Using predefined value
In this predefined program as you can see that i have already defined the value in InputNumber variable and the value is 3.

Code :
class Factorial
{
 public static void main(String args[])
 {
  int InputNumber=3,LoopVariable,Result=1;
  for (LoopVariable=1;LoopVariable<=InputNumber;LoopVariable++)
  {
   Result=Result*LoopVariable;
  }
  System.out.println("Factorial Result is: "+Result);
 }
}

Output :
Factorial is: 6
Using user input
Here you can see that i have used Scanner class to take the value from the user and calculate the factorial.

Code :
import java.util.Scanner;
class Factorial
{
 public static void main(String args[])
 {
  int InputNumber,LoopVariable,Result=1;
  Scanner ScannerObject = new Scanner(System.in);
  System.out.println("Enter a Positive Number To Calculate Its Factorial: ");
  InputNumber = ScannerObject.nextInt();
  for (LoopVariable=1;LoopVariable<=InputNumber;LoopVariable++)
  {
   Result=Result*LoopVariable;
  }
  System.out.println("Factorial Result is: "+Result);
 }
}

Output :
Enter a Positive Number To Calculate Its Factorial:
5
Factorial Result is: 120

IDE Used To Test This Code : Dr Java

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