In Java,abstractioncaptures only those details about a class that are relevant to the current context.For example, ajava.util.Mapstores key-value pairs and exposes two methodsget()andput()to store and retrieve key-value pairs. This is, in fact, the only information we need if we want to...
2. Abstraction in Real Life When the object data is not visible to the outer world, it creates data abstraction. If needed, access to the Objects’ data is provided through some methods. We don’t need to provide details about all the functions of an object. When we hide the internal i...
public void turnOffCar() { System.out.println("turn off the manual car"); } @Override public String getCarType() { return this.carType; } } package com.journaldev.oops.abstraction; public class AutomaticCar implements Car { private String carType = "Automatic"; @Override public void turnO...
In simple terms, abstraction “displays” only the relevant attributes of objects and “hides” the unnecessary details. For example, when we are driving a car, we are only concerned about driving the car like start/stop the car, accelerate/ break, etc. ... This is a simple example of a...
When inheriting from an abstract class, all methods marked abstract in the parent's class declaration must be defined by the child; additionally, these methods must be defined with the same (or a less restricted)visibility. For example, if the abstract method is defined as protected, the func...
// inside the Amazon S3 adapter an instance of the S3Client is created. S3Client is part of the aws-sdkthis._client=newS3Client(); This method is particularly handy if you need to make API calls that are not implemented in this library. The example below shows how theCopyObjectCommand...
Example 1: Abstract Class abstractclassAnimal{abstractvoidmakeSound();voidsleep(){System.out.println("Sleeping...");}}classDogextendsAnimal{voidmakeSound(){System.out.println("Bark");}}publicclassAbstractClassExample{publicstaticvoidmain(String[]args){AnimalmyDog=newDog();myDog.makeSound();myDo...
In the Rectangle and Circle classes, data (width, height, radius) is encapsulated as private fields. The internal details of how the area is calculated (implementation of CalculateArea()) are encapsulated within each class. Conclusion In this example, abstraction enables the creation of a unified...
For this reason, the OOP abstraction layer must be black-boxed and the objects only used internally by the few engines present in the layer that have the responsibility to access the objects for specific abstracting reasons. In theDoofusesexample, I use the game objects exclusively to set their...
The process of focusing on the relevant details and ignoring the irrelevant details is called Abstraction. Abstraction is not an entirely new concept introduced by OOP. Structured Programming also supported abstraction with the help of data structures and functions. For example, one need not know the...