Calling a different class in the same src folder will not work. : I am trying to call the class, "CarFuel", from the same src folder. It is not working and shows an error.

Code for class with methods for main:
public class CarFuel {

    int CarFuel = 5; //Gallons of fuel starting in car


    public CarFuel(int FuelAmount){ //Constructor for defined staring fuel amount
        CarFuel = FuelAmount;
    }

    public void GetGasoline(int amount){ //Filling up gasoline, amount = how much gasoline filled up
        CarFuel = CarFuel + amount;
    }

    public void DrainGasoline(int amount){ //Driving car, amount = how much gasoline drained
        CarFuel = CarFuel - amount;
    }

    public int GetGasoline(){ //returns how much gasoline is left in the end
        return CarFuel;
    }

}

//MAIN EXEX IN CarFuelExec

Here is the main class that uses these methods:
public class CarFuelExec {

    public static void main(String[] args){

        CarFuel.car = new CarFuel(0);
        car.GetGasoline(36);
        car.DrainGasoline(5);
         System.out.println("The remaining fuel in your car is: " + car.GetGasoline + " gallons");

    }
}
Could anybody tell me why CarFuel.car = new Carfuel(0); is not calling the other class and is outputting an error?