Can someone please answer this??? It keeps saying I didn't add a new method to shopping cart!

Hey John,

What this challenge is wanting you to do is add a new method addCart (We are keeping the old method the same) that takes only a Product as an argument, much like the original method did. Instead of writing out the same method that's already been defined, we can put in the body of the method the already previously defined addCart method that did take an int argument, it would look something like below.

We can do this by

  public void addItem(Product item) {
    addItem(item, 1);
}

This is called method overloading, basically what that means is that Java will see addItem(Product item, int Quanity) and addItem(Product item) as two unique methods, because they take different argument parameters, which is actually very useful.

Also be sure to uncomment the line cart.addItem(dispenser); in the Example.java

So here's what ShoppingCart.java should look like once we're done.

public class ShoppingCart {

  public void addItem(Product item, int quantity) {
    System.out.printf("Adding %d of %s to the cart.%n", quantity, item.getName());
    /* Other code omitted for clarity */
  }
  public void addItem(Product item) {
    addItem(item, 1);
}
}

So what did we accomplish with this? Well, say a user just wants to add a single item addItem(apple); It would add it to the cart with the assumed quantity of one. This also makes the program more user friendly instead of throwing an error message if the user forgets to add a quantity. On top of that it gives the user freedom, they can also type in addItem(apple, 10); if they want multiples of them. Both of these commands would pass since we have a method prepared for both situations.

Thanks, let me know if this doesn't help.