Please help there's an error in my code but I can't figure it out.

Please help there's an error in my code but I can't figure it out.

This is the task:

In this assignment, you will design and program a basic application for a small hardware store. You must
use the Java language to create a utility that implements
(i) the application logic;
(ii) a simple mathematical model for the real problem;
(Ili) basic user interface.

Assume that the hardware store's inventory has products of three types:
- Products of type X, Products of type Y, Products of type Z.

Your program must show the list of available products in the form of a menu and ask the user to choose
the product, its amount, and the planned date of purchasing. Then, the program must calculate and
output the total.

Start development process by planning your data and program organization. Because the primary data
(products) have multiple properties, it is feasible to keep them as objects. Though you can begin with
the program's structure and logic - the program must have a method to read user's data, three methods
to calculate totals, and a method to show the result.

As the first step, program the methods to calculate totals. At this stage, consider direct input (no menu)
or hardcoding of the parameters for each of the three methods and ensure they produce correct results
Use switch or if-else-if to call the method that you want to run.

Here is my code:

import java.util.Scanner;

public class Inventory {

privatestaticfinalintLightBulb60W = 1;

privatestaticfinalintLightBulb100W = 2;

privatestaticfinalintBoltM5 = 3;

privatestaticfinalintBoltM8 = 4;

privatestaticfinalintHose25 = 5;

privatestaticfinalintHose50 = 6;

publicstaticvoidmain(String[]args){

// Project 2

// A basic application for a small hardware store

//Scanner Object

Scannerkeyboard=newScanner(System.in);

// Identifier declarations

intmonth;

intday;

intyear;

Stringcost;

inttotal;

intunits;

// Inventory list

getInventoryList();

// List of products

int[]productTypeList=newint[]{1,2,3,4,5,6};

double[]priceList=newdouble[]{3,5.99,0.15,0.25,10,15};

//Prints out inventory

privatestaticfinalvoidgetInventoryList(){

        System.out.println("The Inventory: ");

        System.out.println("1 Light Bulb 60W 3.00  X");

        System.out.println("2 Light Bulb 100W 5.99 X");

        System.out.println("3 Steel Bolt M5 0.15 Y");

        System.out.println("4 Steel Bolt M8 0.25 Y");

        System.out.println("5 Hose 25 feet 10.00 Z");

        System.out.println("6 Hose 50 feet 15.00  Z\n"); {

        }

        // Asks user to input date of purchase

        System.out.print("When do you plan your purchase? \n");

        System.out.print("Month of purchase (mm): ");

        month = keyboard.nextInt();

        System.out.print("Day of purchase (dd): ");

        day = keyboard.nextInt();

        System.out.print("Year of purchase (yyyy): ");

        year = keyboard.nextInt();

      // Asks user to input list

        System.out.print("Which item number from the list do you desire? \n");

        System.out.print("1, 2, 3, 4, 5 or 6?\n");

        total = keyboard.nextInt();

        System.out.print("Your choice: " + total + "\n");

     // Units

        System.out.print("How many units do you desire? \n");

        units = keyboard.nextInt();

        System.out.print("Number of units: ");

     // Switch Statement 

        switch(ProductType) 

        {

        case LightBulb60W:

        cost = "3.00";

        break;

        case LightBulb100W:

        cost = "5.99";

        break;

        case BoltM5:

        cost = "0.15";

        break;

        case BoltM8 :

        cost = "0.25";

        break;

        case Hose25 :

        cost = "10.00";

        break;

        case Hose50:

        cost = "15.00";

        break;

        }

        System.out.println(total);

        System.out.print("Your total for " + ProductType  + " is: " + "$" + cost * units + "\n");

}

}