inheritance Questions
2
Solved
I'm building an HTTP API and I factored out a lot of code into a superclass that handles requests to a collection of objects. In my subclass, I specify what database models the operation should wor...
Purvis asked 16/8, 2016 at 1:12
2
Solved
I was just playing around with event listeners with DOM and Javascript and did notice this:
function chained(msg) {
console.log(msg, event);
}
function onClick() {
chained('the body was clicked'...
Elma asked 21/6, 2011 at 13:58
6
I'm developping a Windows app based on the Windows Form template. I'm using .NET 3.5 version. In this app, the goal is that all the visual settings of the different forms can be managed from the Ap...
Kendrick asked 18/7, 2014 at 9:35
13
Solved
I am asking a quite simple question, but I am bit confused in this.
Suppose I have a class Parent:
public class Parent {
int name;
}
And have another class Child:
public class Child extends Pare...
Battista asked 28/8, 2012 at 12:49
8
Solved
I'm working in a web app framework, and part of it consists of a number of services, all implemented as singletons. They all extend a Service class, where the singleton behaviour is implemented, lo...
Surcharge asked 27/6, 2010 at 2:5
1
Solved
I asked a question about how to implement a spark dataset with case class inheritance (see Spark Dataset with case class inheritance) and got a helpful reply to use org.typelevel.frameless to injec...
Khano asked 18/4, 2024 at 17:27
3
Solved
Consider such code:
class A ():
name = 7
description = 8
color = 9
class B(A):
pass
Class B now has (inherits) all attributes of class A. For some reason I want B not to inherit attribute '...
Ostracon asked 9/9, 2010 at 7:32
1
Solved
I'd like to be able to store different related types in a Spark DataFrame but work with strongly typed case classes via a DataSet. E.g. say I have a Base trait and two case classes A and B that ext...
Freidafreight asked 15/4, 2024 at 21:18
3
I am using table-per-hierarchy (TPH) inheritance in Entity Framework. Now I am looking to get a list of - in this example - Departments where departments can be a sub-type. I'd like the items in th...
Germanic asked 23/12, 2014 at 15:47
2
I'm trying to figure out how to create custom groups in Django, in way that groups are related to application and not to a Project.
For example when a user want to create a company, it should be t...
Kielty asked 14/7, 2016 at 13:41
3
Solved
I've extended JobService as such:
public class MyJobService extends JobService {
@Override
public boolean onStartJob(JobParameters params) {
return false;
}
@Override
public boolean onStopJ...
Polk asked 26/12, 2020 at 16:54
15
Solved
Data classes seem to be the replacement to the old-fashioned POJOs in Java. It is quite expectable that these classes would allow for inheritance, but I can see no convenient way to extend a data c...
Superannuate asked 18/10, 2014 at 20:18
5
Solved
I'm playing with Python Class inheritance and ran into a problem where the inherited __init__ is not being executed if called from the sub-class (code below) the result I get from Active Python is:...
Eijkman asked 29/5, 2009 at 20:28
6
Solved
I am a n00b in node, and find util.inherits() very useful, except for the fact that it seems to replace the entire prototype of the original object. For instance:
var myClass = function(name){
th...
Ilan asked 20/11, 2012 at 13:51
3
Solved
I managed to reproduce this on both Python 3.4 and 3.7.
Consider:
class Comparable:
def _key(self):
raise NotImplementedError
def __hash__(self):
return hash(self._key())
def __eq__(self, ...
Posen asked 28/11, 2018 at 11:59
36
Why prefer composition instead of inheritance? What trade-offs are there for each approach? And the converse question: when should I choose inheritance instead of composition?
Bracket asked 8/9, 2008 at 1:58
15
Solved
In the section about inheritance in the MDN article Introduction to Object Oriented Javascript, I noticed they set the prototype.constructor:
// correct the constructor pointer because it points t...
Hydrastinine asked 10/12, 2011 at 2:12
6
Solved
Here is some C++ code:
#include <iostream>
using namespace std;
class m
{
public:
m() { cout << "mother" << endl; }
};
class n : m
{
public:
n() { cout << "daughter" ...
Epanaphora asked 1/7, 2010 at 9:41
14
Solved
I implemented this code:
class A {
//some code
}
class B extends A {
// some code
}
class C {
public static void main(String []args)
{
B b1 = (B) new A();
A a1 = (B) new A();
}
}
Both of...
Natatory asked 20/6, 2013 at 15:40
14
Solved
If class B and class C extend class A and I have an object of type B or C, how can I determine of which type it is an instance?
Vitrify asked 12/2, 2009 at 15:18
2
Solved
Please find the schemas in my contract yaml file :
Foo:
allOf:
- $ref: "#/components/schemas/Bar"
properties:
ancestors:
items:
$ref: "#/components/schemas/Bar"
type: arr...
Doolittle asked 18/3, 2022 at 14:39
3
Solved
I was wondering if there are any (runtime) difference if I implement an interface on a derived class if the base abstract class implements it already abstract:
public interface IFoo
{
void Bar();...
Buonomo asked 12/4, 2016 at 8:54
2
Solved
Let's say I want to create an abstract base class called Document. I want the type checker to guarantee that all its subclasses implement a class method called from_paragraphs, which constructs a d...
Plot asked 26/1, 2024 at 18:48
6
Lets say I have
class Super():
def method1():
pass
class Sub(Super):
def method1(param1, param2, param3):
stuff
Is this correct? Will calls to method1 always go to the sub class? My plan is...
Edla asked 17/5, 2011 at 17:23
6
Solved
I have two classes, Field and Background. They look a little bit like this:
class Field( object ):
def __init__( self, a, b ):
self.a = a
self.b = b
self.field = self.buildField()
def buildF...
Marx asked 7/10, 2012 at 0:11
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