Java Community | Help. Code. Learn.•6mo ago

Errors

What does it say and can you help me debug it ?

6 Replies

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reiwa•6mo ago

You need to make sure you have created a Java file named IAuto.java and defined the IAuto interface (public interface IAuto { ... }). Same problems with IElectricCar and IFuelCar. Similarly, the tesla and ford variables are being used as if they have already been declared and initialized, but no such declarations exist. Make sure you instantiate them: IAuto tesla = new Car("Tesla Model S");, for example.

OMIDDOP•6mo ago

import Model.ElectricModel;
import Model.FuelModel;

import Entities.ElectricCar;
import Entities.FuelCar;

public class Main {
    public static void main(String[] args) {
        // Create models
        ElectricModel teslaModel = new ElectricModel("Model 3", "Tesla", 2023, 75);
        FuelModel fordModel = new FuelModel("Focus", "Ford", 2022, 50, "Gasoline");

        // Create cars
        ElectricCar tesla = new ElectricCar(teslaModel);
        FuelCar ford = new FuelCar(fordModel);

        // Display car info
        System.out.println("=== ELECTRIC CAR ===");
        System.out.println(tesla);
        tesla.startEngine();
        tesla.charge();
        System.out.println("\nAfter charging:\n" + tesla);

        System.out.println("\n=== FUEL CAR ===");
        System.out.println(ford);
        ford.startEngine();
        ford.refuel();
        System.out.println("\nAfter refueling:\n" + ford);

        // Demonstrate LSP
        System.out.println("\n=== LSP DEMONSTRATION ===");
        IAuto[] vehicles = {tesla, ford};
        for (IAuto vehicle : vehicles) {
            System.out.println("\nVehicle: " + vehicle.getModel().getFullName());
            vehicle.startEngine();
            
            if (vehicle instanceof IElectricCar) {
                ((IElectricCar) vehicle).charge();
            }
            if (vehicle instanceof IFuelCar) {
                ((IFuelCar) vehicle).refuel();
            }
        }
    }
}

import Model.ElectricModel;
import Model.FuelModel;

import Entities.ElectricCar;
import Entities.FuelCar;

public class Main {
    public static void main(String[] args) {
        // Create models
        ElectricModel teslaModel = new ElectricModel("Model 3", "Tesla", 2023, 75);
        FuelModel fordModel = new FuelModel("Focus", "Ford", 2022, 50, "Gasoline");

        // Create cars
        ElectricCar tesla = new ElectricCar(teslaModel);
        FuelCar ford = new FuelCar(fordModel);

        // Display car info
        System.out.println("=== ELECTRIC CAR ===");
        System.out.println(tesla);
        tesla.startEngine();
        tesla.charge();
        System.out.println("\nAfter charging:\n" + tesla);

        System.out.println("\n=== FUEL CAR ===");
        System.out.println(ford);
        ford.startEngine();
        ford.refuel();
        System.out.println("\nAfter refueling:\n" + ford);

        // Demonstrate LSP
        System.out.println("\n=== LSP DEMONSTRATION ===");
        IAuto[] vehicles = {tesla, ford};
        for (IAuto vehicle : vehicles) {
            System.out.println("\nVehicle: " + vehicle.getModel().getFullName());
            vehicle.startEngine();
            
            if (vehicle instanceof IElectricCar) {
                ((IElectricCar) vehicle).charge();
            }
            if (vehicle instanceof IFuelCar) {
                ((IFuelCar) vehicle).refuel();
            }
        }
    }
}

this is it take a look if it is good! @reiwa

reiwa•6mo ago

are your Interfaces in a separate package? You may need to import the package, likepackage Interfaces; if the package is called 'Interfaces'.

OMIDDOP•6mo ago

i fixed it thnx i imported tthnx thnx

JavaBot•6mo ago

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