SWE202: GRASP Patterns in Software Construction
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Questions and Answers

What is the primary goal of GRASP patterns?

  • To create obligations for classifiers
  • To document what expert designers know intuitively
  • To provide a methodical approach to learning basic object design (correct)
  • To avoid accidents in software development

    • What is the definition of a responsibility in the context of UML?

  • A principle of object-oriented design
  • A type of design pattern
  • A contract or obligation of a classifier (correct)
  • A classification of an object's behavior

    • What is the name of the person who created the GRASP acronym?

  • Oluwaseun Priscilla Olawale
  • Unknown
  • Craig Larman (correct)
  • Nathaniel Borenstein

    • What is the main focus of the GRASP patterns?

    <p>Creating responsibilities for classes</p> Signup and view all the answers

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

    <p>The role of computer professionals in causing accidents</p> Signup and view all the answers

    How many GRASP patterns are presented and discussed in the text?

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

    What is the significance of GRASP patterns in relation to object design?

    <p>They are a methodical approach to learning basic object design</p> Signup and view all the answers

    What is the primary objective of using GRASP patterns?

    <p>To understand and apply design principles</p> Signup and view all the answers

    What is the primary goal of the Low Coupling pattern?

    <p>To minimize dependencies between classes</p> Signup and view all the answers

    Which GRASP pattern is responsible for assigning responsibilities to classes based on the information they possess?

    <p>Information Expert</p> Signup and view all the answers

    What is the purpose of the Controller pattern?

    <p>To handle system events or coordinate activities</p> Signup and view all the answers

    Which class should be responsible for calculating interest on a bank account, according to the Information Expert pattern?

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

    What is the primary purpose of the Observer pattern in the context of GRASP patterns?

    <p>To notify interested parties of changes in bank account balances</p> Signup and view all the answers

    According to the Creator pattern, which class(es) should be responsible for creating instances of a new bank account?

    <p>Bank class or AccountManager class</p> Signup and view all the answers

    What is the primary goal of the High Cohesion principle?

    <p>To promote high cohesion and minimize coupling</p> Signup and view all the answers

    Which GRASP pattern is responsible for assigning responsibilities to classes based on their ability to handle system events or coordinate activities?

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

    What is the primary focus of the 'doing' responsibilities of an object?

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

    According to the GRASP pattern 'Information Expert', what is the primary consideration for assigning a responsibility to a class?

    <p>The class's possession of the information needed to fulfill the responsibility</p> Signup and view all the answers

    What type of pattern is the GRASP pattern 'Creator' an example of?

    <p>Creational pattern</p> Signup and view all the answers

    What is the primary difference between 'knowing' and 'doing' responsibilities?

    <p>Knowing is about private data, while doing is about initiating actions</p> Signup and view all the answers

    What is the purpose of a GRASP pattern?

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

    How many GRASP patterns are mentioned in the text?

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

    What is the primary principle of the GRASP pattern 'Controller'?

    <p>Assign a responsibility to the class that controls and coordinates activities</p> Signup and view all the answers

    What is the primary characteristic of a 'knowing' responsibility?

    <p>It involves knowing about private encapsulated data</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 talk about and methodically do fundamental object design.
    • The assignment of responsibilities and design of collaborations are very important and creative steps during design.

    Responsibilities

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

    GRASP Patterns (Examples)

    • Information Expert: Assign a responsibility to the class that has the information needed to fulfill it.
    • Creator: Assign the responsibility of creating instances of a class to the class that has the most knowledge about when and how to create them.
    • Low Coupling: Aims for classes to have minimal dependencies on each other, facilitating easier maintenance and flexibility in the system.
    • Controller: Assign the responsibility of handling system events or coordinating activities to a controller class.

    Other GRASP Patterns

    • High Cohesion: Promotes high cohesion within a class.
    • Polymorphism: Supports variation in behavior.
    • Pure Fabrication: Creates a new class that does not represent a real-world concept.
    • Indirection: Provides an intermediate object to reduce coupling between classes.
    • Protected Variations: Anticipates and protects against variations in the system.

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    Related Documents

    Week 12-13 -SWE202.pdf

    Description

    Learn about GRASP patterns and their application in software construction, including four key patterns. Understand the importance of responsible software development.

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