Exception Handling

Program to implement Exception Handling

import java.io.*;
public class ExceptionHandling {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        System.out.print("Enter Integer Number:: ");
        String s = br.readLine();
        int n, i, f = 1;
        try {
            n = Integer.parseInt(s);
            for (i = 1; i <= n; i++)
              f = f * i;
            System.out.println("\nFactorial of " + n + " is:: " + f);
        } catch (NumberFormatException e) {
            System.out.println("\nERROR!! Only integer value allowed");
        }
    }
}

OUTPUT::

Enter Integer Number:: 5.5

ERROR!! Only integer value allowed

NOTE:

Here, I have entered 5.5 as input, as it is not an integer it will throw NumberFormatException, which is caught by catch block and the statement in catch block will be executed.