Possible Duplicates: which resources would you recommend for learning object oriented programming (C#)? Learning/Implementing Design Patterns (For Newbies) Hello everyone, I was working in Information Technology for few years. I was planning to learn designing / design patterns and wes really confused where to start and how t...
Hey. I've always assumed that - in the absence of constructor parameters - the parenthesis (curly brackets) follow the class name when creating a class instance, were optional, and that you could include or exclude them at your own personal whim. That these two statements were equal: $foo = new bar; $foo = new bar(); Am I right? Or ...
I'm not new to OOP, but new to PHP. I know Java, Objective-C and some other object oriented languages. So I'm looking for a comprehensive overview of how OOP looks like in PHP. ...
I am working on an interpreter for a toy language, just to learn about building an interpreter. I have already implemented a simple parser for the grammar that generates a parse tree. Now, the usual way of evaluating the parse tree would be to use polymorphism on the nodes of the parse tree, with code that looks something like below (in ...
If I create a Abstract BaseForm for my Windows application, I can use it to do common things when the application's forms are loaded. I can also override the OnLoad method, or I subscribe to the Load event (BaseForm_Load). Which approach is better from the design and performance point of view? ...
Where's the difference between self and $this-> in a PHP class or PHP method? Example: I've seen this code recently. public static function getInstance() { if (!self::$instance) { self::$instance = new PDO("mysql:host='localhost';dbname='animals'", 'username', 'password');; self::$instance-> setAttribute(PDO::ATT...
We have an entity (class) containing data and methods (lets call it Person). There are other classes that need to use the data in this object (let's call one of them Accountant), but do not need to use the functionality in it's methods. Would it be better to send the entire Person object to Accountant, or to create a new PersonData o...
I'm working on an inherited system which has some design issues which "OO Buzzwords" frown upon, and some I personally dislike. It's a stock and sales handling program for a comic book store. I have an Article class, which can be any item (Magic cards, toys), and a Publication class that inherits from Article, which represents books an...
Have the following entities in my domain: Project Task User Context A user can have multiple projects, tasks and contexts. A project can have tasks and contexts and a task can have contexts. I am a little unsure as how best to model Contexts as it will belong to multiple entities i.e. a user can add a list of contexts, these context...
In a previous job, my manager suggested use of a Translator pattern for converting data from a DataTable to objects. Basically, the Translator class had only static (i.e. class) methods so it was an aggregation of function calls. My initial approach was to implement constructors for each object that could take a DataTable row as an argum...
Is possible to create objects of an abstract class in Java ...
Hi, I'm designing some new class diagrams for extending an existing office automation application. In a special case I have an option to use extra fields on Entity1 to determine something or use additional data rows in Entity2 to determine that. I believe first approach is better because it does not force us to insert initial data while...
Is this an acceptable design ?? Abstract class public abstract class SomethingBase { public abstract int Method1(int number1); public abstract int Method2(int number2); } public class Class1 : SomethingBase { public override int Method1(int number1) { //implementation } //i dont want this method in this cla...
I've got this question about form validation and business validation. I see a lot of frameworks that use some sort of form validation library. You submit some values and the library validates the values from the form. If not ok it will show some errors on you screen. If all goes to plan the values will be set into domain objects. Here th...
In C# do properties need to reference private member variables, or can I just declare the properties and use them directly in the class code? If the former is the best practice, then does that rule out using C# property short-hand? I.e. public string FirstName { get; set; } ...
I have the foll prog class Person { var $name; function Person () { } } $fred = new Person; $fred->name = "Fred"; $barney =& new Person; $barney->name = "Barney"; echo $barney->name; echo $fred->name; both the echo statements give the right same output ie "Fred" and "Barney" so whats the use of giving & while declaring $barne...
Here's the situation: I have a custom TextBox control that contains multiple other TextBox controls. I need to turn IsTabStop off in the parent control, but I still want to expose a new IsTabStop property, which the sub-textboxes are template-bound to. I wrote the following code: using System.Windows.Controls; public class CustomTextBo...
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I'm new to MVC structure and feel it's harder to get things done because it's a new way of doing things. Are there anybody who has experience of MVC vs. pages way of doing things. Is the MVC way of doing it the holy graal now or is there still value doing ordinary object-oriented development (or even procedural pages webdev)? Is MVC a fa...
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