ABSTRACTION
Hey guys, today we
are back with another blog, so this far we have discussed the three pillars of
OOPS namely, inheritance, polymorphism, encapsulation but today we will be
discussing the last pillar of OOPs i.e., abstraction.
Suppose one day you
make an app for a client, and after few days that client comes back to you and
says that the app you made him has some bugs. You get that issue fixed in
couple of minutes and then start telling the details about why the app was not
working fine to your client, to this your client might get annoyed or might ask
to leave because he being a non-tech guy, why would you talk about the
technicalities of the app to him? So abstraction is kinda same thing, it gets
the work done without telling the user non- essential details.
So before diving
right into abstraction let us first discuss about the abstract keyword as well
as abstract methods and classes:
· So abstract keyword when used with classes make
abstract classes.
· Abstract classes can contain abstract methods but an abstract method must be in an
abstract class.
· Abstract methods are only methods names (or
methods without body ) and their implementation is written in their sub-classes
or in the classes in which they are inherited.
·
One cannot create objects out of abstract classes.
Now let's see the
example of abstraction in java.
abstract class Test{
public abstract void John();
public abstract void Hannah();
public void Lisa() {
System.out.println("Lisa scored highest in the Test");
}
}
class Rank extends Test {
public void John() {
System.out.println("John
scored third highest in the Test");
}
public void Hannah() {
System.out.println("Hannah
scored second highest in the Test ");
}
}
public class Coding_Winds {
public static void main(String[] args) {
Rank obj = new Rank();
obj.Lisa();
obj.Hannah();
obj.John();
}
}
Output:
Lisa scored highest in the Test
Hannah scored second highest in the Test
John scored third highest in the Test
So by
now you might be wondering that what could be the difference between
encapsulation and abstraction since both of them are used for data hiding. Well
considering the example at this beginning of the blog, you can learn that
abstraction is used to achieve more simpler program and make available only the
essential information . But encapsulation is used to make a part of the code
private or hidden from everyone for security reasons , basically it used for
data privacy and binds the code and data into single unit.
Abstraction
in java can also be achieved with Interfaces .
Hope you are clear on this topic do read our more articles on JAVA LANGUAGE.
If you still have any doubt on this topic then do come to us via email "sophomoretechs@gmail.com" or via Instagram "@coding.winds".
This article is SUBMITTED By : Pranjal Rai
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