Follow the following two java.class. creates the new java (ArrayBag.java and item.java) that drives them

public interface BagInterface { /** Gets the current number of entries in this bag. @return The integer number of entries currently in the bag. */ public int getCurrentSize(); /** Sees whether this bag is empty. @return True if the bag is empty, or false if not. */ public boolean isEmpty(); /** Adds a new entry to this bag. @param newEntry The object to be added as a new entry. @return True if the addition is successful, or false if not. */ public boolean add(T newEntry); /** Removes one unspecified entry from this bag, if possible. @return Either the removed entry, if the removal. was successful, or null. */ public T remove(); /** Removes one occurrence of a given entry from this bag, if possible. @param anEntry The entry to be removed. @return True if the removal was successful, or false if not. */ public boolean remove(T anEntry); /** Removes all entries from this bag. */ public void clear(); /** Counts the number of times a given entry appears in this bag. @param anEntry The entry to be counted. @return The number of times anEntry appears in the bag. */ public int getFrequencyOf(T anEntry); /** Tests whether this bag contains a given entry. @param anEntry The entry to find. @return True if the bag contains anEntry, or false if not. */ public boolean contains(T anEntry); /** Retrieves all entries that are in this bag. @return A newly allocated array of all the entries in the bag. Note: If the bag is empty, the returned array is empty. */ public T[] toArray(); } // end BagInterface

package shopping_cart; public class OnlineShopper { public static void main(String[] args) { Item[] items = {new Item("Bird feeder", 2050), new Item("Squirrel guard", 1547), new Item("Bird bath", 4499), new Item("Sunflower seeds", 1295)}; BagInterface shoppingCart = new ArrayBag<>(); int totalCost = 0; // Statements that add selected items to the shopping cart: for (int index = 0; index < items.length; index++) { Item nextItem = items[index]; // Simulate getting item from shopper shoppingCart.add(nextItem); totalCost = totalCost + nextItem.getPrice(); } // end for // Simulate checkout while (!shoppingCart.isEmpty()) System.out.println(shoppingCart.remove()); System.out.println("Total cost: " + "t$" + totalCost / 100 + "." + totalCost % 100); } // end main } // end OnlineShopper /* Sunflower seeds $12.95 Bird bath $44.99 Squirrel guard $15.47 Bird feeder $20.50 Total cost: $93.91 */

When you have completed the above java, please answer the following questions. thanks

• What have you learned by completing the coding?
• What challenges did you encounter, if any?
• Anything else you would like to share?
• addition, ask a probingquestion (or two) to consider.