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What is the principle of composition over inheritance in object-oriented programming?
What is the principle of composition over inheritance in object-oriented programming?
The principle of composition over inheritance states that classes should favor polymorphic behavior and code reuse by containing instances of other classes that implement the desired functionality, rather than inheriting from a base or parent class.
How does an implementation of composition over inheritance typically begin?
How does an implementation of composition over inheritance typically begin?
An implementation typically begins with the creation of various interfaces representing the behaviors that the system must exhibit, which can facilitate polymorphic behavior.
What are the classes implementing the identified interfaces built and added to?
What are the classes implementing the identified interfaces built and added to?
The classes implementing the identified interfaces are built and added to business domain classes as needed.
How are alternative implementations of system behaviors accomplished in composition over inheritance?
How are alternative implementations of system behaviors accomplished in composition over inheritance?
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What can a class that contains a reference to an interface support?
What can a class that contains a reference to an interface support?
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Study Notes
Composition over Inheritance
- Composition over inheritance is a principle in object-oriented programming that recommends giving a class the ability to delegate to other objects rather than inheriting their behavior.
- This principle suggests that classes should be designed to contain instances of other classes or collections of objects, rather than inheriting from them.
Implementing Composition over Inheritance
- An implementation of composition over inheritance typically begins by identifying the interfaces that specify the behaviors required by a system.
- Interfaces are designed to define a contract that must be implemented by any class that wants to provide the specified behavior.
Building and Adding Classes
- Classes implementing the identified interfaces are built and added to a system, allowing for alternative implementations of system behaviors.
- These classes are typically designed to be self-contained and independent, making it easier to modify or replace them without affecting the rest of the system.
Alternative Implementations
- Alternative implementations of system behaviors are accomplished in composition over inheritance by creating multiple classes that implement the same interface.
- Each class provides a different implementation of the interface, allowing the system to use different behaviors depending on the context.
Class Capabilities
- A class that contains a reference to an interface can support different implementations of the interface, allowing for greater flexibility and modularity in a system.
- This allows the class to delegate to different objects that implement the interface, enabling the system to adapt to changing requirements and behaviors.
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Description
Test your understanding of the Composition over Inheritance principle in object-oriented programming with this quiz. Assess your knowledge of favoring polymorphic behavior and code reuse through composition, and learn about the benefits of this approach in OOP design.
