Question

1. Write a class to represent a AlternativeEnergyCar. Select the fields and methods that fit the modeling of an alternative energy car. Make sure to include code for the constructors, set/get methods, a toString() method.

2. Inheritance – : For this question submit a UML as the answer.

Create two abstract subclasses of AECar, one for Electric cars and one for Altfuel cars. Next create four additional subclasses., two for types of Electric cars and two for Altfuel cars( for example, Altfuel cars might be Hydrogen powered or Biofuel powered.) Decide which properties should be pushed up into a super abstract class and which belong in the individual subclasses. You do not need to code every method – just place a stub placeholders.

3. Polymorphism - Write a driver program that uses a AECar reference variable to point to three different types of classes, showing that inheritance is one mechanism for using polymorphism.

4. Interface – Make the AECar class implement the Comparable Java interface. Write a driver program that sorts a list of 4 AECars according to price.

Answer 1

CarDriver.java

import java.util.*;
public class CarDriver
{
   public static void main(String[] args)
   {
       AlternativeEnergyCar car1 = new AlternativeEnergyCar(10000, 2010, 10000);
       AlternativeEnergyCar car2 = new HydrogenCar(0, 2019, 40000, 100, false);
       AlternativeEnergyCar car3 = new ElectricCar(0, 2019, 30000, 10, 50);
       AlternativeEnergyCar car4 = new NaturalGasCar(0, 2015, 20000, 5, 20);
       AlternativeEnergyCar car5 = new PropaneCar(0, 2019, 25000, 10, true);
      
       ArrayList<AlternativeEnergyCar> cars = new ArrayList<AlternativeEnergyCar>();
      
       cars.add(car1);
       cars.add(car2);
       cars.add(car3);
       cars.add(car4);
       cars.add(car5);
       Collections.sort(cars);
       System.out.println(cars);
      
   }

}

AlternativeEnergyCar.java

public class AlternativeEnergyCar implements Comparable<AlternativeEnergyCar>
{
   protected double miles;
   protected int yearmade;
   protected double price;
  
   public AlternativeEnergyCar()
   {
       this.miles = 0;
       this.yearmade = 2019;
       this.price = 50000;
   }
   public AlternativeEnergyCar(double miles, int yearmade, double price)
   {
       this.miles = miles;
       this.yearmade = yearmade;
       this.price = price;
   }
   public void setMiles(double miles)
   {
       this.miles = miles;
   }
   public void setYearMade(int yearmade)
   {
       this.yearmade = yearmade;
   }
   public void setPrice(double price)
   {
       this.price = price;
   }
   public double getMiles()
   {
       return this.miles;
   }
   public int getYearMade(int yearmade)
   {
       return this.yearmade;
   }
   public double getPrice()
   {
       return this.price;
   }
   public String toString()
   {
       return "\nmiles: "+miles+"\nyear made: "+yearmade+"\nprice: "+price;
   }
   public int compareTo(AlternativeEnergyCar otherAECar)
   {
       return -1*(Double.valueOf(otherAECar.getPrice()).compareTo(this.price));
   }
  
}

HydrogenCar.java

public class HydrogenCar extends NoEmissionsCar
{
   private boolean infastructure;
   public HydrogenCar()
   {
       this.infastructure = false;
   }
   public HydrogenCar(double miles, int yearmade, double price, double fuelcost, boolean infastructure)
   {
       super(miles, yearmade, price, fuelcost);
       this.infastructure = infastructure;
   }
   @Override
   public void setFuelCost(double fuelcost)
   {
       this.fuelcost = fuelcost;
   }
   @Override
   public double getFuelCost()
   {
       return this.fuelcost;
   }
   public void setInfastructure(boolean infastructure)
   {
       this.infastructure = infastructure;
   }
   public boolean getInfastructure(boolean infastructure)
   {
       return this.infastructure;
   }
   @Override
   public String toString()
   {
       return "\nmiles: "+miles+"\nyear made: "+yearmade+"\nprice: "+price+"\nfuel cost: "+fuelcost+"\ninfastructure: "+infastructure;
   }
}

NoEmissionsCar.java

public abstract class NoEmissionsCar extends AlternativeEnergyCar
{
   protected double fuelcost;
   public NoEmissionsCar()
   {
       this.fuelcost = 30;
   }
   public NoEmissionsCar(double miles, int yearmade, double price, double fuelcost)
   {
       super(miles, yearmade, price);
       this.fuelcost = fuelcost;
   }
   public abstract void setFuelCost(double fuelcost);
   public abstract double getFuelCost();
}

ElectricCar.java

public class ElectricCar extends NoEmissionsCar
{
   private double batterycharge;
   public ElectricCar()
   {
       this.batterycharge = 100;
   }
   public ElectricCar(double miles, int yearmade, double price, double fuelcost, double batterycharge)
   {
       super(miles, yearmade, price, fuelcost);
       this.batterycharge = batterycharge;
   }
   @Override
   public void setFuelCost(double fuelcost)
   {
       this.fuelcost = fuelcost;
   }
   @Override
   public double getFuelCost()
   {
       return this.fuelcost;
   }
   public void setBatteryCharge(double batterycharge)
   {
       this.batterycharge = batterycharge;
   }
   public double getBatteryCharge()
   {
       return this.batterycharge;
   }
   @Override
   public String toString()
   {
       return "\nmiles: "+miles+"\nyear made: "+yearmade+"\nprice: "+price+"\nfuel cost: "+fuelcost+"\nbattery charge: "+batterycharge;
   }

}

NaturalGasCar.java

public class NaturalGasCar extends EmissionsCar
{
   private double methaneemissions;
   public NaturalGasCar()
   {
       this.methaneemissions = 15;
   }
   public NaturalGasCar(double miles, int yearmade, double price, double emissions, double methaneemissions)
   {
       super(miles, yearmade, price, emissions);
       this.methaneemissions = methaneemissions;
   }
   @Override
   public void setEmissions(double emissions)
   {
       this.emissions = emissions;
      
   }
   @Override
   public double getEmissions()
   {
       return this.emissions;
   }
   public void setMethaneEmissions(double methaneemissions)
   {
       this.methaneemissions = methaneemissions;
      
   }
   public double getMethaneEmissions()
   {
       return this.methaneemissions;
   }
   @Override
   public String toString()
   {
       return "\nmiles: "+miles+"\nyear made: "+yearmade+"\nprice: "+price+"\nemissions: "+emissions+"\nmethane emissions: "+methaneemissions;
   }

}

EmissionsCar.java

public abstract class EmissionsCar extends AlternativeEnergyCar
{
   protected double emissions;
   public EmissionsCar()
   {
       this.emissions = 30;
   }
   public EmissionsCar(double miles, int yearmade, double price, double emissions)
   {
       super(miles, yearmade, price);
       this.emissions = emissions;
   }
   public abstract void setEmissions(double emissions);
   public abstract double getEmissions();
}

PropaneCar.java

public class PropaneCar extends EmissionsCar
{
   private boolean infastructure;
   public PropaneCar()
   {
       this.infastructure = true;
   }
   public PropaneCar(double miles, int yearmade, double price, double emissions, boolean infastructure)
   {
       super(miles, yearmade, price, emissions);
       this.infastructure = infastructure;
   }
   @Override
   public void setEmissions(double emissions)
   {
       this.emissions = emissions;
      
   }
   @Override
   public double getEmissions()
   {
       return this.emissions;
   }
   public void setMethaneEmissions(boolean infastructure)
   {
       this.infastructure = infastructure;
      
   }
   public boolean getMethaneEmissions()
   {
       return this.infastructure;
   }
   @Override
   public String toString()
   {
       return "\nmiles: "+miles+"\nyear made: "+yearmade+"\nprice: "+price+"\nemissions: "+emissions+"\ninfastructure: "+infastructure;
   }

}