Write java code to calculate factorial of any given number

import java.io.*;
class Factorial
{
public static void main(String args[]) throws IOException
{
int num,f=1;
System.out.println("Enter a number");
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
num=Integer.parseInt(br.readLine());
if(num==0)
{
System.out.println("Factorial of 0 is: 1");
}
else
{
for(int i=num;i>0;i--)
{
f=f*i;
}
System.out.println("Factorial of "+num+" is: "+f);
}
}
}