Question

For today's lab we will be using the Car Object Class which we built in Lab 1. I have attached my solution if you would prefer to use my solution instead of your own solution.

We will working on remembering how to build sub-classes and user interfaces. So we will be creating new Java files for:

• An Interface called GreenHouseGasser
  • Requires a method called CO2() which returns how much carbon dioxide the Object produces.
  • Make sure to update Car so that Car implements GreenHouseGasser. Cars should produce 1.5 units of CO2 for every mph the car is traveling.
• A Car sub-class called SportsCar:
  • Overrides the accelerate() method. SportsCars accelerate twice as fast as regular Cars
  • Overrides the CO2() method. SportsCars should be using a factor of 3.25 units of CO2 for every mph
• A Car sub-class called EcoCar
  • Overrides the accelerate() method. EcoCars accelerate 25% as fast as regular Cars
  • Overrides the CO2() method. EcoCars should be using a factor of .33 units of CO2 for every mph

As your are building/updating your objects, remember to test. You'll need update the Driver to test your new methods and Objects!

Submit all of your .java files in one jar or zip file.

Grading Breakdown:

• Driver tests all new methods and objects -- 25%
• Interface created correctly and Car updated to implement the Interface -- 25%
• SportsCar correctly created -- 20%
• EcoCar correctly created -- 20%
• JavaDoc comments! -- 10%

Here is the Car Object pre-made:

public class Car
{
private String name;
private int currentSpeed;
  
public Car(String inName)
{
name = inName;
}
  
public void accelerate()
{
currentSpeed += 10;
}
  
public void park()
{
currentSpeed = 0;
}
  
public void printCurrentSpeed()
{
System.out.println("Current Speed is: " + currentSpeed);
}
}

Here is the driver that is supposed to be used:

public class Driver {
  
   public static void main(String[] args) {
       // create new Audi car
       Car audi = new Car("Audi");
       // create new Nissan car
       Car nissan = new Car("Nissan");
      
       // print current speed of Audi - it is 0
       audi.printCurrentSpeed();
      
       // call the accelerate method twice on Audi
       audi.accelerate();
       audi.accelerate();
      
       // call the accelerate method once on Nissan
       nissan.accelerate();
      
       // print current speed of Audi - it is now 20 mpH
       audi.printCurrentSpeed();
       // print current speed of Nissan - it is 10 mpH
       nissan.printCurrentSpeed();
      
       // now park the Audi car
       audi.park();
      
       // print current speed of Audi - it is now 0, because the car is parked
       audi.printCurrentSpeed();
   }
}

Answer 1

car.java

package car;

class Car implements GreenHouseGasser{

private String name;
private int currentSpeed; /// speed is in milege per hour
private double distance; /// distance travelled by Car in miles
public Car(String inName)
{
name = inName;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public int getCurrentSpeed() {
return currentSpeed;
}

public void setCurrentSpeed(int currentSpeed) {
this.currentSpeed = currentSpeed;
}

public double getDistance() {
return distance;
}

public void setDistance(double distance) {
this.distance = distance;
}
  
/// method to accelerate by 10 mph
public void accelerate()
{
currentSpeed += 10;
}

/// method to increment distance when Car runs for given time
public void incrementDistance(double time){ ///distance=speed*time
distance=distance+(this.getCurrentSpeed()*time);
}
  
public void park()
{
currentSpeed = 0;
}
  
public void printCurrentSpeed()
{
System.out.println("Current Speed is: " + currentSpeed);
}
  
/// method to produce 1.5 Co2
public double CO2(){
return this.distance*1.5;
}
  
}

/// GreenHouseGasser.java

package car;

public interface GreenHouseGasser {
double CO2();
}

///Driver.java

package car;

class SportsCar extends Car{
  
public SportsCar(String inName) {
super(inName);
}

/// overidng Co2 method of Car as sports car releases 3.25 units co2 per mile
@Override
public double CO2() {
return 3.25*this.getDistance();
}
/// overidng accelerate method of Car as SportsCar accelerated speed by 20% of actual speed
@Override
public void accelerate() {
// super.accelerate(); //*A* /// increase normal cars speed by 10
//this.setCurrentSpeed( (int)(this.getCurrentSpeed()*1.25)); /// *B* increment speed by 2 times car speed

this.setCurrentSpeed( (int)(this.getCurrentSpeed()+ 20));
}
  
}//SportCar

class EcoCar extends Car{
  
public EcoCar(String inName) {
super(inName);
}
/// overidng Co2 method of EcoCar as eco car releases 0.33 units co2 per mile
@Override
public double CO2() {
return 0.33*this.getDistance();
}
/// overidng accelerate method of Car as Eco car accelerated speed by 25% of actual speed
@Override
public void accelerate() {
// super.accelerate(); //*A* /// increase normal cars speed by 10
this.setCurrentSpeed( (int)(this.getCurrentSpeed()+12.5));
}
  
}//EcoCar

public class Driver {
public static void main(String[] args) {
// create new Audi car
Car audi = new Car("Audi");
SportsCar nissan = new SportsCar("Nissan");
EcoCar ecoCar=new EcoCar("ecocar");
System.out.println("Audi current spead = ");
audi.printCurrentSpeed();
System.out.println("Nissan current spead = ");
nissan.printCurrentSpeed();
System.out.println("Ecocar current spead = ");
ecoCar.printCurrentSpeed();

audi.accelerate();
nissan.accelerate();
ecoCar.accelerate();
System.out.println("\nAudi current spead = ");
audi.printCurrentSpeed();   
System.out.println("Nissan current spead = ");
nissan.printCurrentSpeed();   
System.out.println("Ecocar current spead = ");
ecoCar.printCurrentSpeed();
/// lets assume all three cars run for time = 1 hr
//hence all cars calls incrementDistance for 1 hr
audi.incrementDistance(1);
nissan.incrementDistance(1);
ecoCar.incrementDistance(1);
System.out.println("Audi current distance travelled = "+audi.getDistance());
System.out.println("Nissan current distance travelled = "+nissan.getDistance());
System.out.println("Ecocar current distance travelled = "+ecoCar.getDistance());
System.out.println("Audi co2 produced = "+audi.CO2());
System.out.println("Nissan co2 produced = "+nissan.CO2());
System.out.println("Ecocar co2 produced = "+ecoCar.CO2());


audi.accelerate();
nissan.accelerate();
ecoCar.accelerate();   
System.out.println("\nAudi current spead = ");
audi.printCurrentSpeed();   
System.out.println("Nissan current spead = ");
nissan.printCurrentSpeed();   
System.out.println("Ecocar current spead = ");
ecoCar.printCurrentSpeed();
/// lets assume all three cars run for time = 2 hr
//hence all cars calls incrementDistance for 2 hr
audi.incrementDistance(2);
nissan.incrementDistance(2);
ecoCar.incrementDistance(2);
System.out.println("Audi current distance travelled = "+audi.getDistance());
System.out.println("Nissan current distance travelled = "+nissan.getDistance());
System.out.println("Ecocar current distance travelled = "+ecoCar.getDistance());
System.out.println("Audi co2 produced = "+audi.CO2());
System.out.println("Nissan co2 produced = "+nissan.CO2());
System.out.println("Ecocar co2 produced = "+ecoCar.CO2());

audi.accelerate();
nissan.accelerate();
ecoCar.accelerate();   
System.out.println("\nAudi current spead = ");
audi.printCurrentSpeed();   
System.out.println("Nissan current spead = ");
nissan.printCurrentSpeed();   
System.out.println("Ecocar current spead = ");
ecoCar.printCurrentSpeed();
/// lets assume all three cars run for time = 1.5 hr
//hence all cars calls incrementDistance for 1.5 hr
audi.incrementDistance(1.5);
nissan.incrementDistance(1.5);
ecoCar.incrementDistance(1.5);
System.out.println("Audi current distance travelled = "+audi.getDistance());
System.out.println("Nissan current distance travelled = "+nissan.getDistance());
System.out.println("Ecocar current distance travelled = "+ecoCar.getDistance());
System.out.println("Audi co2 produced = "+audi.CO2());
System.out.println("Nissan co2 produced = "+nissan.CO2());
System.out.println("Ecocar co2 produced = "+ecoCar.CO2());

// now park the Audi car
audi.park();
nissan.park();
ecoCar.park();
System.out.println("\nAudi current spead = ");
audi.printCurrentSpeed();   
System.out.println("Nissan current spead = ");
nissan.printCurrentSpeed();   
System.out.println("Ecocar current spead = ");
ecoCar.printCurrentSpeed();

}

}

/// output:

run:
Audi current spead =
Current Speed is: 0
Nissan current spead =
Current Speed is: 0
Ecocar current spead =
Current Speed is: 0

Audi current spead =
Current Speed is: 10
Nissan current spead =
Current Speed is: 20
Ecocar current spead =
Current Speed is: 12
Audi current distance travelled = 10.0
Nissan current distance travelled = 20.0
Ecocar current distance travelled = 12.0
Audi co2 produced = 15.0
Nissan co2 produced = 65.0
Ecocar co2 produced = 3.96

Audi current spead =
Current Speed is: 20
Nissan current spead =
Current Speed is: 40
Ecocar current spead =
Current Speed is: 24
Audi current distance travelled = 50.0
Nissan current distance travelled = 100.0
Ecocar current distance travelled = 60.0
Audi co2 produced = 75.0
Nissan co2 produced = 325.0
Ecocar co2 produced = 19.8

Audi current spead =
Current Speed is: 30
Nissan current spead =
Current Speed is: 60
Ecocar current spead =
Current Speed is: 36
Audi current distance travelled = 95.0
Nissan current distance travelled = 190.0
Ecocar current distance travelled = 114.0
Audi co2 produced = 142.5
Nissan co2 produced = 617.5
Ecocar co2 produced = 37.620000000000005

Audi current spead =
Current Speed is: 0
Nissan current spead =
Current Speed is: 0
Ecocar current spead =
Current Speed is: 0
BUILD SUCCESSFUL (total time: 0 seconds)