public abstract class Vehicle { private String description;// make-model for car

Question

public abstract class Vehicle {

    private String description;// make-model for cars/suvs, length for trucks
    private int mpg;// miles per gallon
    private String num_value;// (num of seats, bench seats, of rooms of storage)
    private String VIN;// unique vehicle identification number
    // reservation and cost information. When a vehicle is reserved, both reserv and cost are
    // assigned. When no reservation exists, both are equal to null.
   
    private Reservation reserv;// stores name, rental period, insur option, credit card # (for private customers)
                            // stores name, rental period, insur option, acct # (for corporate customers)
                           // assigned PrivateCustReservation or CorporationReservation type object

    private Cost cost; // Stores the rates in effect at the time reservation made, including daily_rate,
                      // weekly_rate, monthly_rate, per_mile_charge, and daily_insur_rate. Contains a
        // computeCost method using this information for when a vehicle is returned
      // and the actual time period used and the number of miles driven is known   
    // Note that these are the rates for a particular vehicle type, since “attached” to
   // a particular vehicle..

    public Vehicle(String des, int mpg, String num_value, String VIN) { //arg-constructor
        description = des;
        this.mpg = mpg;
        this.num_value = num_value;
        this.VIN = VIN;
        reserv = null; // init as “no reservation”
cost = null;
    }

    public String getDescription() {
        return description;
    }

    public int getMpg() {
        return mpg;
    }

    public String getNum_value() {
        return num_value;
    }

    public String getVIN() {//only getter needed
        return VIN;
    }

    public Reservation getReservation() {
        return reserv;
    }

    public void setReservation(Reservation resv) {
        this.reserv = reserv;
    }

    public Cost getCost() {
        return cost;
    }

    public void setCost(Cost cost) {
        this.cost = cost;
    }
   
    public abstract String toString();

    public boolean isReserved() {
        if (reserv != null) {
            return true;
        } else {
            return false;
        }
    }
    //Calculates cost of a returned vehicle
    public double calcCost(String time_unit, int num_time_units, int num_miles_driven) {
        // Calculates cost of a returned vehicle. Thus passed the ACTUAL time period vehicle used and
        // ACTUAL num miles driven. Uses its Reservation object to determine whether a company reservation
        // or private customer. Also uses the Reservation object to determine, if a company reservation,
        // whether the insurance is desired.

        // It in turn calls the calcCost method of the Cost object, since its Cost object has the rates appropriate
        // for this rental, which calculates and returns the total cost of the rental. The amount is then reduced
        // if this a company reservation, therefore receiving a 15% discount.
        // compute the total charge (before any discounts)
        double total_chrg = cost.calcCost(time_unit, num_time_units, num_miles_driven,
                reserv.insurance_selected());

        // apply any applicable discounts (check if Reservation object of type CompanyReservation)
        if (reserv instanceof CompanyReservation) {
            total_chrg = total_chrg * (100 - Rates.company_discount);
        }
        return total_chrg;
    }
}

complete java methods below

VVVVVVVVVVV

public class Vehicles {

    private Vehicle[] vehicles;
    private int current;

    public Vehicles() {
        current = 0;
        vehicles = new Vehicle[50];
    }

    public void add(Vehicle veh) {
      ...
    }

    public void remove(String VIN) {
       ...
     }
       
   
//iterartor methods

    public VehiclesIterator getAllVehiclesItr() {
        return new AllVehiclesIterator(0, vehicles);
    }

    public VehiclesIterator getAllUnreservedVehiclesItr() {
        return new AllUnreservedIterator(0, vehicles);
    }

    public void reset() {
       ...
    }

    public boolean hasNext() {
        if (current < (vehicles.length - 1)) {
            if (vehicles[current + 1] != null) {
                return true;
            }
        }
        return false;

    }

    public Vehicle next() {
        return vehicles[++current];
    }
}

Explanation / Answer

Please find my implementation.

Please let me know in case of any issue.

public class Vehicles {
private Vehicle[] vehicles;
private int current;
public Vehicles() {
current = 0;
vehicles = new Vehicle[50];
}
public void add(Vehicle veh) {
vehicles[current] = veh;
current++;
}
public void remove(String VIN) {

if(current == 0){

return;

}
int i = 0;
for(i=0; i<current; i++){
    if(vehicles[i].VIN.compareTo(VIN) == 0){
        break;
    }

    if(i == current-1){
        vehicles[i] == null;
        return;
    }

    for(int j=i; j<current-1; j++){
        vehicles[j] = vehicles[j+1];
    }
    vehicles[current-1] = null;
    current--;
}
}


//iterartor methods
public VehiclesIterator getAllVehiclesItr() {
return new AllVehiclesIterator(0, vehicles);
}
public VehiclesIterator getAllUnreservedVehiclesItr() {
return new AllUnreservedIterator(0, vehicles);
}
public void reset() {
...
}
public boolean hasNext() {
if (current < (vehicles.length - 1)) {
if (vehicles[current + 1] != null) {
return true;
}
}
return false;
}
public Vehicle next() {
return vehicles[++current];
}
}

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