Java

OOP GUIDE / WORK

VEHICLE SUPERCLASS

Topics

• Intro to Inheritance
• Using extends
• Superconstructors
• Testing inheritance

TASK – PART 1 – SETUP & EXAMINATION – THE VEHICLE CLASS

No solution required.

TASK – PART 2 – SETUP – VEHICLE CLASS

No solution required.

TASK – PART 3 – TESTING TRUCK

Here is my solution:

public class VehicleTester

{

public static void main(String[] args)

{

Vehicle v = new Vehicle("Jimmy Twoshoes", 123456);

System.out.println(v);

Truck t = new Truck("JT", 123457, false, 1000, 8000);

System.out.println(t.requiredHitch());

System.out.println(t);

}

}

The above outputs the following:

Vehicle (Owner:Jimmy Twoshoes, Reg#123456)

Class III

Vehicle (Owner:JT, Reg#123457)

TASK – PART 4 - TOSTRING

Here is the toString method that I added to truck:

public String toString()

{

String s = "Truck (Owner:" + owner + ", Reg#" + registrationNumber;

s = s + ", MaxPayLoad:" + payloadCapacity + "lbs";

s = s + ", MaxTowing:" + towingCapacity + "lbs";

if (hasExtendedCab == true)

s = s + ", ExtendedCab? Yes)";

else

s = s + ", ExtendedCab? No)";

return s;

}

The above will now output the following:

Vehicle (Owner:Jimmy Twoshoes, Reg#123456)

Class III

Truck (Owner:JT, Reg#123457, MaxPayLoad:1000lbs, MaxTowing:8000lbs, ExtendedCab? No)

TASK – PART 5 – CAR CLASS

public class Car extends Vehicle

{

public int seatingSpots;

public boolean hasLeatherInterior;

public double fuelEfficiencyPer100km; //usually 5L to 10L per 100km

public Car(String ow, int rn, int ss, boolean hli, double fep100)

{

super(ow, rn);

seatingSpots = ss;

hasLeatherInterior = hli;

fuelEfficiencyPer100km = fep100;

}

public boolean isFullEfficient()

{

if (fuelEfficiencyPer100km <= 6.0)

return true;

else

return false;

}

public String toString()

{

String s = "Car (Owner:" + owner + ", Reg#" + registrationNumber;

s = s + ", Seats:" + seatingSpots + "ppl";

s = s + ", FuelEfficiency:" + fuelEfficiencyPer100km + "L/100Km";

if (hasLeatherInterior == true)

s = s + ", Leather? Yes)";

else

s = s + ", Leather? No)";

return s;

}

}

TASK – PART 6 – TESTING

Here is my final version of the VehicleTester class:

public class VehicleTester

{

public static void main(String[] args)

{

Vehicle v = new Vehicle("Jimmy Twoshoes", 123456);

System.out.println(v);

Truck t = new Truck("JT", 123457, false, 1000, 8000);

System.out.println(t.requiredHitch());

System.out.println(t);

Car c = new Car("Little J", 123458, 5, true, 7);

System.out.println("This car is fuel efficient. " + c.isFullEfficient());

System.out.println(c);

}

}

The above will output:

Vehicle (Owner:Jimmy Twoshoes, Reg#123456)

Class III

Truck (Owner:JT, Reg#123457, MaxPayLoad:1000lbs, MaxTowing:8000lbs, ExtendedCab? No)

This car is fuel efficient. false

Car (Owner:Little J, Reg#123458, Seats:5ppl, FuelEfficiency:7.0L/100Km, Leather? Yes)