JAVA How to write an int into a file?

Question

I am supposed to create a file (done, it's called "factoriales.txt") and print in it the value of 10! (which is 3628800), the thing is, I can't seem to write the value into a file. I already know how to write text, but this wont work.... here's what I have so far. Please help!

    import java.io.File;
    import java.io.FileWriter;
    import java.io.IOException;

    public class D09T9e2
    {
        public static void main(String[] args)
        {
            try
            {
                File fac = new File("factoriales.txt");
                if (!fac.exists())
                {
                    fac.createNewFile();
                }
                System.out.println("The file has been created.");
                int r = 1;
                for (int i = 1; i<=10; i--)
                {
                    r = r * i;
                }
                FileWriter write = new FileWriter(fac);
                write.write(""+r);
                write.close();
            }
            catch (IOException e)
            {
                e.printStackTrace();
            }
        }
    }

---

Here's how I solved it thanks to everybody in here, I hope you like this simple method:

    import java.io.File;
    import java.io.FileWriter;
    import java.io.IOException;

    public class D09T9e2
    {
        public static void main(String[] args)
        {
            try
            {
                File fac = new File("factoriales.txt");
                if (!fac.exists())
                {
                    fac.createNewFile();
                }
                System.out.println("\n----------------------------------");
                System.out.println("The file has been created.");
                System.out.println("------------------------------------");
                int r = 1;
                FileWriter wr = new FileWriter(fac);
                for (int i = 1; i<=10; i++)
                {
                    r = r * i;
                    wr.write(r+System.getProperty( "line.separator" ));
                }               
                wr.close();
            }
            catch (IOException e)
            {
                e.printStackTrace();
            }
        }
    }

Solution 1

the reason any way is that

for (int i = 1; i<=10; i--)

runs to infinity since 1 cannot be reduced to 10

it should be

for (int i = 1; i<=10; i++)

and change data type to long as well

Solution 2

Change the for-loop:

From

 for (int i = 1; i<=10; i--)

to

 for (int i = 1; i<=10; i++)

and you will get the right result.

have a try and go ahead.

Solution 3

   public static void main(String[] args)
   {
       try
       {
           File fac = new File("c:\\bea\\factoriales.txt");
           if (!fac.exists())
           {
               fac.createNewFile();
           }
           System.out.println("The file has been created.");
           int r = 1;
           FileWriter write = new FileWriter(fac);
           write.write("");
           for (int i = 1; i<=10; i++)
           {
               r = r * i;
               write.append(r + "\n");
           }

           write.flush();
            write.close();
       }
       catch (IOException e)
       {
           e.printStackTrace();
       }
   }

Output:

1
2
6
24
120
720
5040
40320
362880
3628800