/*
  Author:  James Tam
  Version: March 2, 2021
*/

public abstract class Car implements Vehicle
{
    public static final int MAX_FEUL = 40;
    private int fuel;
    private boolean engineOn;

    // The no argument constructor written by James Tam
    public Car()
    {
        fuel = MAX_FEUL;
        engineOn = false;
    }

    // The consumeFeul method was written by James Tam
    public void consumeFeul(int amount)
    {
        int temp = fuel - amount;
        if (temp >= 0)
            fuel = temp;
        else
            System.out.println("Consuming " + amount + " of fuel puts current " +
              "fuel at " + temp + " units.");
    }

    //Students must implement the method start()

    public String toString()
    {
        String s = "Fuel: " + this.fuel + ", " + "Engine on: " + engineOn;
        return(s);
    }

    //Students must write the header definition for the abstract method travelOneUnit()
}