PipedReader) + PipedWriter() + write(c : int) : void + write(cbuf : char[], off : int, len : int) : void
Tight encapsulation
You may need to know when a class is tightly encapsulated. You can look for the presence of only private (-) visibility indicators in the attributes compartment. When all of the instance variables have private access modifiers, you will know that there is no state of the object that can be directly accessed from outside of the class, thus tight encapsulation is achieved. An example is represented in Figure 9-6.
Several UML modeling tools are both freely and commercially available in the marketplace. Being familiar with these tools will make you more productive in the workplace, will assist in collaboration, and will ultimately give you a more professional edge.
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