I need help fixing my ShoppingCartManager.java. I can't loop the menu

import java.util.Scanner;

public class ShoppingCartManager { public static void main(String[] args){ //prompt the user for a customer's name and today's date Scanner scan = new Scanner(System.in); System.out.println("Enter Customer's Name: "); String customerName = scan.nextLine(); System.out.println("Enter Today's Date: "); String currentDate = scan.nextLine(); ShoppingCart cart = new ShoppingCart(customerName, currentDate); System.out.println(); //space //Output the name and date System.out.println("Customer Name: " + cart.getCustomerName()); System.out.println("Today's Date: " + currentDate); } public static void printMenu(ShoppingCart shoppingCart, Scanner scan){ //string of menu String menu = " MENU " + "a - Add item to cart " + "d - Remove item from cart " + "c - Change item quantity " + "i - Output items' descriptions " + "o - Output shopping cart " + "q - Quit Choose an option:"; Scanner scanner = new Scanner(System.in); //User chooses option char input = scanner.next().charAt(0); scanner.nextLine(); //user input //Add item to cart if(input == 'a'){ System.out.println("ADD ITEM TO CART"); System.out.println("Enter Item Name: "); String itemName = scanner.nextLine(); System.out.println("Enter Item Description: "); String itemDescritpion = scanner.nextLine(); System.out.println("Enter Item Price: "); int itemPrice = scanner.nextInt(); System.out.println("Enter Item Quantity: "); int quantity = scanner.nextInt(); scanner.nextLine(); } //Remove item from cart else if(input == 'd'){ System.out.println("REMOVE ITEM FROM CART"); System.out.println("Enter name of item to remove: "); String name = scanner.nextLine(); } //Change item quantity else if(input == 'c'){ System.out.println("CHANGE ITEM QUANTITY"); System.out.println("Enter the item name: "); String name = scanner.nextLine(); System.out.println("Enter the new quantity: "); int quantity = scanner.nextInt(); ItemToPurchase item = new ItemToPurchase(); item.setName(name); item.setQuantity(quantity); } //Output items' descriptions else if(input == 'i'){ System.out.println("OUTPUT ITEMS' DESCRIPTIONS"); } //Output shopping cart else if(input == 'o'){ System.out.println("OUTPUT SHOPPING CART"); } //Quit else if(input == 'q'){ } else { System.out.println(menu); } } }

here is ItemsToPurchase.java

public class ItemToPurchase { //Private fields private String itemName; private String itemDescription; private int itemPrice; private int itemQuantity; public ItemToPurchase() { //Default constructors this.itemDescription = "none"; this.itemName = "none"; this.itemQuantity = 0; this.itemPrice = 0; } //Parameterized constructor to assign name,descptn, price, quanitity public ItemToPurchase(String itemName, String itemDescription, int itemPrice, int itemQuantity) { //"this" refers to the object that is calling the method in the first place/reference this.itemDescription = itemDescription; this.itemName = itemName; this.itemPrice = itemPrice; this.itemQuantity = itemQuantity; } //Public member methods public String itemDescription() { return itemDescription; } //Outputs the item name followed by the quantity, price, and subtotal public void printItemCost() { System.out.println(itemName + " " + itemQuantity + " @ " + itemPrice + " = $" + (itemQuantity * itemPrice)); } public void printItemDescription() { System.out.println(itemName + " " + itemDescription); } public void setDescription(String itemDescription) { this.itemDescription = itemDescription; } public String getDescription(){ return itemDescription; } public String getName() { return itemName; } public void setName(String itemName) { this.itemName = itemName; } public int getPrice() { return itemPrice; } public void setPrice(int itemPrice) { this.itemPrice = itemPrice; } public int getQuantity() { return itemQuantity; } public void setQuantity(int itemQuantity) { this.itemQuantity = itemQuantity; } }

here is ShoppingCart.java

import java.util.ArrayList; import java.util.Scanner;

public class ShoppingCart { //Private fields private String customerName; private String currentDate; private ArrayList cartItems = new ArrayList();; public ShoppingCart() { //default constructor customerName = "none"; currentDate = "January 1, 2016"; } //Parameterized constructor which takes customer name and date as paramenters public ShoppingCart(String CustomerName, String CurrentDate) { this.currentDate = CurrentDate; this.customerName = CustomerName; //Field member Parameter } //Public member methods public String getCustomerName() { //accessor return customerName; } public void setCustomerName(String customerName) { this.customerName = customerName; //Field member Parameter } public String getDate() { //accessor return currentDate; } public void setDate(String currentDate) { this.currentDate = currentDate; //Field member Parameter } //Adds an item to cartItems array. Has parameter ItemToPurchase. Does not return anything. public void addItem(ItemToPurchase ItemToPurchase) { this.cartItems.add(cartItems.size(), ItemToPurchase); } //Removes item from cartItems array. Has a string (an item's name) parameter. Does not return anything. public void removeItem(String ItemToRemove) { int count = 0; for(int i = 0; i < cartItems.size(); ++i){ if(cartItems.get(i).getName().equalsIgnoreCase(ItemToRemove)){ cartItems.remove(i); ++count; } } if(count == 0){ System.out.print(" Item not found in cart. Nothing removed."); } } //Modifies an item's description, price, and/or quantity. Has parameter ItemToPurchase. Does not return anything. public void modifyItem(ItemToPurchase itemToPurchase) { int count = 0; for(int i = 0; i < cartItems.size(); ++i){ if(cartItems.get(i).getName().equals(itemToPurchase.getName())){ cartItems.get(i).setQuantity(itemToPurchase.getQuantity()); ++count; } } if(count == 0){ System.out.println(" Item not found in cart. Nothing modified."); } } //Returns quantity of all items in cart. Has no parameters. public int getNumItemsInCart() { int numItems = 0; for(int i = 0; i < cartItems.size(); ++i){ numItems = numItems + cartItems.get(i).getQuantity(); } return numItems; } //Determines and returns the total cost of items in cart. Has no parameters. public int getCostOfCart() { int total = 0; for(int i=0; i < cartItems.size(); ++i){ total = total + (cartItems.get(i).getPrice()*cartItems.get(i).getQuantity());; } return total; } //Outputs total of objects in cart. public void printTotal(){ for(int i = 0; i < cartItems.size(); ++i){ //System.out.print(cartItems.get(i).printItemCost()); } System.out.println(); } //Outputs each item's description. public void printDescriptions() { System.out.println("Item Descriptions"); for(int i = 0; i < cartItems.size(); ++i){ //System.out.println(cartItems.get(i).printItemDescription()); } } }