Podcast
Questions and Answers
What is the main motto of Object-Oriented Design (OOD) principles?
What is the main motto of Object-Oriented Design (OOD) principles?
- Divide and conquer.
- Practice makes perfect.
- Imitation is the sincerest form of not being stupid. (correct)
- Imitation is the sincerest form of flattery.
What is the primary goal of the Single Responsibility Principle (SRP)?
What is the primary goal of the Single Responsibility Principle (SRP)?
- To increase code complexity
- To make code more readable and maintainable (correct)
- To allow multiple reasons for change
- To decrease code extendability
What type of patterns deals with GUI design?
What type of patterns deals with GUI design?
- Database Patterns
- Concurrency Patterns
- Architectural Patterns
- GUI Design Patterns (correct)
What is an example of a Concurrency Pattern?
What is an example of a Concurrency Pattern?
What does ISP stand for in SOLID principles?
What does ISP stand for in SOLID principles?
What is an example of a GRASP pattern?
What is an example of a GRASP pattern?
What is an example of an Anti-pattern?
What is an example of an Anti-pattern?
How many essential elements are there in a design pattern?
How many essential elements are there in a design pattern?
What is the main benefit of following the Don't Repeat Yourself Principle?
What is the main benefit of following the Don't Repeat Yourself Principle?
What does the Acyclic Dependencies Principle aim to achieve in software design?
What does the Acyclic Dependencies Principle aim to achieve in software design?
Which type of design pattern is focused on the creation of objects?
Which type of design pattern is focused on the creation of objects?
Which principle favors polymorphic composition of objects over inheritance?
Which principle favors polymorphic composition of objects over inheritance?
What is the primary purpose of inheritance in object-oriented programming?
What is the primary purpose of inheritance in object-oriented programming?
What is the advantage of decoupling in software design?
What is the advantage of decoupling in software design?
What is the primary goal of the GRASP principles in object-oriented design?
What is the primary goal of the GRASP principles in object-oriented design?
Which of the following is NOT a GRASP principle?
Which of the following is NOT a GRASP principle?
Which principle is related to the idea of not forcing clients to depend on interfaces they don't use?
Which principle is related to the idea of not forcing clients to depend on interfaces they don't use?
What is the term for a graph with no cycles, as referred to in the Acyclic Dependencies Principle?
What is the term for a graph with no cycles, as referred to in the Acyclic Dependencies Principle?
What is the term for a design pattern that addresses a fundamental problem in software design?
What is the term for a design pattern that addresses a fundamental problem in software design?
Which of the following is NOT a type of design pattern based on the problem it addresses?
Which of the following is NOT a type of design pattern based on the problem it addresses?
What is the benefit of following the Composite Reuse Principle in software design?
What is the benefit of following the Composite Reuse Principle in software design?
Which of the following is an example of a class-level design pattern?
Which of the following is an example of a class-level design pattern?
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Study Notes
Design Patterns
- 5 essential elements of a pattern: pattern name, problem description, solution, consequences, and implementation
- Types of patterns:
- Architectural Patterns (e.g., MVC, Layers)
- GUI Design Patterns (e.g., Window per task, Disabled irrelevant things, Explorable interface)
- Database Patterns (e.g., decoupling patterns, resource patterns, cache patterns)
- Concurrency Patterns (e.g., Double buffering, Lock object, Producer-consumer, Asynchronous processing)
- Enterprise (J2EE) Patterns (e.g., Data Access Object, Data Transfer Object)
Design Principles
- OOD key principles: "Imitation is the sincerest form of not being stupid"
- Design Goals: code should be readable, extendable, modifiable, testable, and easy to refactor
- SOLID design principles:
- SRP (Single Responsibility Principle): a class should have one and only one reason to change
- OCP (Open-Closed Principle)
- LSP (Liskov Substitution Principle)
- ISP (Interface Segregation Principle)
- DIP (Dependency Inversion Principle)
Single Responsibility Principle (SRP)
- A class should have one and only one reason to change
- Code will be simpler and easier to maintain
- Example: Container and Iterator (Container manages objects; Iterator traverses the container)
- How to spot multiple responsibilities: forming sentences ending in itself
Don't Repeat Yourself (DRY)
- Avoid duplicate code by abstracting out things that are common and placing those things in a single location
- No duplicate code => ONE requirement in ONE place
- This principle can and should be applied everywhere (e.g., in Analysis phase – don't duplicate requirements or features)
Types of Design Patterns
- Based on the type of the problem it addresses (Purpose):
- Fundamental
- Creational
- Structural
- Behavioral
- Based on the technique it uses (Scope):
- Class (uses inheritance)
- Object (uses object composition)
Fundamental Patterns
- Inheritance: a mechanism that allows a class A to inherit members of a class B
- Acyclic dependencies principle: the dependency graph of packages or components should have no cycles
- Composite reuse principle: favor polymorphic composition of objects over inheritance
GRASP (General Responsibility Assignment Software Patterns)
- Guidelines for assigning responsibility to classes and objects in object-oriented design
- Includes patterns and principles such as:
- Controller
- Creator
- Indirection
- Information Expert
- High Cohesion
- Low Coupling
- Polymorphism
- Protected Variations
- Pure Fabrication
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