Thread: Default Write a Java program to simulate an online shopping cart.

Hello, I need some help finishing this shopping cart java program. Here are the directions:

Project description: Write a Java program to simulate an online shopping cart.

An online shopping cart is a collection of items that a shopper uses to collect things for purchase. A shopper can add items to the cart, remove them, empty the cart, view the items in the cart, and end shopping and proceed to checkout.
Using the Java ArrayList class, you will write a program to support these functions. Each item added to the cart will be represented with the CartItem class (se attached .java files).

When your program begins, you will display a menu of actions the shopper can perform:

SHOPPING CART OPTIONS
1 add an item to your cart
2 remove an item from your cart
3 view the items in your cart
4 end shopping and go to checkout
5 empty your cart
6 exit the program

Your program will allow the shopper to add and remove items to the shopping cart. The program should continue as long as the shopper want to keep going. The shopper can exit by choosing option 6, and in this case the shopper will exit without making a purchase. The shopper can also exit by selecting option 4, and go to checkout. In this option, the program will display the amount due by adding up the cost of all the items in the cart. Use the NumberFormat class to format the amount in currency.
__________________________________________________ __________________________________________________

 
import java.util.ArrayList;
import java.util.Scanner;
import java.util.Scanner;
 
public class Shopping {
 
	/**
	 * In this program you will replicate an online shopping
	 * cart. You will use the ArrayList class to hold the
	 * items in your shopping cart.
	 * You will use the CartItem class to represent items in
	 * your shopping cart.
	 * In this driver program you will do the following:
	 * Create the shopping cart object
	 * Offer a menu of options:
	 * 1 add an item to your cart
	 * 2 remove an item from your cart
	 * 3 view the items in your cart
	 * 4 end shopping and go to checkout
	 * 5 empty your cart
	 * 6 exit the program
	 * Use the Scanner class to collect input
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		ArrayList<CartItem> shoppingCart = new ArrayList<CartItem>();
		Scanner scan = new Scanner(System.in);
		ArrayList<Integer> intList = new ArrayList<Integer>();
		boolean keepGoing = true;
		int choice = 0;
		int input = 0;
		int index=0;
		int total = 0;
		Integer item;
 
		while(keepGoing)
		{
			System.out.println("\nMenu - Managing a List");
			System.out.println("1 Add an item to your cart");
			System.out.println("2 Remove an item from your cart");
			System.out.println("3 View the items in your cart");
			System.out.println("4 Exit and add up the total");
			System.out.println("5 Empty your cart");
			System.out.println("6 Exit");
			System.out.println("Select a menu option");
			choice = scan.nextInt();
			if (choice <1 || choice >6)
			{
				System.out.println("Enter a value between 1 and 6:");
			}
			else
			{
				switch (choice)
				{
				case 1:
					//add an integer
					System.out.println("Enter an item:");
					input = scan.nextInt();
					item = new Integer(input);
					intList.add(item);
					//intList.add(input);
					break;
				case 2:
					//remove from the list
					System.out.println("Enter an item to remove:");
					input = scan.nextInt();
					item = new Integer(input);
					if (intList.contains(item))
					{
						intList.remove(item);
						System.out.println(item + " has been removed.");
					}
					else
					{
						System.out.println(item + " was not found in your shopping cart.");
					}
					break;
				case 3:
					//view the items in your cart
					System.out.println(intList);
					break;
				case 4:
					//Exit and add up the total
					for (int i = 0; i<intList.size(); i++)
					{
						item = intList.get(i);
						total = total + item.intValue();
					}
					System.out.println("Total is "+ total);
					System.out.println("Goodbye");
					keepGoing = false;
					break;
				case 5:
					//Empty the list
					intList.clear();
					break;
				case 6:
					//exit
					keepGoing = false;
					System.out.println("Goodbye");
					break;
 
				}
			}
		}
	}
}
 
 __________________________________________________ _____________________________________
 
 
public class CartItem {
	private String product;
	private int quantity;
	private double price;
 
	//constructor
	public CartItem()
	{
		product = "";
		quantity = 0;
		price = 0.0;
	}
	public String getProduct()
	{
	return product;
	}
	public double getPrice()
	{
	return price;
	}
	public int getQuantity()
	{
	return quantity;
	}
 
	//constructor with parameters
	public CartItem(String inProduct, int inQuant, double inPrice)
	{
		product = new String(inProduct);
		quantity = inQuant;
		price = inPrice;
	}
	//getter setter public methods for each instance data
	public boolean equals(CartItem item)
	{
		//write the code for the equals method
		//return true;
		boolean result = false;
		if (this.product.equalsIgnoreCase(item.getProduct()) && this.price == item.getPrice())
			result = true;
		else
			result = false;
 
		return result;
	}
 
	public String toString()
	{
		//write code for toString method
		String result="";
 
		return result;
	}
}

This is what I have so far. I need help finishing the program so it runs properly. Thanks for your help !

i believe that most of the work needs to be done in the CartItem file. I need to write getter setter public methods for each instance data, write code for toString method, and also the constructor with parameters.

When you run the program and use option 1, it immediately returns an error which I am not sure why. If you try running the program, that might help you determine the other problems.


Thank you for your help. I appreciate it !

Here is what happens when I run the program and choose option 1:

Menu - Managing a List
1 Add an item to your cart
2 Remove an item from your cart
3 View the items in your cart
4 Exit and add up the total
5 Empty your cart
6 Exit
Select a menu option
1
Enter an item:
jeans
Exception in thread "main" java.util.InputMismatchException
at java.util.Scanner.throwFor(Unknown Source)
at java.util.Scanner.next(Unknown Source)
at java.util.Scanner.nextInt(Unknown Source)
at java.util.Scanner.nextInt(Unknown Source)
at Shopping.main(Shopping.java:58)

How do I change the code to have it read a string?

Also, here is the error when I choose option 2. I assume it is the same error, but for line 66:

Exception in thread "main" java.util.InputMismatchException
at java.util.Scanner.throwFor(Unknown Source)
at java.util.Scanner.next(Unknown Source)
at java.util.Scanner.nextInt(Unknown Source)
at java.util.Scanner.nextInt(Unknown Source)
at Shopping.main(Shopping.java:66)

It gave me the error because I did not enter an integer, I entered the word "jeans"

So like you said, I have to change the code to have it read a string. How do I do that?

thanks for your help

im really not sure what that means. Could you be more specific or help provide me with the code?

thanks !

which class am i looking for?

What do i do for the getter setter methods?

i know what they are but i do not know how to apply them to this particular program. Could you show me how?

I am still trying to change the code to have it read a string. Could you please give me the code for that?

I never said I was a student. But thank you for your help. I will let you know if I have any more questions.

I am trying to figure out case 4 but I am getting this error:

5.PNG

Here is the first error I am getting:

Exception in thread "main" java.lang.Error: Unresolved compilation problems:
The constructor CartItem(String) is undefined
The constructor CartItem(String) is undefined

at Shopping.main(Shopping.java:59)

5.PNG