FleetOfVehicles.java

import java.util.Scanner;
//A class that keeps a fleet of different types of vehicles
public class FleetOfVehicles {
	//An array of vehicles
	private Vehicle[] fleet;
	public static final int MAX_VEHICLES = 100;
	public FleetOfVehicles()
	{
		fleet = new Vehicle[MAX_VEHICLES];
	}
	public Vehicle[] getFleet()
	{
		return this.fleet;
	}
	//Adds a new vehicle to the first empty spot in the fleet array
	public void addVehicle(Vehicle aV)
	{
		for(int i=0;i<fleet.length;i++)
		{
			if(fleet[i] == null)
			{
				fleet[i] = aV;
				return;
			}
		}
		//If it reaches here the array is full
		System.out.println("The fleet of vehicles is full!");
	}
	//Removes a vehicle.  It searches through the array for a vehicle that is equal to
	//the parameter and once it is found that value is set to null
	public void removeVehicle(Vehicle aV)
	{
		for(int i=0;i<fleet.length;i++)
		{
			if(fleet[i] != null && fleet[i].equals(aV))
			{
				fleet[i] = null;
				return;
			}
		}
		//If it reaches here then the vehicle was not found
		System.out.println("The vehicle was not found");
	}
	
	//A static keyboard to be used throughout the frontend
	static Scanner keyboard;
	//Entry point of the program
	public static void main(String[] args)
	{
		keyboard = new Scanner(System.in);//Construct the keyboard
		
		System.out.println("Welcome to the fleet manager");
		FleetOfVehicles fOfV = new FleetOfVehicles();//Creates a new instance of the FleetOfVehicles to be used
		
		boolean quit = false;
		while(!quit)//Runs until the user quits
		{
			printOptions();
			int pick = keyboard.nextInt();
			keyboard.nextLine();
			switch(pick)
			{
			case 1: //Add vehicle
				fOfV.addVehicle(makeAVehicleDialog());
				break;
			case 2: //Remove vehicle
				fOfV.removeVehicle(makeAVehicleDialog());
				break;
			case 9:
				quit = true;
				break;
			default:
				System.out.println("Invalid input");
			}
			System.out.println("The Fleet currently");
			printFleet(fOfV);
		}
		System.out.println("Goodbye");
	}
	//Displays the options to the user
	public static void printOptions()
	{
		System.out.println("Enter 1: to add a Vehicle\nEnter 2: to remove a Vehicle\nEnter 9 to quit");
	}
	//Returns an instance of a vehicle based on user input
	public static Vehicle makeAVehicleDialog()
	{
		Vehicle retV;
		int pick = 0;
		System.out.println("Enter 1: if it is a car\nEnter 2: if it is a truck\nEnter 3: if it is unclassified");
		pick = keyboard.nextInt();
		keyboard.nextLine();
		while(pick != 1 && pick != 2 && pick != 3)
		{
			System.out.println("Invalid choice pick again");
			pick = keyboard.nextInt();
			keyboard.nextLine();
		}
		System.out.println("Enter the manufacturer's name");
		String manuName = keyboard.nextLine();
		System.out.println("Enter the number of cylinders");
		int cylinders = keyboard.nextInt();
		keyboard.nextLine();
		System.out.println("Enter the owner's name");
		String ownersName = keyboard.nextLine();
		
		switch(pick)
		{
		case 1://Constructing a car
			System.out.println("Enter the car's gas mileage");
			double mileage = keyboard.nextDouble();
			keyboard.nextLine();
			System.out.println("Enter the number of passengers");
			int passengers = keyboard.nextInt();
			keyboard.nextLine();
			retV = new Car(manuName,cylinders,ownersName,mileage,passengers);
			break;
		case 2://Constructing a truck
			System.out.println("Enter the truck's load capacity");
			double loadCap = keyboard.nextDouble();
			keyboard.nextLine();
			System.out.println("Enter the truck's towing capacity");
			double towCap = keyboard.nextDouble();
			keyboard.nextLine();
			retV = new Truck(manuName,cylinders,ownersName,loadCap,towCap);
			break;
		default:
			retV = new Vehicle(manuName,cylinders,ownersName);
		}
		
		return retV;
	}
	public static void printFleet(FleetOfVehicles fV)
	{
		for(Vehicle v : fV.getFleet())
		{
			if(v == null)
				continue;
			System.out.println(v);
			System.out.println();
		}
	}
}