Question

Part 1: Create a Car class in accordance with the following specifications.

• make
• model
• year
• fuel tank size
• fuel economy – fuel economy at best speed
• optimal speed

Some of the other fields:

• odometer
• trip odometer
• color
• fuel level
  
  The Car class will also need at least 3 constructors:
• Car()
• Car(String, String, String, int, double, double, double)
• Car(Car)

  The Car class must implement the following methods.

  public fillTank(double): double
  
  public toString():String
  
  public equals(Car):boolean
  
  public driveCar():boolean
  
  public getTripOdometer():double
  
  public clearTripOdometer():void
  
  public getOdometer():double
  
  public getFuelLevel():double

  public getFuelTankSize():double
  
  public setUpTrip(double, double): void

Answer 1

/**
* Car Class Implementation
*/
public class Car {

   private String make;
   private String model;
   private String color;
   private int year;
   private double tankSize;
   private double fuelEconomy;
   private double optimalSpeed;
   private double fuelLevel;
   private double odometer;
   private double tripOdometer;
  

//default constructor  
   public Car() {
       make="";
       model="";
       color="";
       year=9999;
       tankSize=0.0;
       fuelEconomy=0.0;
       optimalSpeed=0.0;
   }
  
//parameterised constructor
   public Car(String make, String model, String color, int year, double tankSize, double fuelEconomy,
           double optimalSpeed) {
       super();
       this.make = make;
       this.model = model;
       this.color = color;
       this.year = year;
       this.tankSize = tankSize;
       this.fuelEconomy = fuelEconomy;
       this.optimalSpeed = optimalSpeed;
   }

   //copy constructor
   public Car(Car car) {
       make = car.make;
       model = car.model;
       color = car.color;
       year = car.year;
       tankSize = car.tankSize;
       fuelEconomy = car.fuelEconomy;
       optimalSpeed = car.optimalSpeed;
   }
  
//fill the tank will fuel
   public double fillTank(double fuel) {
       double remainingCapacity = tankSize - fuelLevel;
       if (fuel > remainingCapacity) {
           System.out.println("Current capacity of the tank is: " + remainingCapacity);
           System.out.println(remainingCapacity + " fuel is sufficient for the tank to fill");
           fuelLevel = tankSize;
       }
       else if (fuel < remainingCapacity){
           System.out.println("Fuel is less than the tank current Capacity: " + remainingCapacity);
           fuelLevel = fuelLevel + fuel;
       }
       else if (fuel == remainingCapacity) {
           System.out.println("Tank is full with the fuel");
           fuelLevel = tankSize;
       }
       return fuelLevel;
   }
  

   @Override
   public String toString() {
       return "Car [make=" + make + ", model=" + model + ", color=" + color + ", year=" + year + ", tankSize="
               + tankSize + ", fuelEconomy=" + fuelEconomy + ", optimalSpeed=" + optimalSpeed + ", fuelLevel="
               + fuelLevel + "]";
   }

   //compare the two car objects
   public boolean equals(Car obj) {
       if (this == obj)
           return true;
       if (obj == null)
           return false;
       if (getClass() != obj.getClass())
           return false;
       Car other = (Car) obj;
       if (color == null) {
           if (other.color != null)
               return false;
       } else if (!color.equals(other.color))
           return false;
       if (Double.doubleToLongBits(fuelEconomy) != Double.doubleToLongBits(other.fuelEconomy))
           return false;
       if (make == null) {
           if (other.make != null)
               return false;
       } else if (!make.equals(other.make))
           return false;
       if (model == null) {
           if (other.model != null)
               return false;
       } else if (!model.equals(other.model))
           return false;
       if (Double.doubleToLongBits(optimalSpeed) != Double.doubleToLongBits(other.optimalSpeed))
           return false;
       if (Double.doubleToLongBits(tankSize) != Double.doubleToLongBits(other.tankSize))
           return false;
       if (year != other.year)
           return false;
       return true;
   }
  
//check if the car is started
   public boolean driveCar() {
       if (this.tripOdometer > 0) {
           return true;
       }
       return false;
   }

   //return the tripOdometer
   public double getTripOdometer() {
       return this.tripOdometer;
   }
//clearing the tripOdometer after the ride or before ride
   public void clearTripOdometer() {
       this.tripOdometer = 0.0;
   }
//get the odometer reading
   public double getOdometer() {
       return this.odometer;
   }
//get the fuel level
   public double getFuelLevel() {
       return this.fuelLevel;
   }
//get the tank size
   public double getFuelTankSize() {
       return this.tankSize;
   }
//start the trip
   public void setUpTrip(double fuel, double optimalSpeed) {
       this.clearTripOdometer();
       this.fillTank(fuel);
       this.optimalSpeed = optimalSpeed;
   }
  
}