I am designing a simple Data Access Object for my Java application. I have a few classes (records) that represents a single row in tables like User and Fruit.
Say I have a table animals that has a column parent_id Say also that I have a type_id on the table to indicate species
I want my code to be extensible, in a way where at runtime I create the objects. For example, let\'s say I have a Grocery class which has an array of fruits and I want to fill this array of fruits wi
Firstly, I know that writing a class to disk is bad, but you should see some of our other code. D: My question is: can I write a polymorphic class to disk and then read it in later and not get undefi
I have some problem with organizing classes properly. Suppose, I have some class ABase. When I want to create some different (more particular) abstraction of this class (denote it AParticular), I can
I can draw a circle, but am unable to draw a rectangle or draw a line.Can you guys see what it is that I am missing?
What is pol开发者_运维问答ymorphism? I\'m not sure I am understanding it correctly. In the Python scope, what I am getting out of it is that I can define parameters as followed:
I am writing a C++ program that will roll a die and flip a coin.I need to use inheritance and polymorphism.I have my virtual functions set up correctly.In my base class(aRandomNumberGenerator) I have
I have a polymorphic association like this - class Image < ActiveRecord::Base has_one :approval, :as => :approvable
If I write foo :: (Num a) => a foo = 42 GHC happily accepts it, but if I write bar :: (Num a) => a bar = (42 :: Int)
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