Get Factorial using Java

/*
 

import java.util.Scanner;

/**
 *
 * @author mohamed
 */
public class Factor {
    
    /** Creates a new instance of GCD */
    public Factor() {
        System.out.println("Factorial of number x!  ");
        Scanner inscan=new Scanner(System.in);
        System.out.println("Please enter the  number ");
        a=inscan.nextInt();

System.out.println("("+a+") ! = "+get_Factor() );
    }
    public long get_Factor()
    {
         if(a<1)return 1;
        long result=1;
        long x=a;
        while(x>1)
        {
            result*=x; 
                     
           x--;
        }
        return result;
    }
    
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        new Factor();
        // TODO code application logic here
    }
    
   private int a;
  
   
}