Скачать или смотреть #71 What is Annotation in Java

Check out our courses:

Java Spring Boot AI Live Course: https://go.telusko.com/JavaSpringBootAI
Coupon: TELUSKO20 (20% Discount)

AI Powered DevOps with AWS - Live Course :- https://go.telusko.com/AIDevOps-AWS
Coupon: TELUSKO20 (20% Discount)

Master Java Spring Development : https://go.telusko.com/masterjava
Coupon: TELUSKO20 (20% Discount)

For More Queries WhatsApp or Call on : +919008963671

website : https://courses.telusko.com/


Udemy Courses:

Spring: https://go.telusko.com/udemyteluskosp...
Java:- https://go.telusko.com/udemyteluskojava
Java Spring:- https://go.telusko.com/Udemyjavaspring
Java For Programmers:- https://go.telusko.com/javaProgrammers
Python : https://go.telusko.com/udemyteluskopy...
Git : https://go.telusko.com/udemyteluskogit
Docker : https://go.telusko.com/udemyteluskodo...

Instagram :   / navinreddyofficial  
Linkedin :   / navinreddy20  
TELUSKO Android App : https://go.telusko.com/TELUSKOAPP
TELUSKO IOS App : https://apple.co/3SsgmU2
Discord :   / discord  

In this lecture we are discussing:
#1 What is Annotations?
#2 What does annotations provide to program?
#3 How annotation prevent us from logical error?


1)
What is Annotations?
-- annotation is type of comment which is used to provide meta data to the compiler and JVM about the program.

Basic difference between comment and annotations
-- annotation is used to provide meta data to the compiler and JVM about the program but comment is used to provide information to the programmer.

2)
What does annotations provide to program and what does for program?
-- Annotations are used to provide supplemental information about a program.
-- Annotations start with ‘@’.
-- Annotations do not change the action of a compiled program.
-- Annotations help to associate metadata (information) to the program elements i.e. instance variables, constructors, methods, classes, etc.
-- Annotations are not pure comments as they can change the way a program is treated by the compiler. See below code for example.

3)
How annotation prevent us from logical error?
class A{
public void show(){
System.out.println("In A");
}

public void display(){
System.out.println("In A");
}
}

class B extends A{
@Override
public void show(){
System.out.println("In B");
}
/* @Override
public void displayData(){
System.out.println("In B");
}
*/

//here you get error because you are not overriding the method of parent class but you are using @Override annotation
// if you are thinking I can override display() method but you should defined new method but whenever you mention @override compiler throw error that you are not override the parent class method
//it helps to avoid the logical error in the program because logical error is more difficult to find when you use annotation it helps to find the logical error
//because solving problem at compile time error is easy than solving problem at runtime


}

Github repo : https://github.com/navinreddy20/Javac...

More Learning :

Java :- https://bit.ly/3x6rr0N
Python :- https://bit.ly/3GRc7JX
Django :- https://bit.ly/3MmoJK6

JavaScript :- https://bit.ly/3tiAlHo
Node JS :- https://bit.ly/3GT4liq

Rest Api :-https://bit.ly/3MjhZwt
Servlet :- https://bit.ly/3Q7eA7k
Spring Framework :- https://bit.ly/3xi7buh
Design Patterns in Java :- https://bit.ly/3MocXiq
Docker :- https://bit.ly/3xjWzLA

Blockchain Tutorial :- https://bit.ly/3NSbOkc
Corda Tutorial:- https://bit.ly/3thbUKa
Hyperledger Fabric :- https://bit.ly/38RZCRB

NoSQL Tutorial :- https://bit.ly/3aJpRuc
Mysql Tutorial :- https://bit.ly/3thpr4L

Data Structures using Java :- https://bit.ly/3MuJa7S
Git Tutorial :- https://bit.ly/3NXyCPu

Donation:
PayPal Id : navinreddy20
https://www.telusko.com