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Questions tagged [extends]

extends is a keyword in several programming languages used to denote implementation inheritance

extends is a keyword in several programming languages which support object-oriented programming used to denote implementation inheritance (as opposed to implements used to denote interface inheritance).

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How to access property in extended class in Coffeescript?

I want to use @Type in a if statement, but it seems as if it is not recognizing @Type. Is there a way to get @Type so that I can use it in the superclass? class opponent constructor: (ID, Level, Name) -> @ID = ID @Level = Level …
LukeK
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How do I access an array from a parent class in a child class?

I have a class where arrays are globally declared and public these arrays are initialized though methods in this class. They are not inside of a constructor. I have another class where I have used extends to allow me access to these values. Of…
handroski
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Receiving a null pointer exception

I have a class that sets up an array. Another class extends this class and uses the mentioned array in a method to return another array. I am receiving a null exception when I do this however when I set up the original array, it works just fine. Not…
handroski
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sub class does acquire the interface implemented by the superclass?

just a little question that can be stupid but i want to be sure of this. If i got 2 classes: ClassA and ClassB declared in this way public ClassA implements Usable... //Usable is an interface obviously ... public ClassB extends ClassA…
The BigBoss
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Java: If this is instanceof Something, display a variable that belongs only to Something?

Everything here is renamed and simplified. I have a parent class (normalThing) with a method that displays some data about the instance, and another class (specialThing) extending the parent to include another instance variable (addedPrice). I want…
Lenoxus
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Weird behaviour with controllers

In my current application, I've some functionality that are shared by all the UIViewControllers, like HUDs, connectivity library, tab gesture, and so on. I've thought that a good way to avoid repeating code, would be to create a controller called…
user1573607
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PDO - Extending vs Injection

I've recently migrated from using MySQL to PDO. Originally, I had a class which was a wrapper for the MySQLi object, providing some basic functions and settings I used a lot. I want to do the same thing for PDO. I want PDO to always throw exceptions…
Lokicat
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Problems with fragments and inflating from main activity

I am trying to set up a fragmented application with the IOIO (sort of like arduino) framework; The problem is when I changed the extension of the IOIOActivity.java class from extending activity to extending FragmentActivity and then I build my…
Timothy Frisch
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Extend Abstract Class with Generic Types?

How can I extent an abstract class like the following which has generic arguments? @Singleton public abstract class Presenter> extends PresenterWidget { ... }
Michael
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TCPDF import variables to extension

I'm using TCPDF and Codeigniter. I'm trying to create a custom header with information from my MYSQL-DB: $header_content. Allthough I can't import the variable into the class MYPDF without getting an error tha the variable doesn't exits. How do I…
Line in Linus
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Java: Returning an extended class given it's name

In the following code I am returning a class that extends the type of Entity given the name of the class (it then corrects it so that Class.forName can find it properly). How can I modify this so that I can still return a class that extends Entity…
Nahydrin
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ActionScript Extending Classes (Nesting ADVICE)

I've written Pacman in AS2, now I want to port it to AS3 using classes.... I'm looking for ADVICE on my approach to tackling this so far (feels like I'm going wrong already)... I've made a Console Class that holds program output and a container for…
DigiWongaDude
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Incorrect number of arguments As3

I made a class so that I can cut some from a class and store the extra code in this new class package { public class mainSetup extends Main{ public function mainSetup() { trace("I extend the main class"); } …
Jr. Mathews
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Calling a method through an extended class only works if the Method is overridden java

i have 4 classes (Core, GameMain, Spriter, Character) - GameMain extends core (core >> GameMain) - Character extends Spriter (Spriter >> Character) I get a NullPointerException if i call the - b.get...() - Methods without overriding them in…
OmAr
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How can I implements ProgressBar class?

I want to edit onDraw method for my progressbar. But in my class I use extends to Activity class. When I search on the internet I see , I should extend to ProgressBar class. But I etends activity so How can I implements ProgressBar class? my…
user3086226
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