Design and Implementation: Exercises

This quiz covers use case specification, OO design for real systems, inheritance hierarchies, sequence diagrams, state machines, configuration management, and open-source strategy

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QUESTION OF

Views #: 15

Questions #: 11

Time: 10 minutes

Pass Score: 80.0%

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Use Case: Report Status

1 pts

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Consider a weather station system. The 'Report status' use case sends status information about the weather station hardware to the weather information system. Based on the structured use case format (System, Use case, Actors, Data, Stimulus, Response, Comments), which of the following correctly describes the Data field for this use case?

The satellite link configuration parameters and communication protocols

A command string issued by the control system to restart the weather station

The summarized maximum, minimum, and average weather readings for the past collection period

The status of each instrument in the weather station - including whether each instrument is functioning correctly - plus the station identifier and any fault conditions detected

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Use Case: Reconfigure

1 pts

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The 'Reconfigure' use case allows the control system to change the configuration of the weather station software. Which of the following correctly describes the Stimulus and Response for this use case?

Stimulus: the satellite link is established; Response: the weather station transmits buffered data

Stimulus: the weather station detects an instrument failure; Response: the station sends a fault report to the weather information system

Stimulus: the control system sends a reconfiguration command specifying new settings (e.g., data collection frequency, instrument parameters); Response: the weather station acknowledges the command, applies the new configuration, and returns to its normal operating state

Stimulus: the weather information system requests a weather summary; Response: the station sends summarized weather data

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Mentcare System Use Cases

1 pts

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The Mentcare system manages details of patients consulting specialist doctors about mental health problems. When designing this system using an object-oriented approach, which of the following are plausible use cases? Select ALL that apply.

Prescribe medication - record and manage prescriptions for a patient

Generate report - produce management or clinical reports

Process payroll - calculate and distribute staff wages

Record consultation - document the details of a doctor-patient consultation

Transfer patient - move a patient's records to another care provider

View patient history - access a patient's complete medical history

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Object Classes for a Bank Account

1 pts

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Using the UML graphical notation for object classes, design a BankAccount object class. Which of the following sets of attributes and operations is most appropriate for a BankAccount class?

Attributes: accountNumber, holderName, balance, accountType; Operations: deposit(amount), withdraw(amount), getBalance(), transfer(amount, targetAccount), getStatement()

Attributes: branchCode, sortCode, swiftCode; Operations: openBranch(), closeBranch(), listAccounts()

Attributes: transactionId, timestamp, merchantName; Operations: authorize(), reverse(), void()

Attributes: username, password, sessionToken; Operations: login(), logout(), changePassword()

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Inheritance Hierarchy for Shapes

1 pts

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A shape can be classified as either 2-D or 3-D. Design an inheritance hierarchy. Which arrangement correctly represents the hierarchy with at least five shape classes?

Shape → Circle → Rectangle (with Triangle as a subclass of Circle)

Circle → Rectangle → Triangle → Sphere → Cube (linear inheritance chain)

2DShape and 3DShape as independent classes with no common superclass

Shape → 2DShape (Circle, Rectangle, Triangle) and Shape → 3DShape (Sphere, Cube)

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Sequence Diagram - Data Collection Subsystem

1 pts

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In a sequence diagram showing the interaction between the data collection subsystem and instruments (e.g., Anemometer, Barometer) in the weather station, what sequence of messages correctly describes how the WeatherStation collects data from instruments?

WeatherData directly queries each instrument sensor without any intermediate object

WeatherStation sends a collect() message to each instrument; each instrument collects sensor readings and stores them locally; when WeatherStation later calls getData(), each instrument returns its stored readings

The Satellite initiates data collection by sending a collect signal directly to each instrument

Instruments push data automatically to WeatherData without any request from WeatherStation

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Object Classes for a Group Diary System

1 pts

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A group diary and time management system supports the timetabling of meetings and appointments across co-workers. When an appointment involving multiple people is to be made, the system finds a common slot in each person's diary and arranges the appointment. Which of the following sets of object classes is most appropriate for this system? Select ALL that apply.

Appointment - represents a meeting or event with date, time, duration, and participants

Notification - represents alerts sent to participants when appointments are created or changed

NetworkRouter - represents the networking hardware for the system

TimeSlot - represents an available or blocked time period

Diary - represents a single person's diary with their appointments

User - represents a system user with their identity and preferences

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State Diagram for a Filling Station System

1 pts

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A fully automated filling (gas) station requires a state diagram. A driver swipes a card, credit is verified, fuel is dispensed, and the account is debited after the hose is returned. Which of the following represents the correct sequence of states?

Idle → CardReading → CardVerification → FuelAuthorized → Fuelling → HoseReturned → Billing → CardReturned → Idle

Idle → Fuelling → HoseReturned → Idle (with no payment processing states)

CardReading → Idle → FuelAuthorized → HoseReturned → Idle

Idle → Fuelling → CardVerification → Billing → Idle

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Configuration Management and Code Integration

1 pts

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When newly developed code is integrated into a larger system, problems may surface. Which of the following correctly explains how configuration management helps handle such integration problems?

Configuration management is only useful after software is deployed to customers, not during development

Configuration management replaces the need for testing after integration

Configuration management ensures all developers automatically use the correct component versions; tracks what changes were made and when; supports rollback to a previous working version when integration causes failures; and uses problem tracking to log, assign, and monitor resolution of integration issues

Configuration management prevents any bugs from being introduced into the system during integration

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Open-Source Strategy for a Specialized Product

1 pts

Please drag and drop the options to sort them

A small software company has developed a specialized product configured specifically for each customer. A potential new contract would more than double the customer base, but the new customer wants involvement in the software configuration. The company is considering making the software open source. Sort the following considerations from the most compelling reason TO go open source to the least compelling.

Community contributions will automatically improve the specialized product

Customers gain reassurance that they can support and maintain the software themselves if the company goes out of business

The major new customer can actively participate in configuration through the open-source model

The company can build a business model selling support, training, and cloud services around the open-source product

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Sequence Diagram - Group Diary Meeting Arrangement

1 pts

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In a sequence diagram for a group diary system where a group of people are arranging a meeting, what is the correct sequence of operations between key objects?

The system creates the appointment first, then checks if participants are available afterward

User → System: finds a slot, then simultaneously updates all diaries without checking availability

MeetingOrganizer sends findSlot() to each participant's Diary; each Diary returns available slots; MeetingOrganizer identifies a common slot; MeetingOrganizer sends createAppointment() to each participant's Diary; each Diary adds the appointment and sends a Notification to the participant

Diary objects automatically negotiate with each other to find a common slot without any user initiation

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Undergraduate Professional

Use Case: Report Status

Correct Answer

Explanation

Use Case: Reconfigure

Correct Answer

Explanation

Mentcare System Use Cases

Correct Answer

Explanation

Object Classes for a Bank Account

Correct Answer

Explanation

Inheritance Hierarchy for Shapes

Correct Answer

Explanation

Sequence Diagram - Data Collection Subsystem

Correct Answer

Explanation

Object Classes for a Group Diary System

Correct Answer

Explanation

State Diagram for a Filling Station System

Correct Answer

Explanation

Configuration Management and Code Integration

Correct Answer

Explanation

Open-Source Strategy for a Specialized Product

Correct Answer

Explanation

Sequence Diagram - Group Diary Meeting Arrangement

Correct Answer

Explanation

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