Java Error Project

class Vehicle
{
    int year, miles;
    double purchasePrice, forSalePrice;
    double [] priceHistory = new double[5];
    String status = "Unknown", make, model, VIN, color;
    String [] feature = new String[5];

    public Vehicle (int yr, String carMake)
    {
        year = yr;
        make = carMake;
        model = "N/A";
        VIN = "N/A";
        color = "N/A";
    }

    //
    public Vehicle (int yr, String carMake, String carModel)
    {
        year = yr;
        make = carMake;
        model = carModel;
        VIN = "N/A";
        color = "N/A";
    }

    public Vehicle(int yr, String carMake, String carModel, char status, double forSalePrice)
    {
    	year = yr;
        make = carMake;
        model = carModel;
        setStatus(status);
        this.forSalePrice = forSalePrice;
        color = "N/A";
        VIN = "N/A";
    }

    public void setYear(int vehYear)
    {
        year = vehYear;
    }

    public void setMiles(int vehMiles)
    {
        miles = vehMiles;
    }

    public void setPurchasePrice(double price)
    {
        purchasePrice = price;
    }

    public void setForSalePrice(double price)
    {
        updatePriceHistory(price);
        forSalePrice = price;
    }

    public void setMake(String make)
    {
        this.make = make;
    }

    public void setModel(String model)
    {
        this.model = model;
    }

    public void setVIN(String VIN)
    {
        this.VIN = VIN;
    }

    public void setColor(String color)
    {
    	this.color = color;
    }

    public void setFeature(String newFeature)
    {
    	int i = 0;
        for(i = 0; i < feature.length; i++)
        {
        	if(feature[i] == null)
        	{
        		feature[i] = newFeature;
        		break;
        	}
        }
        if(i == feature.length)
        	System.out.println("Feature not added, please remove a feature to add new ones.");
    }

    public void removeFeature(int a)
    {
    	feature[a] = null;
    	while(a < feature.length - 1)
    	{
    		String temp = feature[a];
    		feature[a] = feature[a + 1]; //sorting algorithm
    		feature[a + 1] = temp;
    		a++;
    	}
    }

    public String getFeature(int feat)
    {
    	if(feat >= feature.length || feat < 0)
    		return "Invalid feature index.";
    	else
    	{
    			return feature[feat];
    	}
    }

    public int getFeatureLength()
    {
    	return feature.length;
    }

    public boolean setStatus(char stat)
    {
        switch (stat)
        {
            case 'a': status="Active"; break;
            case 'c': status="Canceled"; break;
            case 's': status="Sold"; break;
            default: status="Unknown";

        }
        if (status.equals("Unknown")) return false;
        else return true;
    }

    public String getStatus()
    {
        return status;
    }

    public String getListing()
    {
        return make + " " + model +" " + year + " " + color + " " + forSalePrice;
    }

    public String getAllDetails()
    {
    	String temp = feature[0];
    	if(temp == null)
    		return "Make: " + make + "\n" + "Model: " + model + "\n" + "Year: " + year + "\n" + "Color: " + color + "\n" + "Purchase price: " + purchasePrice + "\n" + "For Sale price: " + forSalePrice;
    	else
    	{
    		for (int i = 1; i < getFeatureLength(); i++) {
    			if (getFeature(i) != null)
    			{
    				temp = temp + ", " + feature[i];
    			}
    		}
    	return "Make: " + make + "\n" + "Model: " + model + "\n" + "Year: " + year + "\n" + "Color: " + color + "\n" + "Purchase price: " + purchasePrice + "\n" + "For Sale price: " + forSalePrice + "\n" + "Features: " + temp;
    	}
    }

    public double getSalePrice()
    {
    	return forSalePrice;
    }
    private void updatePriceHistory(double newPrice)
    {
    	priceHistory[4] = priceHistory[3];
    	priceHistory[3] = priceHistory[2];
    	priceHistory[2] = priceHistory[1];
    	priceHistory[1] = priceHistory[0];
    	priceHistory[0] = newPrice;
    }

    public String getMakeModel()
    {
    	return make + " " + model;
    }
}


import java.util.Scanner;

public class UsedCarLot {
	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		Vehicle[] auto = { new Vehicle(1998, "Chevrolet"), new Vehicle(2012, "BMW", "M3"), new Vehicle(2015, "Ford"),
				new Vehicle(2008, "Hyundai", "Sonata", 'a', 12040), new Vehicle(2013, "Jeep", "Wrangler", 'a', 17900),
				new Vehicle(2016, "Mazda", "Miata"), new Vehicle(1969, "Ford", "Mustang") };

		System.out.println("Hi! Welcome to our Car Lot!");

		int input = 0;

		System.out.println("Select any number to perform the following operation.");

		while (input != 9) {
			System.out.println("1. Update Vehicle" + "\n" + "2. List Inventory (All)" + "\n"
					+ "3. List Summary Inventory (For Sale only)" + "\n" + "4. List Extended Vehicle Details" + "\n"
					+ "9. Exit");
			input = scanner.nextInt(); //Provides error relating to this line.

			switch (input) {
			case 1: // update vehicle
				System.out.println("Please select the vehicle you would like to update with the corresponding number.");
				for (int a = 0; a < auto.length - 1; a++) {
					int b = a + 1;
					System.out.println(b + ". " + auto[a].getMakeModel());
				}
				int v = scanner.nextInt();
				updateMenu(auto[v - 1]);
				break;
			case 2: // 2. List Inventory (All)
				System.out.println("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~");
				for (int a = 0; a < auto.length - 1; a++) {
					int c = a + 1;
					System.out.println(c + ". " + auto[a].getListing());
				}
				System.out.println("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~");
				break;
			case 3: // 3. List Summary Inventory (For Sale only)
				System.out.println("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~");
				int b = 1;
				for (int a = 0; a < auto.length - 1; a++) {
					if (auto[a].getStatus().equals("Active")) {
						System.out.println(b + ". " + auto[a].getListing());
						b++;
					}
				}
				System.out.println("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~");
				break;
			case 4:// 4. List ALL Vehicle Details
				System.out.println("Select the Make/Model of the car you would like to see extended details about.");
				for (int a = 0; a < auto.length - 1; a++) {
					int d = a + 1;
					System.out.println(d + ". " + auto[a].getMakeModel());
				}
				int detailScanner = scanner.nextInt();
				if (detailScanner < 1 || detailScanner > auto.length - 1)
					System.out.println("Invalid car number.");
				else {
					System.out.println("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~");
					System.out.println(auto[detailScanner - 1].getAllDetails());
				}
				System.out.println("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~");
				break;
			case 9: // exit
				System.out.println("Thank you.");
				break;
			default:
				System.out.println("Please enter a number listed.");
			}
		}
		scanner.close();
	}

	private static void updateMenu(Vehicle auto) {
		Scanner scan = new Scanner(System.in);
		int input = 1;
		 while (input != 0) {
			System.out.println("Please choose from the following:" + "\n" + "1. Update VIN" + "\n" + "2. Update Model"
					+ "\n" + "3. Update Miles" + "\n" + "4. Update Purchase Price" + "\n" + "5. Update For Sale Price"
					+ "\n" + "6. Update Status" + "\n" + "7. Update Color" + "\n" + "8. Add Feature" + "\n"
					+ "9. Remove Feature" + "\n" + "0. Exit");
			input = scan.nextInt();
			switch (input) {
			case 1: // 1. Update VIN
				System.out.println("Please enter the desired VIN");
				String tempVIN = scan.next();
				if (tempVIN.length() == 17) {
					auto.setVIN(tempVIN);
					System.out.println("VIN successfully set to " + tempVIN + ".");
				} else
					System.out.println("invalid VIN length.");
				break;
			case 2: // 2. Update Model
				System.out.println("Please enter the desired Model, in either one word, or dashed.");
				String tempModel = scan.next();
				auto.setModel(tempModel);
				System.out.println("Model successfully set to " + tempModel + ".");
				break;
			case 3: // 3. Update Miles
				System.out.println("Please enter the desired milage");
				int tempMiles = scan.nextInt();
				auto.setMiles(tempMiles);
				System.out.println("Milage successfully set to " + tempMiles + ".");
				break;
			case 4: // 4. Update Purchase Price
				System.out.println("Please enter the desired Purchase Price");
				double tempPurchase = scan.nextDouble();
				auto.setPurchasePrice(tempPurchase);
				System.out.println("Purchase successfully set to " + tempPurchase + ".");
				break;
			case 5: // 5. Update For Sale Price
				System.out.println("Please enter the desired Sale Price");
				Double tempSale = scan.nextDouble();
				if (tempSale < auto.getSalePrice()) {
					System.out.println("This price is lower than the current for sale price. Do you wish to continue?"
							+ "\n" + "1. Yes." + "\n" + "2. No.");
					int a = scan.nextInt();
					if (a == 1) {
						auto.setForSalePrice(tempSale);
						System.out.println("Sale Price successfully set to " + tempSale + ".");
					} else if (a == 2)
						System.out.println("Sale Price not updated.");
					else
						System.out.println("Invalid key. Please select 5 if you wish to update in the future.");
				} else {
					auto.setForSalePrice(tempSale);
					System.out.println("Sale Price successfully set to " + tempSale + ".");
				}
				break;
			case 6: // 6. Update Status
				System.out.println(
						"Please enter the desired Status. Enter a for Active Status. Enter c for Canceled Status. Enter s for Sold Status.");
				int temp = 0;
				while (temp == 0) {
					char tempStatus = scan.next().charAt(0);
					if (tempStatus != 'a' && tempStatus != 'c' && tempStatus != 's' && tempStatus != 'e')
						System.out.println("Invalid character, please try again, or e to exit.");
					else if (tempStatus == 'e')
						temp = 1;
					else {
						auto.setStatus(tempStatus);
						System.out.println("Status successfully set to " + tempStatus + ".");
						temp = 1;
					}
				}
				break;
			case 7:// 7. Update Color
				System.out.println("Please enter the desired Color, in either one word, or dashed.");
				String tempColor = scan.next();
				auto.setColor(tempColor);
				System.out.println("Color successfully set to " + tempColor + ".");
				break;
			case 8: // 8. Add Feature
				System.out.println("Please enter the desired Feature, in either one word, or dashed.");
				String tempFeat = " ";
				while (!tempFeat.equals("0")) {
					tempFeat = scan.next();
					if (!tempFeat.equals("0")) {
						auto.setFeature(tempFeat);
						System.out.println("You may type another feature, or 0 to exit.");
					}
				}
				break;
			case 9: // 9. Remove Feature
				System.out.println("Please remove the desired Feature (select number).");
				int temp2 = 1;
				while (temp2 != 0) {
					System.out.println("List of Features, select number to remove.");
					for (int i = 0; i < auto.getFeatureLength(); i++) {
						if (auto.getFeature(i) != null) {
							System.out.println(i + 1 + ". " + auto.getFeature(i));
						}
					}
					System.out.println("0. To Exit.");

					temp2 = scan.nextInt();
					if (temp2 != 0) {
						System.out.println("Feature Successfully removed, remove another or select 0 to exit.");
						auto.removeFeature(temp2 - 1);
					}
				}
				break;
			case 0: // exit

				break;
			default:
				System.out.println("Please enter a number listed.");
				break;
			}
		}
		scan.close();
	}
}