QUESTION: 37

Choose the correct answer :

Which object has the highest value that is properly assigned to a salary slot?

A)

B)

C)

D)

E)

Option A
Option B
Option C
Option D
Option E

Answer(s): D

Explanation:

In UML, when specifying the value of an attribute in an instance specification (which is what each of these boxes represents), the notation used is generally:

attributeName: Type = Value

Looking at each option provided, we see that they are different representations of numerical values for an attribute named salary of type Real. Here's how to interpret each representation:

A) -salary: Real = "$10,000.00" - This uses a string representation of the number, which is generally not how numerical values are assigned in UML, especially with the explicit type Real.

B) -salary: Real = $20,000.00 - This is more typical for showing a real number in UML, though the dollar sign is not part of the actual numerical value and should not be included.

C) -salary: Real = 30000.00 - This is a correct numeric representation of a real number without unnecessary symbols.

D) -salary: Real = 40,000.00 - This is also a correct representation and indeed has the highest numeric value among the options provided.

E) -salary: Real = 500 E 02 - This is scientific notation, which is also a valid representation of real numbers in UML. The value represented here is 500 * 10^2, which equals 50,000.00.

After examining each option, the correct answer is D. Option D, because the instance four:Employee has the highest value properly assigned to a salary slot according to the standard UML notation. However, there's a point to be clarified: while UML does not specify formatting of numbers with commas for thousands or currency symbols, it does accept scientific notation. So, if we were strictly interpreting the values as real numbers, Option E would represent the highest numerical value. But considering proper UML formatting and assuming the intent is to use standard decimal notation without currency symbols or commas, Option D is the best answer.

Reference:

Object Management Group (OMG) Unified Modeling Language (UML) Specification Version 2.5.1 Section 9.6 on Instance Specification which details the notation for instance specification including slots for attributes.

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QUESTION: 38

Choose the correct answer :

Consider the following diagram:

Which change could the modeler make to fix the UML error in this model?

Specify a unique value in the position slot for each instance specification
Add a description slot to a 1.
Change the type of ClassB.version from Real to Integer
Change the type of ClassA.position from Integer to Real.

Answer(s): B

Explanation:

In the UML diagram given, we see two classes, ClassA and ClassB, with ClassB inheriting from ClassA. ClassA has two attributes, position of type Integer and description of type String. ClassB introduces an additional attribute, version of type Real.

Looking at the instance specifications (the right part of the diagram), we have three instances: a1 of type ClassA, b1 of type ClassB, and b2 also of type ClassB.

In UML, an instance specification must comply with the structure of its classifier, which means an instance of ClassA must show slots for both position and description, whereas an instance of ClassB must show slots for position, description, and version.

In the provided diagram, instance a1 of ClassA only shows a slot for position. This is an error because it does not show a slot for description, which is a defined attribute of ClassA. To correct this error, we would need to add a description slot to a1.

This means that the correct answer is:

B . Add a description slot to a1.

The other options do not correct the error in the model:

A) Specifying unique values for position does not address the missing description slot in a1. C) Changing the type of ClassB.version from Real to Integer is not required by any UML constraint in the context given. D) Changing the type of ClassA.position from Integer to Real does not address the missing description slot in a1 and is unrelated to the inheritance structure.

Reference:

Object Management Group (OMG) Unified Modeling Language (UML) Specification Version 2.5.1 Section 9.6 Instance Specification.

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QUESTION: 39

Choose the correct answer :

Consider the following diagram fragment:

Which slot's value is hidden outside of the current Employee9

age
name
salary
title
gender
company

Answer(s): C

Explanation:

The diagram fragment shows an instance specification for an Employee. The different prefixes before each attribute indicate the visibility of that attribute:

+ Public: Visible to everyone.

- Private: Visible only within the defining class.

# Protected: Visible to subclasses and package.

~ Package: Visible to all classes within the same package.

Given these visibility indicators, the attribute with the private visibility is -salary: Real. This means that the salary attribute is the one that is hidden outside of the current:Employee classifier and cannot be accessed by entities that do not belong to the Employee class.

Therefore, the correct answer is:

C . salary

Reference:

Object Management Group (OMG) Unified Modeling Language (UML) Specification Version 2.5.1 Section 7.4 on Properties, specifically visibility of properties.

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QUESTION: 40

Choose the correct answer :

How many class instances can be shown on an Object Diagram?

0
1
1..*
0..*

Answer(s): D

Explanation:

In UML, an Object Diagram is a type of static structure diagram that shows a snapshot of the detailed state of a system at a point in time. It focuses on some particular set of objects and attributes, and the links between them.
When it comes to the number of instances that can be represented in an Object Diagram, it can range from zero (in cases where the diagram is used to show that no instances of a class exist under certain conditions) to many instances. Therefore, an Object Diagram can show 0 instances, 1 instance, or many instances, which is represented by the multiplicity notation 0..*.

Therefore, the correct answer is:

D . 0..*

Reference:

Object Management Group (OMG) Unified Modeling Language (UML) Specification Version 2.5.1 Section 9.8 on Object Diagrams (Instance Specifications).

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