Using Dr Java

Objective:

Write a class that represents a person in a simple way

First download the driver and put it in your project

DO NOT ALTER THE DRIVER!

Write a class file called Vehicle

Some of the attributes are

Manufacturers name Number of Cylinders (must be greater than 0) Owners name

Create the following Constructors

Default sets everything to default values Parameterized Constructor

Check for valid values

Accessors and Mutators for each variable

MAKE SURE THE MUTATORS CHECK FOR VALID VALUES!

Create the following Methods

equals takes in another instance of a Vehicle and returns true only if the names and the number of cylinders are equal toString returns a String that contains the Manufacturers name, number of cylinders, and the owners name

Write another class Truck which is a Vehicle

Some of the attributes of Truck are

Load capacity: a nonnegative number of tons represented by a decimal number Towing capacity: a nonnegative number of tons represented by a decimal

Create the following constructors

Default sets everything to default values

This includes calling the Vehicles default constructor

Parameterized Constructor

This must also take in via parameter the manufacturers name, number of cylinders, and the owners name in addition to the load and towing capacity.

Accessors and Mutators for each variable

MAKE SURE THE MUTATORS CHECK FOR VALID VALUES!

Create the following methods

equals This should override the vehicles equals method return true if all the properties of vehicle and truck are equal toString This should also override the vehicles toString method and also return the Vehicles toString along with the towing and load capacity

Write another class Car which is a Vehicle

Some of the attributes of Truck are

Gas Mileage: a nonnegative number of gallons represented by a decimal number Number of passengers: a nonnegative number of passengers represented by a whole number

Create the following constructors

Default sets everything to default values

This includes calling the Vehicles default constructor

Parameterized Constructor

This must also take in via parameter the manufacturers name, number of cylinders, and the owners name in addition to the load and towing capacity.

Accessors and Mutators for each variable

MAKE SURE THE MUTATORS CHECK FOR VALID VALUES!

Create the following methods

equals This should override the vehicles equals method return true if all the properties of vehicle and car are equal toString This should also override the vehicles toString method and also return the Vehicles toString along with the gas mileage and number of passengers

The Driver

import java.util.Scanner;

//A class that keeps a fleet of different types of vehicles

public class FleetOfVehicles {

//An array of vehicles

private Vehicle[] fleet;

public static final int MAX_VEHICLES = 100;

public FleetOfVehicles()

{

fleet = new Vehicle[MAX_VEHICLES];

}

public Vehicle[] getFleet()

{

return this.fleet;

}

//Adds a new vehicle to the first empty spot in the fleet array

public void addVehicle(Vehicle aV)

{

for(int i=0;i

{

if(fleet[i] == null)

{

fleet[i] = aV;

return;

}

}

//If it reaches here the array is full

System.out.println("The fleet of vehicles is full!");

}

//Removes a vehicle. It searches through the array for a vehicle that is equal to

//the parameter and once it is found that value is set to null

public void removeVehicle(Vehicle aV)

{

for(int i=0;i

{

if(fleet[i] != null && fleet[i].equals(aV))

{

fleet[i] = null;

return;

}

}

//If it reaches here then the vehicle was not found

System.out.println("The vehicle was not found");

}

//A static keyboard to be used throughout the frontend

static Scanner keyboard;

//Entry point of the program

public static void main(String[] args)

{

keyboard = new Scanner(System.in);//Construct the keyboard

System.out.println("Welcome to the fleet manager");

FleetOfVehicles fOfV = new FleetOfVehicles();//Creates a new instance of the FleetOfVehicles to be used

boolean quit = false;

while(!quit)//Runs until the user quits

{

printOptions();

int pick = keyboard.nextInt();

keyboard.nextLine();

switch(pick)

{

case 1: //Add vehicle

fOfV.addVehicle(makeAVehicleDialog());

break;

case 2: //Remove vehicle

fOfV.removeVehicle(makeAVehicleDialog());

break;

case 9:

quit = true;

break;

default:

System.out.println("Invalid input");

}

System.out.println("The Fleet currently");

printFleet(fOfV);

}

System.out.println("Goodbye");

}

//Displays the options to the user

public static void printOptions()

{

System.out.println("Enter 1: to add a Vehicle Enter 2: to remove a Vehicle Enter 9 to quit");

}

//Returns an instance of a vehicle based on user input

public static Vehicle makeAVehicleDialog()

{

Vehicle retV;

int pick = 0;

System.out.println("Enter 1: if it is a car Enter 2: if it is a truck Enter 3: if it is unclassified");

pick = keyboard.nextInt();

keyboard.nextLine();

while(pick != 1 && pick != 2 && pick != 3)

{

System.out.println("Invalid choice pick again");

pick = keyboard.nextInt();

keyboard.nextLine();

}

System.out.println("Enter the manufacturer's name");

String manuName = keyboard.nextLine();

System.out.println("Enter the number of cylinders");

int cylinders = keyboard.nextInt();

keyboard.nextLine();

System.out.println("Enter the owner's name");

String ownersName = keyboard.nextLine();

switch(pick)

{

case 1://Constructing a car

System.out.println("Enter the car's gas mileage");

double mileage = keyboard.nextDouble();

keyboard.nextLine();

System.out.println("Enter the number of passengers");

int passengers = keyboard.nextInt();

keyboard.nextLine();

retV = new Car(manuName,cylinders,ownersName,mileage,passengers);

break;

case 2://Constructing a truck

System.out.println("Enter the truck's load capacity");

double loadCap = keyboard.nextDouble();

keyboard.nextLine();

System.out.println("Enter the truck's towing capacity");

double towCap = keyboard.nextDouble();

keyboard.nextLine();

retV = new Truck(manuName,cylinders,ownersName,loadCap,towCap);

break;

default:

retV = new Vehicle(manuName,cylinders,ownersName);

}

return retV;

}

public static void printFleet(FleetOfVehicles fV)

{

for(Vehicle v : fV.getFleet())

{

if(v == null)

continue;

System.out.println(v);

System.out.println();

}

}

}

Example Dialog:

Welcome to the fleet manager

Enter 1: to add a Vehicle

Enter 2: to remove a Vehicle

Enter 9 to quit

1

Enter 1: if it is a car

Enter 2: if it is a truck

Enter 3: if it is unclassified

1

Enter the manufacturer's name

Nissan

Enter the number of cylinders

6

Enter the owner's name

JJ

Enter the car's gas mileage

29

Enter the number of passengers

5

The Fleet currently

Manufacturer's Name: Nissan

Number Of Cylinders: 6

Owner's Name: JJ

Gas Mileage: 29.0

Number of Passengers: 5

Enter 1: to add a Vehicle

Enter 2: to remove a Vehicle

Enter 9 to quit

1

Enter 1: if it is a car

Enter 2: if it is a truck

Enter 3: if it is unclassified

2

Enter the manufacturer's name

Chevy

Enter the number of cylinders

8

Enter the owner's name

Eddie

Enter the truck's load capacity

1

Enter the truck's towing capacity

2

The Fleet currently

Manufacturer's Name: Nissan

Number Of Cylinders: 6

Owner's Name: JJ

Gas Mileage: 29.0

Number of Passengers: 5

Manufacturer's Name: Chevy

Number Of Cylinders: 8

Owner's Name: Eddie

Towing Capacity: 2.0

Load Capacity: 1.0

Enter 1: to add a Vehicle

Enter 2: to remove a Vehicle

Enter 9 to quit

1

Enter 1: if it is a car

Enter 2: if it is a truck

Enter 3: if it is unclassified

3

Enter the manufacturer's name

Ford

Enter the number of cylinders

6

Enter the owner's name

Bob

The Fleet currently

Manufacturer's Name: Nissan

Number Of Cylinders: 6

Owner's Name: JJ

Gas Mileage: 29.0

Number of Passengers: 5

Manufacturer's Name: Chevy

Number Of Cylinders: 8

Owner's Name: Eddie

Towing Capacity: 2.0

Load Capacity: 1.0

Manufacturer's Name: Ford

Number Of Cylinders: 6

Owner's Name: Bob

Enter 1: to add a Vehicle

Enter 2: to remove a Vehicle

Enter 9 to quit

2

Enter 1: if it is a car

Enter 2: if it is a truck

Enter 3: if it is unclassified

2

Enter the manufacturer's name

Chevy

Enter the number of cylinders

8

Enter the owner's name

Eddie

Enter the truck's load capacity

1

Enter the truck's towing capacity

2

The Fleet currently

Manufacturer's Name: Nissan

Number Of Cylinders: 6

Owner's Name: JJ

Gas Mileage: 29.0

Number of Passengers: 5

Manufacturer's Name: Ford

Number Of Cylinders: 6

Owner's Name: Bob

Enter 1: to add a Vehicle

Enter 2: to remove a Vehicle

Enter 9 to quit

9

The Fleet currently

Manufacturer's Name: Nissan

Number Of Cylinders: 6

Owner's Name: JJ

Gas Mileage: 29.0

Number of Passengers: 5

Manufacturer's Name: Ford

Number Of Cylinders: 6

Owner's Name: Bob

Goodbye