getCost方法是在订单类中定义的，而不是在
ShopCLI类中定义的。所以你的代码：
ord.add(new Order(1, inputOuter, inputInner, inputSauce, 0));System.out.println("You Made a " + inputInner + " with " + inputSauce + " Sandwich on " + inputOuter);System.out.println("This Will Cost " + getCost());应该改为
Order order = new Order(1, inputOuter, inputInner, inputSauce, 0);ord.add(order);System.out.println("You Made a " + inputInner + " with " + inputSauce + " Sandwich on " + inputOuter);System.out.println("This Will Cost " + order.getCost()); ^^^^^
