How do I prompt an alert in Java if I am using a try and catch block? I am also using scene builder for the GUI side of things.

private boolean validateInput() { try{ double dPrice = Double.parseDouble (addPartPrice.getText()); } catch (Number FormatException | NullPointerException nfe) { return false; try{ int iStock = Integer.parseInt(addPartInventory.getText()); } catch (Number FormatException | NullPointerException nfe) { return false; tryd int iMin = Integer.parseInt(addPartMin.getText()); } catch (Number FormatException | NullPointerException nfe) { return false; try{ int iMax = Integer.parseInt(addPartMax.getText()); } catch (Number FormatException | NullPointerException nfe) { return false; if(!partIsoutsourcedFromCompany) { try{ int iID = Integer.parseInt(addPart Source.getText()); } catch (Number FormatException | NullPointerException nfe) { return false; return addPartName.getText() != null && addPartSource.getText() != null && Integer.parseInt(addPartMin.getText()) >= 0 && Integer.parseInt(addPartMin.getText()) = 0