SWE202: GRASP Patterns in Software Construction
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Questions and Answers

According to the GRASP principle of Information Expert, which class should be responsible for creating instances of a new bank account?

  • Bank (correct)
  • BankAccount
  • AccountManager
  • TransactionController

    • What is the main goal of the Low Coupling GRASP pattern?

  • To promote high cohesion
  • To reduce system events
  • To minimize dependencies between classes (correct)
  • To increase dependencies between classes

    • Which GRASP principle is responsible for assigning the responsibility of handling system events or coordinating activities to a controller class?

  • Information Expert
  • Low Coupling
  • High Cohesion
  • Controller (correct)

    • What is the main advantage of using the Observer pattern in the GRASP principle of Low Coupling?

    <p>To notify interested parties of changes in bank account balances without tightly coupling them to the BankAccount class</p> Signup and view all the answers

    According to the GRASP principle of Information Expert, which class should be responsible for calculating interest on a bank account?

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

    What is the main goal of the High Cohesion GRASP pattern?

    <p>To assign a responsibility to the class that has the necessary information to fulfill it</p> Signup and view all the answers

    Which GRASP principle is responsible for determining which class should handle the process of transferring funds between bank accounts?

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

    What is the main benefit of using the GRASP patterns in system design?

    <p>To facilitate easier maintenance and flexibility in the system</p> Signup and view all the answers

    What are the two types of responsibilities of an object?

    <p>Knowing and Doing</p> Signup and view all the answers

    What does the 'doing' responsibility of an object include?

    <p>Initiating action in other objects</p> Signup and view all the answers

    What is the primary purpose of GRASP patterns?

    <p>To assign responsibilities to objects</p> Signup and view all the answers

    What is the problem solved by the Information Expert pattern?

    <p>What is a basic principle by which to assign responsibilities to objects?</p> Signup and view all the answers

    Which GRASP pattern assigns the responsibility of creating instances of a class to the class that has the most knowledge about when and how to create them?

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

    What is a characteristic of a GRASP pattern?

    <p>It is a named problem/solution pair that can be applied in new contexts</p> Signup and view all the answers

    What is an example of a 'knowing' responsibility of an object?

    <p>Knowing about private encapsulated data</p> Signup and view all the answers

    How many GRASP patterns are there?

    <p>9</p> Signup and view all the answers

    What is the primary purpose of GRASP patterns?

    <p>To develop a methodical approach to object design</p> Signup and view all the answers

    What is the relationship between responsibilities and behavior in an object?

    <p>Responsibilities are related to an object's behavior in terms of its obligations</p> Signup and view all the answers

    Who is credited with creating the GRASP acronym?

    <p>Craig Larman</p> Signup and view all the answers

    What is the focus of the four GRASP patterns to be presented?

    <p>Assigning responsibilities to classes</p> Signup and view all the answers

    What is the quote about the most likely way for the world to be destroyed?

    <p>By accident</p> Signup and view all the answers

    What is the definition of a responsibility in UML?

    <p>A contract or obligation of a classifier</p> Signup and view all the answers

    What is the primary goal of GRASP patterns in software design?

    <p>To help understand essential object design</p> Signup and view all the answers

    What is the significance of GRASP patterns in object design?

    <p>They are creative steps in the design process</p> Signup and view all the answers

    Study Notes

    GRASP Patterns

    • GRASP (General Responsibility Assignment Software Patterns) is an acronym created by Craig Larman to encompass nine object-oriented design principles related to creating responsibilities for classes.
    • GRASP patterns are a learning aid to help with fundamental object design and apply design reasoning in a methodical, rational, explainable way.

    Responsibilities

    • A responsibility is a contract or obligation of a classifier.
    • There are two types of responsibilities:
      • Doing responsibilities: include doing something itself, initiating action in other objects, and controlling and coordinating activities in other objects.
      • Knowing responsibilities: include knowing about private encapsulated data, knowing about related objects, and knowing about things it can derive or calculate.

    GRASP Patterns - Example

    • Pattern Name: Information Expert
    • Solution: Assign a responsibility to the class that has the information needed to fulfill it.
    • Problem it Solves: What is a basic principle by which to assign responsibilities to objects?

    GRASP Patterns

    • There are nine GRASP patterns:
      • Creator
      • Information Expert (or just Expert)
      • Low Coupling
      • Controller
      • High Cohesion
      • Polymorphism
      • Pure Fabrication
      • Indirection
      • Protected Variations

    GRASP Patterns - Creator

    • Pattern Name: Creator
    • Solution: Assign the responsibility of creating instances of a class to the class that has the most knowledge about when and how to create them.
    • Problem: Decide which class should be responsible for creating instances of a new bank account.

    GRASP Patterns - Information Expert (or just Expert)

    • Pattern Name: Information Expert
    • Solution: Assign a responsibility to the class that has the necessary information to fulfill it, promoting high cohesion and minimizing coupling.
    • Problem: Determine which class should be responsible for calculating interest on a bank account.

    GRASP Patterns - Low Coupling

    • Pattern Name: Low Coupling
    • Solution: Implement an Observer pattern to notify interested parties (e.g., GUI, Logging module) of changes in bank account balances without tightly coupling them to the BankAccount class.
    • Problem: Minimize dependencies between classes to allow for easier maintenance and modification.

    GRASP Patterns - Controller

    • Pattern Name: Controller
    • Solution: Assign the responsibility of handling system events or coordinating activities to a controller class.
    • Problem: Determine which class should handle the process of transferring funds between bank accounts.

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    Description

    Learn about GRASP patterns and their applications in software construction. Understand the importance of General Responsibility Assignment Software Patterns in software development.

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