Car 2

15 points

Introduction
This program asks you to create a more realistic version of the Car program you wrote earlier. The user will no longer be able to drive 10,000 miles without buying gas, or add 100 gallons of gas to his gas tank. This program is sufficiently different from your original Car program that I suggest that you start from scratch, using the Java program you can download in the Starting Point section below. You can run a completed version of the program in the Demo section below.

Instance Variables
In addition to the 6 instance variables in the original program, you'll need a double 'gasTankSize'. Instead of declaring 'Color color,' we declare 'String color' (We use a String to store the car's color.)

menu()
Give the user a series of options. This menu should repeat (inside a while loop) until the user chooses to quit. After asking a question with a 'System.out.print()' you can wait for the user's integer answer and record the answer with code like this: int choice = in.nextInt();
If the input from the user might be a double, you can record the answer like this: double choice2 = in.nextDouble();
If the input from the user is a String, you can use this: String choiceStr = in.nextLine();
If the input from the user is a single word, you can use this: String word = in.next();

If you'd like, you can use the 'switch' command in lieu of if statements. The beginning of this switch statement might look like this:
switch (choice)
{
   case 1:    drive();
      break;
   case 2:    addFuel();
      break;

If 'choice' is equal to 1 in the code above, drive() is called. If 'choice' is equal to 2, addFuel() is called, and so on. It is necessary to conclude each 'case' statement with 'break'.

drive()
Here is how the completed version of the program handles 4 different situations:

Here's how you could structure this in your program:

if (fuelLevel is less than or equal to 0.5)
{     ...
else
{     
     ask the user how far s/he wants to travel ('miles')
     if ('miles' is greater than 0)
     {
          calculate 'milesPossible'
          if ('miles' is greater than 'milesPossible')
          {
               update 'mileage' and 'fuelLevel' and write a message
          }
          else
          {
               update 'mileage' and 'fuelLevel' and write a message
          }
     }
}

The screenshot below shows how the drive() method should function.

addFuel()
Ask the user how much gas s/he wants to purchase. Check if this amount of gas would overfill the gas tank. If it would, notify the user of this problem and ask him to try again. If the amount of gas is OK, figure out the new 'fuelLevel' and print the results. If the user enters a negative number, do nothing.

The screenshot below illustrates addFuel():

addDevice()
As in the original program, add 5 mpg to 'mpg' when this method is called. However, set it up so that this method can only be called once. If the user calls addDevice() more than once, print a message that this fuel-saving device has already been added, and can only be added once.

changeColor()
Ask the user what color s/he wants the car to be. Update the car's color.

main()
Create your car, and call menu().

Running your program
Your program runs interactively in the console window. In NetBeans, you may want to make the font size larger. To do this, click in the console window and hit "CTRL - up arrow," or right-click and choose "Larger Font".

Demo
Here is the compressed zip file for the completed program. Right-click on the link to download Car2.zip to the root of your server space (H:). Double-click on the downloaded Car2.zip to extract the files Car2.jar and Car2.bat. Then, to run the program, double-click on Car2.bat.

Starting Point
You can download Car2.java to use as a starting point in writing your program.