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5.9 To the class Vehicle, add a refuel method that expects two parameters, fuelQuantity and milesSince LastFueling. Also add instance variables to the Vehicle class for totalMileage and totalFuelConsumed. Further, add an accessor method called fuelEconomy that will return the total miles per gallon of the vehicle. private double totalFuel = 0.; private double totalMiles = 0.; . . public void reFuel( double fuelQuantity, double milesSinceLastFueling ){ totalMiles += milesSinceLastFueling; totalFuel += fuelQuantity; } public double fuelEconomy() { return totalMiles / totalFuel; } What will you do to make the refuel method work properly when invoked on an instance of Skateboard class Skateboard extends Vehicle { public Skateboard( String mk, String mdl, String clr ) { super( mk, mdl, 1, clr ); } public double changeSpeed( double newSpeed ) { if( newSpeed > 10. ) { newSpeed = 10.; } double accel = newSpeed - this.getSpeed(); this.setSpeed( newSpeed ); return accel; } public double fuelEconomy() throws UnsupportedOperationException { throw new UnsupportedOperationException( "Skateboard uses no fuel" ); } public void reFuel(double gallons, double miles) throws UnsupportedOperationException { throw new UnsupportedOperationException( "Skateboard uses no fuel" ); } } Write a test class called ManyVehicles that creates a variety of different Vehicles, exercises all the methods you have created, and checks for proper execution. Try to set the speed of a Skateboard to 60, for example, or to refuel a Skateboard. Check that the fuel economy calculations are being performed correctly. public class ManyVehicles { // main method: tests the Vehicle class public static void main( String[] args ) { Vehicle v1, v2, v3, v4;
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v1 = new Vehicle( "Ford", "Mustang", 2, "red" ); v2 = new Vehicle( "BMW", "328i", 4, "silver" ); v3 = new Vehicle( "Chrysler", "PT Cruiser", 4, "gold" ); System.out.println( "There are " + Vehicle.vehicleCount + " vehicles." ); System.out.println( "Make of v1 (Ford): " + v1.getMake() ); System.out.println( "Model of v2 (328i):" + v2.getModel()); System.out.println( "Color of v3 (gold: " + v3.getColor()); System.out.println( "Max occupants of v1 (2): " + v1.getMaxOccupants() ); double accel = v1.changeSpeed( 70. ); System.out.println( v1.getModel() + " accelerated by " + accel + "mph to " + v1.getSpeed() + "mph." ); v1.setMake( "Chevrolet" ); v1.setModel( "Malibu" ); v1.setColor( "white" ); v1.setSpeed( 60. ); System.out.println( "v1 is now a " + v1.getColor() + " " + v1.getMake() + " " + v1.getModel() + " going " + v1.getSpeed() + "mph." ); v4 = new Skateboard( "Mako", "Shark", "red" ); accel = v4.changeSpeed( 5. ); System.out.println( "v4 is a " + v4.getMake() + " " + v4.getModel() + " " + v4.getColor() + " Skateboard going " + v4.getSpeed() + "mph."); accel = v4.changeSpeed( 22. ); System.out.println( "The Skateboard is now going " + v4.getSpeed() + "mph." ); v2.reFuel( 11.3, 295.); //should be 26.1 mpg System.out.println( "The " + v2.getMake() + " mileage: " + v2.fuelEconomy() ); try{ System.out.println( "Refueling skateboard" ); v4.reFuel( 0., 5.); } catch( Exception e ) { System.out.println( e.getMessage() ); } } } 5.10 Write a class that extends Exception and is called TooManyOccupantsException. Have the Vehicle class mutator for number of occupants throw such an exception if the numberOfOccupants would exceed the maximum number of occupants for the vehicle. What will you need to change in your ManyVehicles test class
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public class TooManyOccupantsException extends Exception { TooManyOccupantsException( int occupantCount ) { super( "Vehicle cannot accommodate " + occupantCount ); } } In ManyVehicles test class: try{ System.out.println( "adding people to Ford" ); v1.setOccupants( 6 ); } catch( Exception e ) { System.out.println( e.getMessage() ); } 5.11 Change your ManyVehicles class so that it reads from a text file called Vehicles.txt the specifications for the Vehicles to create. Use a BufferedReader or a Scanner to read the file. Using a Scanner is probably easier in this case. Here is a sample Vehicles.txt file. The first word in a line is the class, the second word in a line is color, the third word in a line is the make, the fourth word is the model, and the fifth word is the maximum number of occupants. In the case of a bus, there is a sixth word in the line giving the driver s name: Vehicle red Vehicle silver BMW Bus blue Vehicle gold Skateboard orange Ford F-150 328i 4 GM bus Chrysler PTCruiser WorldIndustries ProBoard 3 32 Jones 4 1
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If there is a file name on the command line, read from the file; otherwise simply create some hard-coded examples in the ManyVehicles main method. This is the code snippet that decides how to create the Vehicles and then creates them: if( args.length == 0 ) { //There is no file name on the command line, so // make up some vehicles with hard coding vehicles[0] = new Vehicle( "Ford", "Mustang", 2, "red" ); vehicles[1] = new Vehicle( "BMW", "328i", 4, "silver" ); vehicles[2] = new Vehicle( "Chrysler", "PT Cruiser", 4, "gold" ); System.out.println( "There are " + Vehicle.vehicleCount + " vehicles." ); System.out.println( "Make of vehicles[0]: " + vehicles[0].getMake() ); System.out.println( "Model of vehicles[1] (328i): " + vehicles[1].getModel() ); System.out.println( "Color of vehicles[2] (gold): " + vehicles[2].getColor() ); System.out.println( "Max occupants of vehicles[0]: " + vehicles[0].getMaxOccupants() ); }
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