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I'm writing a program for an assignment that is supposed to output information about vehicles, where Vehicle is the Superclass and Car, Truck and Van are the Subclasses. Our instructor gave us the main method, so I know that issue has to be in the code I wrote for the Subclasses.

I have updated my code given the suggested feedback and have encountered a new error on line 3: No enclosing instance of type AssignmentEX2 is accessible. Must qualify the allocation with an enclosing instance of type AssignmentEX2 (e.g. x.new A() where x is an instance of AssignmentEX2).

public class AssignmentEX2 {

public static void main(String[] args) {
     Vehicle vehicle = new Vehicle("5554EAWV3898");
     System.out.println(vehicle.toString());
     vehicle.rentVehicle();
     System.out.println(vehicle.toString());
     vehicle.returnVehicle();
     System.out.println(vehicle.toString());
     System.out.println();

     Car car = new Car("6903NMME5853", 4);
     System.out.println(car.toString());
     car.rentVehicle();
     System.out.println(car.toString());
     System.out.println();

     Truck truck = new Truck("7242OAHT0021", 26, 3);
     System.out.println(truck.toString());
     truck.rentVehicle();
     System.out.println(truck.toString());
     System.out.println();

     Van van = new Van("5397NQRO4899", 11);
     System.out.println(van.toString());
     van.rentVehicle();
     System.out.println(van.toString());
    } 

class Vehicle {
    String vin;
    Boolean rented = false;

public Vehicle(String vin) {
}

public String getVin() {
    return vin;
}

public Boolean isRented() {
    return rented;
}

public void rentVehicle() {
    rented = true;
}

public void returnVehicle() {
    rented = false;
}

public String toString() {
    return("VIN: " + vin + "\nRented: " + rented );
}
}

class Car extends Vehicle {
    int doors;

    public Car (String vin, int doors) {
        super( vin );
    }

    public int getDoors() {
        return doors;
    }

    public String toString() {
        return("VIN: " + vin + "\nRented: " + rented + "\nDoors: " + doors);
    }

}

class Truck extends Vehicle {
    int boxSize;
    int axles;

    public Truck(String vin, int boxSize, int axles) {
        super( vin );
    }

    public int getBoxSize() {
        return boxSize;
    }

    public int getAxles() {
        return axles;
    }

    public String toString() {
        return("VIN: " + vin + "\nRented: " + rented + "\nBox Size: " + boxSize + "\nAxles: "
                + axles);
    }
}

class Van extends Vehicle {
    int seats;

    public Van (String vin, int seats) {
        super( vin );
    }

    public int getSeats() {
        return seats;
    }

    public String toString() {
        return("VIN: " + vin + "\nRented: " + rented + "\nSeats: " + seats);
    }
}

}

Kyle Joseph Green
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    *How* does this code not work? What error do you get? –  May 03 '15 at 14:52
  • Line 3: No enclosing instance of type AssignmentEX2 is accessible. Must qualify the allocation with an enclosing instance of type AssignmentEX2 (e.g. x.new A() where x is an instance of AssignmentEX2). – Kyle Joseph Green May 03 '15 at 15:20
  • @KyleJosephGreen Refer my answer now – Sagar Pudi May 03 '15 at 15:20
  • Got it. I closed the public class and got rid of the error. I have some run time errors now, but no compile errors. I'll do some research on those, though, and see if I can't figure out why they are occurring. – Kyle Joseph Green May 03 '15 at 15:27

2 Answers2

1

You seem to have put the subclasses as inner classes. I advise you to add a closing bracket '}' after the toString method in the Vehicle definition.

If not the classes will be Vehicle.Car instead of Car, Vehicle.Truck instead of Truck, etc...

FrankM
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  • When I try that, I get this error when I try to create new vehicle: No enclosing instance of type AssignmentEX2 is accessible. Must qualify the allocation with an enclosing instance of type AssignmentEX2 (e.g. x.new A() where x is an instance of AssignmentEX2). – Kyle Joseph Green May 03 '15 at 15:13
  • I believe you need to make Vehicle, Car, Truck, etc, static class instead of just class. That should get rid of the need for the outer class AssignmentEX2 to be instantiated before any inner classes can be. In java inner classes have access to the outer class instance (I belive with the key word outer). – FrankM May 03 '15 at 15:30
0

You've declared the class Vehicle as a non-static inner class. That means it must be associated with an instance of the AssignmentEX2 class.

 AssignmentEX2 assignmentEX2=new AssignmentEX2();
 Vehicle vehicle = assignmentEX2.new Vehicle("5554EAWV3898");

You have to write as below

Vehicle.Car car = vehicle.new Car("6903NMME5853", 4);

Vehicle.Truck truck= vehicle.new Truck("7242OAHT0021", 26, 3);

Vehicle.Van van = vehicle.new Van("5397NQRO4899", 11);

Note: Your subclasses are innerclasses of Vehicle.

Refer this SO question for clear understanding.

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Sagar Pudi
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