/** Represents a car.*/public class Car // TODO: Inherit from Vehicle{ // Do NOT add any instance variables public Car(double purchasePrice) { // TODO: Complete } // TODO: Override the getValue method ## Java Programming Example: Car and Vehicle Classes### CarTester.javaThis is a Java program that tests vehicle functionality.```javapublic class CarTester{ public static void main(String[] args) { Vehicle myCar = new Car(20000); System.out.println(myCar.getValue()); System.out.println("Expected: 20000.0"); myCar.move(10000); System.out.println(myCar.getValue()); System.out.println("Expected: 17500.0"); myCar.move(30000); System.out.println(myCar.getValue()); System.out.println("Expected: 10000.0"); myCar.move(40000); System.out.println(myCar.getValue()); System.out.println("Expected: 0.0"); myCar.move(10000); System.out.println(myCar.getValue()); System.out.println("Expected: 0.0"); }}```### Vehicle.javaThis class represents a vehicle's basic properties and behaviors.```java/** * Represents a vehicle of any type. */public class Vehicle{ private double value; private double mileage; public Vehicle(double aValue) { value = aValue; mileage = 0; } public void move(double milesMoved) { mileage = mileage + milesMoved; } public double getValue() { return value; } public double getMileage() { return mileage; }}```### ExplanationIn this example, there are two Java files:#### 1. CarTester.java- **Purpose**: Tests the functionality of a `Vehicle` (or `Car`) object.- **Functionality**: - Creates a new `Car` with an initial value of 20,000. - Prints the car's value and performs a series of movements, reducing the car's value each time. - Expects the car's value to be displayed and checked against expected values after each movement.#### 2. Vehicle.java- **Purpose**: Defines a generic vehicle with attributes such as `value` and `mileage`.- **Attributes**: - `value` (double): Initial worth of the vehicle. - `mileage` (double): Distance the vehicle has traveled.- **Methods**: - `move(double milesMoved)

Answered: /** Represents a car. */ public…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

/**
Represents a car.
*/
public class Car // TODO: Inherit from Vehicle
{
// Do NOT add any instance variables

public Car(double purchasePrice)
{
// TODO: Complete
}

// TODO: Override the getValue method

## Java Programming Example: Car and Vehicle Classes

### CarTester.java
This is a Java program that tests vehicle functionality.

```java
public class CarTester
{
public static void main(String[] args)
{
Vehicle myCar = new Car(20000);
System.out.println(myCar.getValue());
System.out.println("Expected: 20000.0");
myCar.move(10000);
System.out.println(myCar.getValue());
System.out.println("Expected: 17500.0");
myCar.move(30000);
System.out.println(myCar.getValue());
System.out.println("Expected: 10000.0");
myCar.move(40000);
System.out.println(myCar.getValue());
System.out.println("Expected: 0.0");
myCar.move(10000);
System.out.println(myCar.getValue());
System.out.println("Expected: 0.0");
}
}
```

### Vehicle.java
This class represents a vehicle's basic properties and behaviors.

```java
/**
* Represents a vehicle of any type.
*/

public class Vehicle
{
private double value;
private double mileage;

public Vehicle(double aValue)
{
value = aValue;
mileage = 0;
}

public void move(double milesMoved)
{
mileage = mileage + milesMoved;
}

public double getValue()
{
return value;
}

public double getMileage()
{
return mileage;
}
}
```

### Explanation

In this example, there are two Java files:

#### 1. CarTester.java
- **Purpose**: Tests the functionality of a `Vehicle` (or `Car`) object.
- **Functionality**:
- Creates a new `Car` with an initial value of 20,000.
- Prints the car's value and performs a series of movements, reducing the car's value each time.
- Expects the car's value to be displayed and checked against expected values after each movement.

#### 2. Vehicle.java
- **Purpose**: Defines a generic vehicle with attributes such as `value` and `mileage`.
- **Attributes**:
- `value` (double): Initial worth of the vehicle.
- `mileage` (double): Distance the vehicle has traveled.
- **Methods**:
- `move(double milesMoved)

Expert Solution

Step 1

Description:

In the constructor of Car class, call the superclass constructor with the purchasePrice as the argument.

In the getValue function, do the following:
- Initialize a variable.
- Set the value of the variable to super.getValue() - ((super.getMileage() / 10000) * 2500).
- If the value of the variable is less than 0, set its value to 0.0.
- Return the value of the variable.

Implementation of the Car class is given in the next step.

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