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@Data
public static class Order {
    // 餐桌号
    private int diningTable;
    // 菜品
    @Getter
    private final Map<String, Integer> foodDir = new HashMap<>();
    public void addFoodDic(String name, int num) {
        foodDir.put(name, num);
    }
}

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public static class Waiter {
    private final List<Command> commands = new ArrayList<>();
    public void setCommand(Command cmd) {
        commands.add(cmd);
    }
    public void orderUp() {
        System.out.println("美女服务员：大厨，新订单来了。。。。");
        for (Command command : commands) {
            if (command != null) {
                command.execute();
            }
        }
    }
}

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public interface Command {
    void execute();
}

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@AllArgsConstructor
public static class OrderCommand implements Command {
    private Receiver receiver;
    private Order order;
    public void execute() {
        System.out.println(order.getDiningTable() + "桌的订单：");
        try {
            Thread.sleep(5000);
        } catch (InterruptedException e) {
            throw new RuntimeException(e);
        }
        order.getFoodDir().forEach((k, v) -> receiver.makeFood(k, v));
        System.out.println(order.getDiningTable() + "桌的饭准备完毕！！！");
    }
}

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public static class Receiver {
    public void makeFood(String name, int num) {
        System.out.println(num + "份" + name);
    }
}

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Waiter request = new Waiter();
Receiver receiver = new Receiver();

Order order1 = new Order();
order1.setDiningTable(1);
order1.addFoodDic("西红柿鸡蛋面", 1);
order1.addFoodDic("小杯可乐", 2);
request.setCommand(new OrderCommand(receiver, order1));

Order order2 = new Order();
order2.setDiningTable(3);
order2.addFoodDic("尖椒肉丝盖饭", 1);
order2.addFoodDic("小杯雪碧", 1);
request.setCommand(new OrderCommand(receiver, order2));

request.orderUp();

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美女服务员：大厨，新订单来了。。。。
1桌的订单：
1份西红柿鸡蛋面
2份小杯可乐
1桌的饭准备完毕！！！
3桌的订单：
1份尖椒肉丝盖饭
1份小杯雪碧
3桌的饭准备完毕！！！