factorial function wont work

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Java

Hi, I wanted to ask why my code will run with no errors but it wont give me a value either. Should i have a variable called total incase facNums value is being reset? what it needs to do is multiply each number until the loop hits the number put in so if 5 is put in the textbox it will go 1*2*3*4*5 and outputs the sum. Thanks guys

public void facbutton(eventhandler) {
    facnum = (Int.parseInt(string.valueOf(answerBox.getText())));
    if (facNum < 1) {
        MessageBox mb = new MessageBox (fr, "Facorial Error", "Cannot find the factorial of numbers less than 1.");
        mb.show();
    }
    else 
    {
        for (int i=(FacNum -1); i > 1; --i)
            FacNum *= i;
        answerBox.setText(string.valueOf(FacNum()));