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What Is Abstraction Inwards Java? Abstract Class Or Interface

What is abstraction?

Abstraction inwards Java or Object oriented programming is a agency to segregate implementation from an interface in addition to 1 of the v fundamentals along amongst Encapsulation, Inheritance, Polymorphism, Class, and Object.  Abstraction inwards Java is achieved by  using interface in addition to abstract class inwards Java. An interface or abstract class is something which is non concrete , something which is incomplete. In social club to role interface or abstract class, nosotros involve to extend in addition to implement an abstract method amongst concrete behavior. One illustration of Abstraction is creating interface to announce mutual behaviour without specifying whatever details near how that behaviour plant e.g. You exercise an interface called Server which has the start() and stop() method. This is called abstraction of Server because every server should accept a agency to root in addition to halt in addition to details may differ. 


As I said before Abstraction inwards Java is implemented using abstract class in addition to interface equally discussed inwards side past times side section. In fact, what is an abstraction inwards Java, difference betwixt Abstraction in addition to Encapsulation  is besides a really pop pith Java interview because rigid OOPS science is 1 of the primary requirement for Java developers. Abstraction is besides 1 of the difficult to original concept. Programmer frequently mix differnet levels of abstraction which outcome inwards in-flexible code, in addition to thence hold upwards careful amongst that.

What is abstract class inwards Java

An abstract class is something which is incomplete in addition to you lot tin non exercise an lawsuit of the abstract class. If you lot desire to role it you lot involve to arrive consummate or concrete past times extending it. Influenza A virus subtype H5N1 class is called concrete if it does non incorporate whatever abstract method in addition to implements all abstract method inherited from abstract class or interface it has implemented or extended. By the agency Java has a concept of abstract classes, abstract method but a variable tin non hold upwards abstract inwards Java.

Influenza A virus subtype H5N1 pop illustration of abstract class inwards Java is ActionListener which has an abstract method called actionPerformed(ActionEvent ae). This method is called when an ActionEvent is fired similar when you lot click on JButton. It's mutual inwards coffee to attach ActionListener with JButton by implementing abstract method actionPerformed(ActionEvent ae) using Anonymous class, equally shown inwards below Example :

JButton  ok = new JButton("OK"); ok.addActionListener(new ActionListener(){            public void  actionPerformed(ActionEvent ae){                //code to grip event            } });

An abstract method inwards Java doesn't accept the torso , it's merely a declaration. In social club to role an abstract method, you lot involve to override that method inwards sub class.

in addition to thence when exercise you lot role abstraction ? ( most of import inwards my stance )

when you lot know something needs to hold upwards in that place but non certain how just it should hold off like. e.g. when I am creating a class called Vehicle, I know in that place should hold upwards methods similar start() in addition to stop() but don't know how that root in addition to halt method should work, because every vehicle tin accept dissimilar root in addition to halt machinery e..g merely about tin hold upwards started past times kicking or merely about tin hold upwards past times pressing buttons . The Same concept applies to interface inwards Java equally well, which nosotros volition hash out inwards merely about other post.

So the implementation of those start() in addition to stop() methods should hold upwards left to their concrete implementation e.g. Scooter, MotorBike , Car etc. See Head First Object Oriented Analysis in addition to Design for to a greater extent than details on when to role to role Abstraction inwards object oriented programming.

Abstraction Using Interface inwards Java

design amend Java application, you lot tin cash inwards one's chips for coffee interface if you lot alone know the mention of methods your class should accept e.g. for Server it should accept start() in addition to stop() method but nosotros don't know how just these root in addition to halt method volition work. 

If you lot know merely about of the behaviour piece designing class in addition to that would stay mutual across all subclasses add together that into an abstract class. An interface similar Runnable interface is a skilful illustration of abstraction inwards Java which is used to abstract chore executed past times multiple threads. Callable is merely about other skilful abstract of a chore which tin render value. 

Influenza A virus subtype H5N1 moving painting is worth to a greater extent than than 100 words in addition to this moving painting proves that. It nicely explanis the concept of information abstraction inwards object oriented programming world:

Abstraction : Things to Remember

1) Use abstraction if you lot know something needs to hold upwards inwards class but the implementation of that varies. Abstraction is truly resulting of idea procedure in addition to it truly involve skilful sense of both domain in addition to Object oriented analysis in addition to pattern to come upwards up amongst skilful abstraction for your project.

2) In Java, you lot tin non exercise an lawsuit of the abstract class using the novel operator, its compiler error. Though abstract class tin accept a constructor.

3) abstract is a keyword inwards Java, which tin hold upwards used amongst both class in addition to method.  Abstract class tin incorporate both abstract in addition to concrete method. An abstract method doesn't accept the body, merely declaration.

4) A class automatically becomes abstract class when whatever of its methods declared equally abstract.

5) abstract method doesn't accept method body.

6) In Java, a variable tin non hold upwards made abstract , its alone class or methods which would hold upwards abstract.

7) If a class extends an abstract class or interface it has to supply implementation to all its abstract method to hold upwards a concrete class. alternatively, this class tin besides hold upwards abstract.

Further Learning
Top 10 Object oriented pattern principles Java programmer should know

Top twenty pattern pattern interview questions inwards Java

What is Factory method pattern inwards Java

What is Decorate pattern inwards Java

What is Encapsulation inwards Java

What is Class inwards Java programming linguistic communication

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