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Questions and Answers
What is the main issue with the shape class hierarchy when trying to extend it to incorporate colors?
What is the main issue with the shape class hierarchy when trying to extend it to incorporate colors?
- Colors cannot be implemented using object composition
- Trying to extend the shape classes in two independent dimensions (correct)
- Inheritance is not suitable for geometric shapes
- The shape class is too large and complex
What is the purpose of the Bridge pattern?
What is the purpose of the Bridge pattern?
- To split a large class into two separate hierarchies (correct)
- To create a new class hierarchy for colors
- To implement the Singleton pattern
- To create a factory method for shapes
What is the result of adding new shape types and colors to the hierarchy without using the Bridge pattern?
What is the result of adding new shape types and colors to the hierarchy without using the Bridge pattern?
- The hierarchy becomes smaller
- The hierarchy remains the same size
- The hierarchy grows exponentially (correct)
- The hierarchy grows linearly
What is the relationship between the Shape class and the Color class in the Bridge pattern?
What is the relationship between the Shape class and the Color class in the Bridge pattern?
Which of the following is a benefit of using the Bridge pattern?
Which of the following is a benefit of using the Bridge pattern?
What is the term for the Shape class in the Bridge pattern?
What is the term for the Shape class in the Bridge pattern?
What is the term for the Color class in the Bridge pattern?
What is the term for the Color class in the Bridge pattern?
What design pattern is similar to the Bridge pattern in that it also uses object composition?
What design pattern is similar to the Bridge pattern in that it also uses object composition?
What is the disadvantage of using class inheritance to extend the shape class hierarchy?
What is the disadvantage of using class inheritance to extend the shape class hierarchy?
What is the main difference between the Bridge pattern and the Factory Method pattern?
What is the main difference between the Bridge pattern and the Factory Method pattern?
What is the primary purpose of the abstraction layer in the Bridge pattern?
What is the primary purpose of the abstraction layer in the Bridge pattern?
What is the result of not using the Bridge pattern in an application with multiple GUI and API combinations?
What is the result of not using the Bridge pattern in an application with multiple GUI and API combinations?
What is the benefit of using the Bridge pattern in terms of changing the GUI classes?
What is the benefit of using the Bridge pattern in terms of changing the GUI classes?
What is the common interface that enables different implementations to be interchangeable?
What is the common interface that enables different implementations to be interchangeable?
What is the main problem that the Bridge pattern solves in terms of adding support for a new operating system?
What is the main problem that the Bridge pattern solves in terms of adding support for a new operating system?
What is the term used to describe the high-level control layer for some entity in the Bridge pattern?
What is the term used to describe the high-level control layer for some entity in the Bridge pattern?
What is the benefit of using the Bridge pattern in terms of the complexity of the code?
What is the benefit of using the Bridge pattern in terms of the complexity of the code?
What is the alternative to the Bridge pattern that can lead to a giant spaghetti bowl of code?
What is the alternative to the Bridge pattern that can lead to a giant spaghetti bowl of code?
What is the main difference between the abstraction layer and the implementation layer in the Bridge pattern?
What is the main difference between the abstraction layer and the implementation layer in the Bridge pattern?
What is the relationship between the abstraction object and the linked implementation object in the Bridge pattern?
What is the relationship between the abstraction object and the linked implementation object in the Bridge pattern?
Why does the author think the terms 'abstraction' and 'interface' are problematic?
Why does the author think the terms 'abstraction' and 'interface' are problematic?
What is the primary role of the abstraction layer in the Bridge pattern?
What is the primary role of the abstraction layer in the Bridge pattern?
What is the result of not using the Bridge pattern in an application with multiple GUI and API combinations?
What is the result of not using the Bridge pattern in an application with multiple GUI and API combinations?
What is the advantage of dividing the classes into two hierarchies in the Bridge pattern?
What is the advantage of dividing the classes into two hierarchies in the Bridge pattern?
What is the role of the implementation layer in the Bridge pattern?
What is the role of the implementation layer in the Bridge pattern?
How does the Bridge pattern enable the same GUI to work under different operating systems?
How does the Bridge pattern enable the same GUI to work under different operating systems?
What is the disadvantage of having a giant spaghetti bowl of code?
What is the disadvantage of having a giant spaghetti bowl of code?
What is the benefit of using the Bridge pattern in terms of changing the GUI classes?
What is the benefit of using the Bridge pattern in terms of changing the GUI classes?
What is the common interface that enables different implementations to be interchangeable?
What is the common interface that enables different implementations to be interchangeable?
What is the result of adding support for a new operating system without using the Bridge pattern?
What is the result of adding support for a new operating system without using the Bridge pattern?
What is the primary reason for the exponential growth of the hierarchy when adding new shape types and colors?
What is the primary reason for the exponential growth of the hierarchy when adding new shape types and colors?
Which of the following is a characteristic of the implementation hierarchy in the Bridge pattern?
Which of the following is a characteristic of the implementation hierarchy in the Bridge pattern?
What is the role of the reference field in the Shape class in the Bridge pattern?
What is the role of the reference field in the Shape class in the Bridge pattern?
What is the main advantage of using object composition over inheritance in the Bridge pattern?
What is the main advantage of using object composition over inheritance in the Bridge pattern?
Which of the following is a consequence of not using the Bridge pattern in a system with multiple GUI and API combinations?
Which of the following is a consequence of not using the Bridge pattern in a system with multiple GUI and API combinations?
What is the main benefit of separating the abstraction and implementation hierarchies in the Bridge pattern?
What is the main benefit of separating the abstraction and implementation hierarchies in the Bridge pattern?
Which of the following is a characteristic of the abstraction hierarchy in the Bridge pattern?
Which of the following is a characteristic of the abstraction hierarchy in the Bridge pattern?
What is the main problem that the Bridge pattern solves in terms of adding support for a new operating system?
What is the main problem that the Bridge pattern solves in terms of adding support for a new operating system?
Which of the following is a benefit of using the Bridge pattern in terms of changing the GUI classes?
Which of the following is a benefit of using the Bridge pattern in terms of changing the GUI classes?
What is the relationship between the abstraction object and the linked implementation object in the Bridge pattern?
What is the relationship between the abstraction object and the linked implementation object in the Bridge pattern?
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Study Notes
Bridge Pattern
- The Bridge pattern allows you to split a large class or a set of closely related classes into two separate hierarchies: abstraction and implementation.
- This enables the two hierarchies to be developed independently of each other.
Problem with Class Inheritance
- Adding new shape types and colors to a hierarchy can lead to exponential growth, making it difficult to manage.
- For example, adding a triangle shape requires introducing two subclasses for each color, and adding a new color requires creating three subclasses for each shape type.
Solution
- The Bridge pattern solves this problem by switching from inheritance to object composition.
- It extracts one of the dimensions (e.g., color) into a separate class hierarchy, allowing the original classes to reference an object of the new hierarchy.
- This enables the original classes to delegate work to the linked object, rather than having all the state and behaviors within one class.
Abstraction and Implementation
- Abstraction (interface) is a high-level control layer that delegates work to the implementation layer (platform).
- Abstraction is not supposed to do any real work on its own.
- The implementation layer performs the actual work.
Real-World Example
- In a GUI application, the abstraction can be represented by the graphical user interface (GUI), and the implementation can be the underlying operating system code (API).
- The GUI layer calls the API in response to user interactions.
Benefits of the Bridge Pattern
- Enables extending the application in two independent directions.
- Allows for changing the GUI classes without touching the API-related classes.
- Enables adding support for another operating system by creating a subclass in the implementation hierarchy.
Bridge Pattern
- The Bridge pattern allows you to split a large class or a set of closely related classes into two separate hierarchies: abstraction and implementation.
- This enables the two hierarchies to be developed independently of each other.
Problem with Class Inheritance
- Adding new shape types and colors to a hierarchy can lead to exponential growth, making it difficult to manage.
- For example, adding a triangle shape requires introducing two subclasses for each color, and adding a new color requires creating three subclasses for each shape type.
Solution
- The Bridge pattern solves this problem by switching from inheritance to object composition.
- It extracts one of the dimensions (e.g., color) into a separate class hierarchy, allowing the original classes to reference an object of the new hierarchy.
- This enables the original classes to delegate work to the linked object, rather than having all the state and behaviors within one class.
Abstraction and Implementation
- Abstraction (interface) is a high-level control layer that delegates work to the implementation layer (platform).
- Abstraction is not supposed to do any real work on its own.
- The implementation layer performs the actual work.
Real-World Example
- In a GUI application, the abstraction can be represented by the graphical user interface (GUI), and the implementation can be the underlying operating system code (API).
- The GUI layer calls the API in response to user interactions.
Benefits of the Bridge Pattern
- Enables extending the application in two independent directions.
- Allows for changing the GUI classes without touching the API-related classes.
- Enables adding support for another operating system by creating a subclass in the implementation hierarchy.
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