Question

Write an inventory program in java for a used car lot. You should have one Car parent class and child classes for 3 vehicle types (convertible, SUV, Classic, etc). The parent class should have 3 variables and 3 functions, each child class should have 1 variable unique to it and 1 function. Your program should allow the user to store up to 100 cars in the inventory and write the cars out to a file when done.

Answer 1

PROGRAM CODE:

Car.java

package carinventory;

public class Car {

  

   private String plateNumber;

   private int numberOfSeats;

   private int numberOfDoors;

  

   Car(String number, int seats, int doors)

   {

       plateNumber = number;

       numberOfSeats = seats;

       numberOfDoors = doors;

   }

   public String getPlateNumber() {

       return plateNumber;

   }

   public int getNumberOfSeats() {

       return numberOfSeats;

   }

   public int getNumberOfDoors() {

       return numberOfDoors;

   }

  

   @Override

   public String toString() {

       return "Plate Number: " + plateNumber + " Seats: " + numberOfSeats + " Doors: " + numberOfDoors;

   }

}

Convertible.java

package carinventory;

public class Convertible extends Car{

   //to know if the convertible roof is automated or manual

   private boolean isAutomated;

  

   Convertible(String number, int seats, int doors, boolean automated) {

       super(number, seats, doors);

       this.isAutomated = automated;

   }

   public boolean getIsAutomated()

   {

       return isAutomated;

   }

  

   @Override

   public String toString() {

       return super.toString() + " Automated: " + isAutomated;

   }

}

Classic.java

package carinventory;

public class Classic extends Car{

   //To know if the classic car is more than 100 years old

   private boolean isAntique;

  

   Classic(String number, int seats, int doors, boolean antique) {

       super(number, seats, doors);

       this.isAntique = antique;

   }

  

   public boolean getIsAntique()

   {

       return isAntique;

   }

   @Override

   public String toString() {

       return super.toString() + " Antique: " + isAntique;

   }

}

SUV.java

package carinventory;

public class SUV extends Car{

  

   private boolean isCrossOver;

  

   SUV(String number, int seats, int doors, boolean crossOver) {

       super(number, seats, doors);

       this.isCrossOver = crossOver;

   }

   public boolean getIsCrossOver()

   {

       return isCrossOver;

   }

  

   @Override

   public String toString() {

      

       return super.toString() + " Cross over: " + isCrossOver;

   }

}

Inventory.java

package carinventory;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.PrintWriter;

public class Inventory {

  

   private Car cars[];

   private int size;

  

   public Inventory() {

       cars = new Car[100];

       size = 0;

   }

  

   public void addCar(Car car)

   {

       cars[size++] = car;

   }

  

   public void writeToFile(String fileName)

   {

       try {

           FileOutputStream out = new FileOutputStream(new File(fileName));

           PrintWriter writer = new PrintWriter(out);

           for(int i=0; i<size; i++)

           {

               writer.write(cars[i].toString() + "\n");

           }

           writer.close();

       } catch (FileNotFoundException e) {

           // TODO Auto-generated catch block

           e.printStackTrace();

       }

   }

}

carInventoryTester.java

package carinventory;

public class carInventoryTester {

   public static void main(String[] args) {

       Inventory carInventory = new Inventory();

       Car toyota = new SUV("TWS 234", 4, 4, true);

       Car classic = new Classic("QWS 345", 2, 2, true);

       Car convertible = new Convertible("TER 456", 4, 2, false);

      

       carInventory.addCar(toyota);

       carInventory.addCar(classic);

       carInventory.addCar(convertible);

      

       carInventory.writeToFile("Cars.txt");

   }

}

OUTPUT: