In Java, how would you create a function which will ask the user to enter the type of each vehicle based on the number of vehicles (The number of vehicles has already been prompted of the user with {System.out.println("How many vehicles to wash?"); numberOfVehicles = input.nextInt();}. For each vehicle, the user should enter one of the following:

1= "Car" 2= "Truck" 3= "Van"

Using constants, set the cost to wash each car as $20 for a car, $25 for a truck, and $30 for a van. Ensure that each vehicle type is added to the allVehicles attribute.