Please use java data structure(arrayStack or Linked list to do this)

Public double totalCost();

*Calculates total cost of the product in shopping list.

*Return the total cost of all products in the shopping list

*Return 0 if shopping list is empty

Public boolean removeProduct(String product);

*Remove and return true if the product was removed.

*Return false if cannot find product in the shopping list.

*Remove product name.

Public void clear();

*Clear all product in shopping list.