Here is a step-by-step guide on how to create the abstract class Motor Vehicle and its subclass Car in Java:

Step 1: Declare the abstract class MotorVehicle with its data members and method.

```java
public abstract class MotorVehicle {
protected String modelName;
protected String modelNumber;
protected double price;

public MotorVehicle(String modelName, String modelNumber, double price) {
this.modelName = modelName;
this.modelNumber = modelNumber;
this.price = price;
}

public abstract void display();
}
```

Step 2: Declare the subclass Car that extends the MotorVehicle class. Add the new data member and methods.

```java
public class Car extends MotorVehicle {
private double discountRate;

public Car(String modelName, String modelNumber, double price, double discountRate) {
super(modelName, modelNumber, price);
this.discountRate = discountRate;
}

@Override
public void display() {
System.out.println("Model Name: " + modelName);
System.out.println("Model Number: " + modelNumber);
System.out.println("Price: " + price);
System.out.println("Discount Rate: " + discountRate);
}

public void discount() {
double discount = price * discountRate;
double priceAfterDiscount = price - discount;
System.out.println("Discount: " + discount);
System.out.println("Price after discount: " + priceAfterDiscount);
}
}
```

Step 3: Now you can create an object of the Car class and call its methods.

```java
public class Main {
public static void main(String[] args) {
Car car = new Car("Model1", "1234", 20000, 0.1);
car.display();
car.discount();
}
}
```

This program will first display the car details and then calculate and display the discount and the price after discount.

Question

Here is a step-by-step guide on how to create the abstract class Motor Vehicle and its subclass Car in Java:

Step 1: Declare the abstract class MotorVehicle with its data members and method.

```java
public abstract class MotorVehicle {
    protected String modelName;
    protected String modelNumber;
    protected double price;

public MotorVehicle(String modelName, String modelNumber, double price) {
        this.modelName = modelName;
        this.modelNumber = modelNumber;
        this.price = price;
    }

public abstract void display();
}
```

Step 2: Declare the subclass Car that extends the MotorVehicle class. Add the new data member and methods.

```java
public class Car extends MotorVehicle {
    private double discountRate;

public Car(String modelName, String modelNumber, double price, double discountRate) {
        super(modelName, modelNumber, price);
        this.discountRate = discountRate;
    }

@Override
    public void display() {
        System.out.println("Model Name: " + modelName);
        System.out.println("Model Number: " + modelNumber);
        System.out.println("Price: " + price);
        System.out.println("Discount Rate: " + discountRate);
    }

public void discount() {
        double discount = price * discountRate;
        double priceAfterDiscount = price - discount;
        System.out.println("Discount: " + discount);
        System.out.println("Price after discount: " + priceAfterDiscount);
    }
}
```

Step 3: Now you can create an object of the Car class and call its methods.

```java
public class Main {
    public static void main(String[] args) {
        Car car = new Car("Model1", "1234", 20000, 0.1);
        car.display();
        car.discount();
    }
}
```

This program will first display the car details and then calculate and display the discount and the price after discount.

Knowee AI · Accepted Answer