CMPT 270: MVC Architecture Quiz
18 Questions
2 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the primary responsibility of the Model in the MVC architecture?

  • Takes user input and visualize data
  • Holds and manipulates data while performing business logic (correct)
  • Displays the output and user interface elements
  • Converts user input into messages for the Controller
  • In the MVC architecture, what action does the Controller perform?

  • Updates the View when the data changes
  • Displays visual representations of the data
  • Receives user input and converts it into messages to the Model (correct)
  • Manipulates the data stored in the Model
  • What is a key benefit of utilizing MVC architecture in software development?

  • Fosters a monolithic structure for applications
  • Encourages separation of concerns for better code reusability (correct)
  • Promotes interpretation of data in a single layer
  • Increases the number of lines of code needed
  • Which of the following best describes the interaction cycle in MVC?

    <p>The cycle involves user input triggering updates that flow through Model, View, and Controller</p> Signup and view all the answers

    How does the View in the MVC architecture know when to update its display?

    <p>The Model notifies the View through the Observer interface</p> Signup and view all the answers

    What programming paradigm does MVC combine well with for building interactive applications?

    <p>Observer Pattern for state management</p> Signup and view all the answers

    Which statement regarding the history of MVC is correct?

    <p>MVC originated in SmallTalk during the 1970s and is platform-agnostic</p> Signup and view all the answers

    What does the View do in the MVC structure?

    <p>It presents data and visualizes the output to the user</p> Signup and view all the answers

    What must be called in the model after a data change occurs to indicate that a change has happened?

    <p>setChanged()</p> Signup and view all the answers

    What happens when notifyObservers() is called without any arguments?

    <p>It simply runs the update() method of each observer.</p> Signup and view all the answers

    Which method allows the Model to send data to the Observers when notifying them?

    <p>notifyObservers(Object arg)</p> Signup and view all the answers

    Which component is primarily responsible for responding to user interactions in the MVC architecture?

    <p>Controller</p> Signup and view all the answers

    What is a benefit of using the Observer pattern in the MVC architecture?

    <p>Loose coupling between Model and View</p> Signup and view all the answers

    How does the View request data from the Model in a pull architecture?

    <p>Through accessor methods</p> Signup and view all the answers

    What is an example of how multiple Views can be utilized within the MVC with Observer pattern?

    <p>Different Views can provide varied representations of the same Model.</p> Signup and view all the answers

    What role does the Observable class play in the MVC architecture?

    <p>It manages the list of Observers.</p> Signup and view all the answers

    Why might a View choose to use push updates over pull?

    <p>To reduce the need for direct Model access.</p> Signup and view all the answers

    What does the Controller do when an event, like a button click, occurs?

    <p>Initiates a method to change the Model.</p> Signup and view all the answers

    Study Notes

    CMPT 270: Developing Object Oriented Systems - Model-View-Controller Architecture

    • The course covers object-oriented system development using the Model-View-Controller (MVC) architecture.
    • Learning objectives include understanding MVC architecture, differentiating it from three-layer architecture, and implementing MVC using the Observer pattern.

    Model-View-Controller Design Pattern

    • Model: Holds and manipulates data, performs business logic, notifies the View when data changes.
    • View: Takes user input, presents and visualizes data.
    • Controller: Receives user input, converts it into messages for the Model.

    MVC - Interaction Cycle

    • The MVC architecture mirrors the human interaction cycle with an interactive application.
    • The flow is: Real World → User → View → Controller → Model → Program/System

    Benefits of MVC

    • Provides a recognizable structure to applications.
    • Offers separation of concerns, which promotes code reusability.

    Adoption of MVC

    • MVC, originally introduced in SmallTalk in the 1970s, is language- and platform-agnostic.
    • It's commonly used to develop user interfaces by dividing related program logic into three interconnected elements.
    • Frequently used in games and visually interactive systems (like drawing applications).

    Exercise 1: A Simple MVC System

    • Create classes for the Model, View, and Controller.
    • Develop a simple incrementing calculator program using MVC.

    MVC with Observer Pattern

    • The View implements the Observer interface.
    • The Model's update() method is called when its data changes.
    • The Model tells the View its data has changed using notifyObservers().

    Model - Observable

    • The Model should inherit from the Observable class in Java.
    • This lets the Model have Observers added to it.
    • The addObserver() method is inherited from the Observable class.
    • model.addObserver(view) is typically placed after creating the Model and View to enable the View to receive notifications when the Model changes.

    In the Model

    • After making a data change, use setChanged() to signal the data alteration.
    • notifyObservers() tells all observers the model has updated.
    • This triggers the update() method in the observers.

    Updating the View

    • The View, after being notified of an update, can either fetch model data using accessor methods (pull) or receive updated data directly (push).
    • When employing pull, the View must access the Model (typically as an instance variable).

    Push Updates

    • Use notifyObservers(Object arg) to send specific data to observers when the model changes. This is a push update method.
    • If push updates are used, the View does not need direct access to the model.

    Observers

    • A model can have multiple observers.
    • All observers are notified when the model changes.
    • The Model has little knowledge of its observers; this promotes code reuse and reduces coupling.

    Controller

    • The controller handles user interactions and communicates to the Model.
    • If a user action (like a button click) occurs, the controller tells the Model to change.
    • This triggers notifications to observers (like the View), that data may have changed.

    Example 2: MVC with Observer

    • Refactor the simple MVC system to integrate the Observer pattern.

    Exercise 3: MVC with Multiple Views

    • MVC with the Observer pattern promotes loose coupling between the Model and View.
    • Multiple views can receive updates from the Model and display the model in different ways (e.g., video game, minimap).
    • Add a second view and include it in the Model's observers.

    Summary

    • MVC is commonly used to build interactive systems.
    • The Observer pattern simplifies updating the view when the model changes.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Related Documents

    Description

    Test your knowledge on the Model-View-Controller (MVC) architecture in object-oriented systems. This quiz covers the fundamental concepts, interaction cycles, and benefits of MVC in system development. Perfect for students of CMPT 270.

    More Like This

    MVC Architecture Quiz
    10 questions

    MVC Architecture Quiz

    ForemostMagnolia avatar
    ForemostMagnolia
    Web Architecture: Separation of Concerns
    37 questions
    HTML and MVC Concepts Quiz
    37 questions

    HTML and MVC Concepts Quiz

    ProfoundWonder9184 avatar
    ProfoundWonder9184
    Use Quizgecko on...
    Browser
    Browser