import java.util.Scanner;  

import java.lang.Math;  

public class ArmstsrongNumberExample  

{  

//function to check if the number is Armstrong or not  

static boolean isArmstrong(int n)   

{   

int temp, digits=0, last=0, sum=0;   

//assigning n into a temp variable  

temp=n;   

//loop execute until the condition becomes false  

while(temp>0)    

{   

temp = temp/10;   

digits++;   

}   

temp = n;   

while(temp>0)   

{   

//determines the last digit from the number      

last = temp % 10;   

//calculates the power of a number up to digit times and add the resultant to the sum variable  

sum +=  (Math.pow(last, digits));   

//removes the last digit   

temp = temp/10;   

}  

//compares the sum with n  

if(n==sum)   

//returns if sum and n are equal  

return true;      

//returns false if sum and n are not equal  

else return false;   

}   

//driver code  

public static void main(String args[])     

{     

int num;   

Scanner sc= new Scanner(System.in);  

System.out.print("Enter the limit: ");  

//reads the limit from the user  

num=sc.nextInt();  

System.out.println("Armstrong Number up to "+ num + " are: ");  

for(int i=0; i<=num; i++)  

//function calling  

if(isArmstrong(i))  

//prints the armstrong numbers  

System.out.print(i+ ", ");  

}   

}  

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Static Blank Final Variable In Java

In java, static blank final variable is a variable which is declared with final keyword but not initialised at declaration time. It can only be initialised in static block.

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Throw And Throws In Java

throw:

throw is used in re-throwing exception process or we can say that it is used to throw an exception object explicitly. It can take at most one argument which will be an exception object. Only unchecked exception can be thrown.
throws:

throws keyword is used to throw an exception object implicitly. The throws keyword is used with the method signature. We can declare more than one type of exceptions with method signature which should be comma separated.
Note:
1.     throws is commonly used to throw checked exception.
2.     If we are calling a method that declares an exception then we must have to either caught or declare the exception.
3.     Exception can be re-thrown.

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