1. Create a Bag interface using the example in the lesson. Implement it in a ShoppingCart class for storing the items in the cart for online shopping. Test all the methods of the class in a CreateCart demo code.

2. Implement the bag interface in PiggyBank class for adding coins and money in the piggy bank. Test all the methods of the class in a demo code.

public class OnlineShopper public static void main(String[] args) Item[] items {new Item("Bird feeder", 2050) new ItemC"Squirrel guard", 1547), new Item("Bird bath", 4499), new Item("Sunflower seeds", 1295)}; BagInterface shoppingCart new BagO; int totalCost-0; // Statements that add selected items to the shopping cart: for (int index0; index