Can anyone solve this problem use java with given grocerybill class?

should have 5 classes include grocery bill class. (item, employee,discountBill,discountBillTester and GroceryBill)

10. DiscountBill. Suppose a class GroceryBil1 keeps track of a list of items being purchased at a market: Constructs a grocery bill object for the given clerk public GroceryBill(Employee clerk) Adds the given item to this bill public void add(Item i) Returns the total cost of these items public double getTotal() public void printReceipt () Prints a list of items Grocery bills interact with Item objects, each of which has the public methods that follow. A candy bar item might cost 1.35 with a discount of 0.25 for preferred customers, meaning that preferred customers get it for 1.10. (Some items will have no discount, 0.0.) Currently the preceding classes do not consider discounts. Every item in a bill is charged full price, and item discounts are ignored. Returns the price for this item public double getPrice() Returns the discount for this item public double getDiscount() Define a class DiscountBill that extends GroceryBill to compute discounts for preferred customers. Its constructor accepts a parameter for whether the customer should get the discount. Your class should also adjust the total reported for preferred customers. For example, if the total would have been $80 but a preferred customer is getting $20 in discounts, then getTotal should report the total as $60 for that customer. Also keep track of the number of items on which a customer is getting a nonzero discount and the sum of these discounts, both as a total amount and as a percentage of the original bill. Include the extra methods that follow, which allow a client to ask about the discount. Return 0.0 if the customer is not a preferred customer or if no items were discounted. Constructs bill for given clerk public DiscountBill (Employee clerk, boolean preferred) public int getDiscountCount () Returns the number of items that were discounted, if any public int getDiscountCount () Returns the number of items that were discounted, if any Returns the total discount for this list of items, if any public double getDiscountAmount ( ) public double getDiscountPercent () Returns the percent of the total discount as a percent of what the total would have been otherwise public class GroceryBill { private double total_price; private int item_count; private Item receipt [); private Employee clerk; public GroceryBill(Employee clerk) { // Constructor with Employee parameter total_price = 0; item_count = 0; receipt = new Item (25]; this.clerk = clerk; %3D public void add(Item i) { // Mutator method for adding an item total_price += i.getPrice(); receipt [item_count] = i; item_count += 1; // Accessor methods public double getTotal () { return total_price; public int getItemCount() 1 return item_count; public String getCashierName() { return cierk.getName ( ); public void printReceipt() { // Printing the bill System.out.println(receiptToString()); System.out.println("Cashier Name: System.out.print ln ("Total: $" + this.getTotai()); + clerk.getName ()); %3D