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Multiplying 2 digits in TextField - Java FX

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I am struggling with a bug in my application. The general idea was to multiply base price by slider argument, for example if the slider is set to 2, price = 2 * price

The problem is that is if I switch the slider again, math operations are accumulating. For example when I switched slider to 2, then to 3, after that to 4, my result is price * 2 * 3 * 4, but my expectation is to have price * 4 remembered. How can I fix it?

daysSlider.valueProperty().addListener(new ChangeListener() {

    public void changed(ObservableValue arg0, Object arg1, Object arg2) {
      int i = Integer.parseInt(priceTextField.getText());
                String.valueOf((int) daysSlider.getValue()* i ));

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