Java: Sorting integer digits from greatest to least

I need help sorting the integer digits from greatest to least using if-statements only WITHOUT using String/Arrays or anything of the sort. Assume I have already initialized and imported Scanner and keyboard to allow for input. The issue I'm having is with the if-statements as I cannot seem to get it right. Please help, I have been trying to work on this for the last 5 hours. Thanks :)

    System.out.print("Enter a five digit integer number: ");

    int fiveInt, digit1, digit2, digit3, digit4, digit5; //Declaring variables

    Scanner keyboard = new Scanner (System.in);

    fiveInt = keyboard.nextInt(); //User input will be required



    System.out.println(" "); //Prints empty line


    //The following will be explained assuming number entered was 12345.
    //The (int) will change whatever result of the division taking place to an integer.

    digit1 = (int)(fiveInt / 10000); //12345 divided by 10000 = 1.2345 converted to 1 due to (int).
    digit2 = ((int)(fiveInt / 1000)) - (digit1 * 10); //12345 divided by 1000 = 12.345 - (1 * 10) = 2.345 converted 2 due to (int).
    digit3 = ((int)(fiveInt / 100)) - (digit1 * 100) - (digit2 * 10); //12345 divided by 100 = 123.45 - (1*100) - (2*10) = 3.45 converted to 3 due to (int).
    digit4 = ((int)(fiveInt / 10)) - (digit1 * 1000) - (digit2 * 100) - (digit3 * 10); //12345 divided by 10 = 1234.5 - (1*1000) - (2*100) - (3*10) = 4.5 converted to 4 due to (int).
    digit5 = fiveInt - (digit1 * 10000) - (digit2 * 1000) - (digit3 * 100) - (digit4 * 10); //12345 - (1*10000) - (2*1000) - (3*100) - (4*10) = 5



    System.out.println("The digits in " + fiveInt + " are: " + digit1 + ", " + digit2 + ", " + digit3 + ", " + digit4 + ", " + digit5);

    System.out.println(" "); //Prints empty line




    //Insert explanation for lines of code below here.



    if(digit1 < digit2){
      int a = digit1;
      digit1 = digit2;
      digit2 = digit1;
    }

    if(digit1 < digit3){
      int b = digit1;
      digit1 = digit3;
      digit3 = digit1;
    }

    if(digit1 < digit4){
      int c = digit1;
      digit1 = digit4;
      digit4 = digit1;
    }

    if(digit1 < digit5){
      int d = digit1;
      digit1 = digit5;
      digit5 = digit1;
    }




    //Insert explanation for lines of code above here.





    System.out.print("The largest number with these digits is: " + digit1 + digit2 + digit3 + digit4 + digit5); //Displays the digits in their sorted mann