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What's the Difference Between Composition and Inheritance?

Sophia Al-Mansoor • • 6 min read
What's the Difference Between Composition and Inheritance?
Though both Inheritance and Composition provides code reusablility, main difference between Composition and Inheritance in Java is that Composition allows reuse of code without extending it but for Inheritance you must extend the class for any reuse of code or functionality.

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Similarly, you may ask, which one is better inheritance or composition?

1) One reason of favoring Composition over Inheritance in Java is fact that Java doesn't support multiple inheritance. 2) Composition offers better test-ability of a class than Inheritance. If one class is composed of another class, you can easily create Mock Object representing composed class for sake of testing.

Additionally, what is composition in object oriented programming? Composition is one of the fundamental concepts in object-oriented programming. It describes a class that references one or more objects of other classes in instance variables. This allows you to model a has-a association between objects. You can find such relationships quite regularly in the real world.

Correspondingly, what does composition over inheritance mean?

Composition over inheritance (or composite reuse principle) in object-oriented programming (OOP) is the principle that classes should achieve polymorphic behavior and code reuse by their composition (by containing instances of other classes that implement the desired functionality) rather than inheritance from a base

Is aggregation an inheritance?

Inheritance: extend the functionality of a class by creating a subclass. Override superclass members in the subclasses to provide new functionality. Aggregation: create new functionality by taking other classes and combining them into a new class.

Related Question Answers

Why inheritance is required?

One of the most important concepts in object-oriented programming is that of inheritance. Inheritance allows us to define a class in terms of another class, which makes it easier to create and maintain an application. This also provides an opportunity to reuse the code functionality and fast implementation time.

Where do we use inheritance?

Inheritance is a good choice when: Your inheritance hierarchy represents an "is-a" relationship and not a "has-a" relationship. You can reuse code from the base classes. You need to apply the same class and methods to different data types.
Sophia Al-Mansoor
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Sophia Al-Mansoor

Sophia analyzes international trade, startup ecosystems, retail transformation, and supply chain logistics for modern digital publications.