```java
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
class MenuItem {
private String name;
private double price;
public MenuItem(String name, double price) {
this.name = name;
this.price = price;
}
public String getName() {
return name;
}
public double getPrice() {
return price;
}
}
class Order {
private MenuItem item;
private int quantity;
public Order(MenuItem item, int quantity) {
this.item = item;
this.quantity = quantity;
}
public MenuItem getItem() {
return item;
}
public int getQuantity() {
return quantity;
}
public double getTotalPrice() {
return item.getPrice() * quantity;
}
}
class Restaurant {
private List<MenuItem> menu;
private List<Order> orders;
public Restaurant() {
menu = new ArrayList<>();
orders = new ArrayList<>();
}
public void addMenuItem(MenuItem item) {
menu.add(item);
}
public void displayMenu() {
System.out.println("Menu:");
for (int i = 0; i < menu.size(); i++) {
MenuItem item = menu.get(i);
System.out.println((i + 1) + ". " + item.getName() + " - $" + item.getPrice());
}
System.out.println();
}
public void placeOrder(MenuItem item, int quantity) {
Order order = new Order(item, quantity);
orders.add(order);
}
public void displayOrders() {
System.out.println("Orders:");
for (int i = 0; i < orders.size(); i++) {
Order order = orders.get(i);
System.out.println((i + 1) + ". " + order.getItem().getName() + " - Quantity: " + order.getQuantity() +
" - Total Price: $" + order.getTotalPrice());
}
System.out.println();
}
public double calculateTotalRevenue() {
double totalRevenue = 0;
for (Order order : orders) {
totalRevenue += order.getTotalPrice();
}
return totalRevenue;
}
}
public class RestaurantManagementSoftware {
public static void main(String[] args) {
Restaurant restaurant = new Restaurant();
Scanner scanner = new Scanner(System.in);
MenuItem item1 = new MenuItem("Burger", 9.99);
MenuItem item2 = new MenuItem("Pizza", 12.99);
MenuItem item3 = new MenuItem("Salad", 6.99);
restaurant.addMenuItem(item1);
restaurant.addMenuItem(item2);
restaurant.addMenuItem(item3);
boolean exit = false;
while (!exit) {
System.out.println("1. Display Menu");
System.out.println("2. Place Order");
System.out.println("3. Display Orders");
System.out.println("4. Calculate Total Revenue");
System.out.println("5. Exit");
System.out.print("Enter your choice: ");
int choice = scanner.nextInt();
switch (choice) {
case 1:
restaurant.displayMenu();
break;
case 2:
restaurant.displayMenu();
System.out.print("Enter item number: ");
int itemNumber = scanner.nextInt();
System.out.print("Enter quantity: ");
int quantity = scanner.nextInt();
MenuItem selectedItem = restaurant.getMenu().get(itemNumber - 1);
restaurant.placeOrder(selectedItem, quantity);
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