Main.java

import com.company.Product;
import com.company.Tax;

import java.util.Scanner;

public class Main {

	public static void main(String[] args)
	{
		// create products
        Product[] products = new Product[]{
			new Product("10001", "Surge", 12, 4.99),
			new Product("20001", "Crystal Pepsi", 12, 4.99),
			new Product("30001", "Hubba Bubba", 12, 4.99),
			new Product("40001", "Coke 2", 12, 4.99),
			new Product("50001", "Slice", 12, 4.99)
        };

		// create tax brackets
		Tax[] taxes = new Tax[]{
			new Tax("CT", 7.5),
			new Tax("VT", 7.5),
			new Tax("WI", 7.5),
			new Tax("CA", 7.5),
			new Tax("WA", 7.5),
		};

		// Print out Menu for user to reference
		String format = "%-15s%-15s%-15s%-15s\r\n";
		System.out.format(format, new String[] { "Soda Product", "Product Code", "Case Quantity", "Cost" });
		System.out.format(format, new String[] { "------------", "------------", "-------------", "----" });

		for (Product p : products) {
			System.out.format("%-15s", p.getName());
			System.out.format("%-15s", p.getCode());
			System.out.format("%-15s", p.getCaseCount());
			System.out.format("%-15s\r\n", p.getCost());
		}
		System.out.println("");

		// ask questions
		Scanner input = new Scanner (System.in);

		Product selectedProduct = null;
		while(selectedProduct == null) {
			System.out.println("Please enter the Product ID: ");
			String selection = input.nextLine();

			// determine the product that was selected
			for (Product p : products) {
				if (p.getCode().equalsIgnoreCase(selection)) {
					selectedProduct = p;
				}
			}
		}

		int count = 0;
		while(count <= 0) {
			System.out.println("Please enter the number of cases you wish to purchase: ");
			String cases = input.nextLine();
			try {
				count = Integer.parseInt(cases);
			} catch (NumberFormatException e){
				count = 0;
			}
		}

		Tax selectedTax = null;
		while(selectedTax == null) {
			System.out.println("Please enter the state from which you are purchasing from. (CT, VT, WI, CA, WA)");
			String state = input.nextLine();

			// find tax
			for (Tax t : taxes) {
				if (t.getState().equalsIgnoreCase(state)) {
					selectedTax = t;
				}
			}
		}

		int caseCount = selectedProduct.getCaseCount();
		double productPrice = selectedProduct.getCost();
		double taxApplied = selectedTax.getTax();

		// Calculating the Quantity of individual items ordered
		double totalItems = (count * caseCount);

		// Calculating the Sub total
		double subTotal = (count * productPrice);
		
		// Calculating the Sales Tax on the items
		double tax = (subTotal * taxApplied)/100;
				
		// Calculating the Grand Total
		double grandTotal = (subTotal + tax);

		//Output Results
		System.out.println("The soda you have selected is: " + selectedProduct.getName());
		System.out.println("The number of cases you ordered is: " + count);
		System.out.println("The number of individual items you ordered is: " + String.format("%.0f", totalItems));
		System.out.println("Your Subtotal before tax is: $" + String.format("%.2f", subTotal));
		System.out.println("Your Sales Tax on these items is: $" + String.format("%.2f", tax));
		System.out.println("Your Grand Total with Tax is: $" + String.format("%.2f", grandTotal));

		}

}

Product.java

package com.company;

public class Product {

    public Product(String code, String name, int caseCount, double cost){
        _code = code;
        _name = name;
        _caseCount = caseCount;
        _cost = cost;
    }

    public String getCode()
    {
        return _code;
    }

    public String getName()
    {
        return _name;
    }

    public int getCaseCount()
    {
        return _caseCount;
    }

    public double getCost()
    {
        return _cost;
    }

    private String _code;
    private String _name;
    private double _cost;
    private int _caseCount;
}

Tax.java

package com.company;

public class Tax {

    public Tax(String state, double tax){
        _state = state;
        _tax = tax;
    }

    public String getState(){
        return _state;
    }

    public double getTax(){
        return _tax;
    }

    private String _state;
    private double _tax;

}