How to print fibonacci series in java

import java.util.Scanner;

class Main{

public static void main(String args[]){

int i,n1=0,n2=1,n3;

Scanner input=new Scanner(System.in);

System.out.println("Enter the number");

int n=input.nextInt();

System.out.println("Fibonacci series is "+n1);

System.out.println("Fibonacci series is "+n2);

for(i=0;i<=n;i++)

{

n3=n1+n2;

System.out.println("Fibonacci series is "+n3);

n1=n2;

n2=n3;

}

}

}

OUTPUT:-

C:\Users\Satyendra\Desktop>javac Main.java

C:\Users\Satyendra\Desktop>java Main

Enter the number

10

Fibonacci series is 0

Fibonacci series is 1

Fibonacci series is 1

Fibonacci series is 2

Fibonacci series is 3

Fibonacci series is 5

Fibonacci series is 8

Fibonacci series is 13

Fibonacci series is 21

Fibonacci series is 34

Fibonacci series is 55

Fibonacci series is 89

Fibonacci series is 144

How to use final keyword in java

Final keyword:-If we use final before class then we cannot extend the class.

We cannot reuse the method by using final keyword.

class Test{

final void show()

{

System.out.println("Hello Friends");

}

}

class Main extends Test{

void show();

public static void main(String args[]){

final int x=10;

System.out.println("Before swapping :- "+x);

int y=20;

x=y;

System.out.println("After swapping :- "+x);

}

}

OUTPUT:-

Compile Time Error

How to create super keyword in java

Super keyword:- Super keyword is used for accessing super class methods and variables. And for calling super class constructors.

class A{

void show(int x){

System.out.println("Parent show");

}

}

class Main extends A{

void show(int x){

super.show(20);

System.out.println("Child show");

}

public static void main(String args[]){

Main m=new Main();

m.show(10);

}

}

OUTPUT:-

C:\Users\Satyendra\Desktop>javac main.java

C:\Users\Satyendra\Desktop>java Main

Parent show

Child show