Please remind yourself
how code tags work; I have added them for you this time, otherwise that code would have been illegible.
Why are you using Option Pane for keyboard input? That is very old‑fashioned style.
Why are all your methods marked static?
Why are you multiplying by 1.5 and then casting to an
int in line 148?
How do you think you should record the amount paid in the parking machine? Do you simply want a running total of what has been paid?