ShoppingCart

import java.text.DecimalFormat;
import java.util.Scanner;

public class ShoppingCart {

	// "Attributes"
	private double taxRate;
	private double preTaxTotalPrice;
	private double totalPrice;

	// Constructor
	public ShoppingCart() {
		// Set the variables to their default values
		taxRate = 0D;
		preTaxTotalPrice = 0;
		totalPrice = 0;
	}

	// "Operations"
	public double getTaxRate() {
		// Just a simple getter
		return taxRate;
	}

	public void setTaxRate(double taxRate) {
		// Just a simple setter
		this.taxRate = taxRate;
	}

	public void getInput(Scanner scanner) {
		System.out.println("Enter the name, quantity, and price of the item."); // Prompt the user
		String name = scanner.next(); // Get first the string,
		int quantity = scanner.nextInt(); // And then the integer
		double price = scanner.nextDouble(); // And then the double
		addItem(name, quantity, price); // addItem using those three values
	}

	public void addItem(String item, int quantity, double price) {
		preTaxTotalPrice += quantity * price; // Add the price times the quantity to the pTTP
		totalPrice = preTaxTotalPrice * (1 + taxRate); // Multiple the pTTP times 1.(taxRate) to get tP
	}

	public String getPreTaxTotalPrice() {
		// I like using DecimalFormat over the way mentioned in the hint
		return "$" + new DecimalFormat("#.##").format(preTaxTotalPrice);
	}

	public String getTotalPrice() {
		// Identical to gPTTP outside of the variable being formatted
		return "$" + new DecimalFormat("#.##").format(totalPrice);
	}
}