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Abstraction.md

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date updated
2021-10-27 11:43

Topic: #oop #java_programming Tags: #review #pn_2_1 Links: [[Java]] [[Object-Oriented Programming]] Date Created: 17-10-21

Abstraction

Abstraction in few words

Abstraction in details

A good architecture allows major decisions to be deferred (Robert C. Martin, Clean Code)

In Java, stuff like [[Interfaces in Java]] are very good at providing a higher level of [[Abstraction]].

A good example of the usefulness of [[Abstraction]] in [[Object-Oriented Programming]] is the [[Collections in Java]] and [[Generics]] List

List<Integer> is = new ArrayList<>();
// List is an interface
// ArrayList is a class

In the [[Class]] hierarchy it sits ![[Pasted image 20211017122503.png]]

So this means we can create a [[Method]] that expects an [[Object]] List of a certain [[Type]] and we could give it both ArrayList and LinkedList without problems !

Interface vs Class

Prefer [[Inheritance]] of [[Interfaces in Java]] over [[Class]].

References