Hello, I need help creating these java methods.

_{public DoubleDate(String yourName, String guests)}

_{Initialize the guests instance variable by creating a new ArrayList. Give your ArrayList a default capacity of 4.}

_{Using the ArrayList add method, add your name to the ArrayList. This will insert your name in position 0 of the ArrayList.}

_{If there are any additional guests to add, use the ArrayList addAll and Arrays.asList(array) methods to add the optional guests to the ArrayList.}

_{Initialize the restaurant by calling the static Restaurant.getInstance(String name) method.}

_{Initialize the menu by calling the restaurant.getMenu() method, and then invoking the addMenuItems() method.}

_{Initialize the bill by calling the default constructor of the Bill class.}

_{Initialize the movies array by adding at least 3 movie titles to the array.}

and this method

_{public void addMenuItems()}

_{There is a method in the Menu class with the following signature:}

_{public boolean addMenuItem(String itemType, String name, double price)}

_{Using this method and the itemType values listed below, add at least 3 items of each type to your menu. Drink prices should be at least $5.00. Dessert and Appetizer prices must be evenly divisible by 2.}

_Drinks

_Desserts

_Appetizers

_Entrees

_{Menu item names should be a maximum of 30 characters in length for optimal formatting of outpout.}

I already having existing class Bill.java here

_{package dateNight;}

_{import java.util.ArrayList; import java.util.HashMap;}

_{import cst8132.restaurant.Appetizer; import cst8132.restaurant.Drink; import cst8132.restaurant.MenuItem;}

_{public class Bill {}

_{private HashMap> orders = new HashMap>(4); private boolean isHappyHour = false; private double subtotal; private double hstRate = 0.15; private final int MAX_MENU_ITEM_LENGTH = 30; public boolean addOrderItem(String guest, MenuItem item) { ArrayList o = orders.getOrDefault(guest, new ArrayList(4)); o.add(item); orders.put(guest, o); subtotal += item.getPrice();}

_{return true; } public double getHappyHourDiscount() { double happyHourDiscount = 0; if (!isHappyHour) return 0; for (ArrayList a : orders.values()) { for (MenuItem m : a) { if (m instanceof Drink) { happyHourDiscount += 2; } if (m instanceof Appetizer) { happyHourDiscount += m.getPrice() / 2; } } } return happyHourDiscount; } public String toString() { String s = ""; String format = "\t%-" + MAX_MENU_ITEM_LENGTH + "s \t $%6.2f "; for (String o : orders.keySet()) { s += "Dinner Guest: " + o + " "; for (MenuItem item : orders.get(o)) { s += String.format(format, item.getName(), item.getPrice()); } s += " "; }}

_{s += String.format(format, "Subtotal", getSubtotal()); s += String.format(format, "Happy Hour Discount", getHappyHourDiscount()); s += String.format(format, "HST " + (int) (hstRate * 100) + "%", getHst()); s += String.format(format, "Total", getTotal()); return s; } }}