Most voted "inheritance" questions
In object-oriented programming, inheritance is the system that allows objects to support operations defined by previous types without having to provide their own definition. She is the main vector for polymorphism.
Learn more…245 questions
Sort by count of
-
1
votes2
answers80
viewsUse get_object_vars in a child class
I got the following class: class Dominio { private $teste; public function getAtributos() { return get_object_vars($this); } } And other classes that inherit it it(Dominio): class ClasseQualquer…
-
1
votes1
answer1531
viewsHow to use more than one extends?
When I create the project it comes like this public class MainActivity extends AppCompatActivity{ would like to use more of a extends how to do ? import android.support.v7.app.AppCompatActivity;…
-
1
votes3
answers450
viewsAccess modifier protected
A common class (which is not subclass) and has no inheritance, can use an attribute protected of a superclass that has a subclass? If so, this attribute will be visible (no need to use the…
-
1
votes1
answer89
viewsInheritance in Rails
I’m starting in the area, I have the following scenario in my back end done in Rails: I want to implement a parent class: Equipment: PK ID Brand ... And some child classes Printer: ID_EQUIPAMENTO PK…
-
1
votes1
answer38
viewsIn this case below, wouldn’t the login attribute have to be set as private for the method?
I am studying inheritance in Java and one of the exercises has the code below, I think, the login attribute would not have to be set as private for the method? public class Gerente extends…
-
1
votes1
answer262
viewsConstructor method in inheritance classes
Using Python3, as would the constructor method of the class Z? class W: def __init__(self, atributo1): self.atributo1 = atributo1 def metodo1(self): print("Metodo1") class X(W): def __init__(self,…
-
1
votes1
answer69
viewsHow to pass the class (Teste2 teste2) as reference in the ("super") C++ constructor?
On the basis of that reply In C++ what command corresponds to super() of Java? Class Teste2{ int x; int y; public: Teste2(int x, int y){ . . . } } class Testando{ Teste2 *teste2; public:…
-
1
votes2
answers261
viewsInheritance in the Entity Framework
I am now reading about cross domain inheritance in EF. I came across this example: public abstract class BillingDetail { public int BillingDetailId { get; set; } public string Owner { get; set; }…
-
1
votes0
answers92
viewsHow to make inheritance with Javascript / jQuery
I have a question about how to use inheritance with Javascript / jQuery (if possible), I did a search but found confusing materials of gringos who could not help me. Let’s go to the classic example…
-
1
votes1
answer139
viewsUse of delete Function - Inheritance of a Qlist
When compiling I get the following error, in Qlist. I’m using Qt 5.6. error: use of Deleted Function 'Vitamin::Vitamin(const Vitamin&)' Current->v = new T(*reinterpret_cast(src->v));…
-
1
votes2
answers849
viewsCatch instance of daughter class
I have a class: class Children extends Database Soon, Children is the daughter class and Database the parent class, in the parent class I have the attribute: protected $object = null; The value of…
-
1
votes1
answer84
viewsAre inheritance derived classes different tables in Mysql?
If I use inheritance and have 4 derived classes and my parent class is abstract, these 4 derived classes will each have a different table in the Mysql database?
-
1
votes1
answer1846
viewsJava Academic System
Hello. I need help to build a Java program with the following specifications: 1) Read, from the user, the following items: Name(String), Age(int), gender(char[M or F]), telephone(String),…
-
1
votes1
answer2329
viewsJava creation of Register
I am creating an academic system in Java, but I have a problem. I have 4 classes (Principal, Pessoa, Aluno and Professor). I believe it is something simple, the error that appears is in the class…
-
1
votes1
answer126
viewsInheritance problem with HIBERNATE
Well, my problem is this, I have an abstract class Official and two subclasses Attendant and Dentist inherited. I also have a class User, which has as attributes login, ... , .... , ... and an…
-
1
votes3
answers347
viewsForm Inheritance created in Runtime
Follow the code below: type TfObject = class(TForm) private procedure FormShow(Sender : TObject); procedure FormKeyDown(Sender: TObject; var Key: Word; Shift: TShiftState); procedure…
-
1
votes1
answer112
viewsHow is the signature check of the super function
The function super() serves to call the parent builder and verify suitable signatures. public class Pessoa { private String nome; private String endereco; private String telefone; private String…
-
1
votes1
answer69
viewsHeritage Mapping Type per Type Asp.Net
In my project, I have a type of heritage that I have mastered by TPT. Analyzing the documents and several examples I can’t identify where I’m going wrong, because the mapping is apparently correct,…
-
1
votes2
answers3232
viewsAssign one class to another in C++
There is a class as below: class vetor { protected: int x, y; public: //Construtor vetor(int _x=0, int _y=0); }; and another: class pos : public vetor { public: //Construtor pos();…
-
1
votes1
answer294
viewsImplementing the concept of inheritance in a database
Why the attribute PessoaJuridicaId is not generated? This is the base class Pessoa: public class Pessoa { public Pessoa() { DataCadastro = DateTime.Now; } public int PessoaId { get; set; } public…
-
1
votes0
answers45
viewsMy class "Playerbehavior" is not inheriting the other class "Characterbase"
I’m not getting access to the class CharacterBase of my Script PlayerBehavior using System.Collections; using System.Collections.Generic; using UnityEngine; public enum TypeCharacter{ Priest = 0,…
-
1
votes0
answers212
viewsInheritance attributes using abstract class
I’m looking to use inheritance with parent class being abstract. The point is that I’m using the toString() superscript so that each print of child classes can print their respective data. But when…
-
1
votes1
answer288
viewsI have a question about inherited default builders
I am doubtful when trying to improve a POO exercise here.. (-) = without I have the PAI class with two constructors (one is default). In the FILHO class I have two more constructors (no-default). In…
-
1
votes1
answer82
viewsClasses with operations extending another class
I have a class called cliente class cliente { private $id; private $nome; function getId() { return $this->id; } function getNome() { return $this->nome; } function setId($id) { $this->id =…
-
1
votes3
answers110
viewsHow to call the same method with different arguments but inherited from the same mother class?
I have two classes (ColunaDoGrafico and ColunaDoRelatorio) extending from Coluna. My Column class has the following structure: public class Coluna { protected String tipoFiltro; protected boolean…
-
1
votes2
answers165
viewsCalling the method of a specific superclass
Suppose I have the following hierarchical structure in Java: First a class Avo: public class Avo { protected String nome; public void falar() { //Codigo aqui } } Next I have a class Pai who inherits…
-
1
votes1
answer942
viewsHow to access parent class attributes in PHP?
How do I access the parent class attributes once I instated the child? Direct access $Filho->atributoPai doesn’t work. Access by function $Filho->getterPai doesn’t work. For every inherited…
-
1
votes1
answer177
viewsInheritance class: error TS2554: Expected 5 Arguments, but got 0
I have two classes in Angular 4 that are related by inheritance, however in doing the build makes a mistake: error TS2554: Expected 5 Arguments, but got 0. Pai Class: constructor(protected http:…
-
1
votes2
answers104
viewsUse/change property of an extended class and print by instance
Example scenario Root folder Classea.php Classeb.php index php. Filing cabinet: classeA.php class ClasseA { public $retorno = null; public $error = "Erro desconhecido"; function __construct { $this…
-
1
votes1
answer260
viewsUpcasting and Downcasting
I know that Upcasting is to convert a subclass object to the superclass and Downcasting is to convert a superclass object to the subclass. But in relation to the loss of values and the like, as it…
-
1
votes0
answers12
viewsEmbedding blocks into other blocks is not supported
I have developed a Volt template and intend to use it as a default for others. There is an example of my code below: {# LOCKED MODE #} {% if session.get('locked_mode', true) is not empty and…
-
1
votes0
answers32
viewsHow to deal with Scala x Java classcasting
I’m having a problem working with heritage between Scala and Java. To contextualize, follow an example that reflects my problem. Java Class public class Animal { } Java Class public class Cat…
-
1
votes2
answers245
viewsHow to make a Class property of another Class? C#
I am doing a job of the facul that is for control of fleet of vehicles, I created a class Travel and I tried to put the classes Driver and Vehicle in this class. public Motorista {get; set;} public…
-
1
votes1
answer163
viewsChange super class value using subclass method
The method sacar() does not work, does not change the value of the balance. I make the deposit using super class method ContaBancaria direct, the sacar() is of class ContaPoupanca that extends the…
-
1
votes1
answer143
viewsWhat is the need to declare the constructor/super of an extended class?
I have a class, example: class Animal { constructor(raca) { this._raca = raca; } get raca() { return this._raca; } printRaca = function() { console.log(this._raca); } } And then I extend it this…
-
1
votes2
answers77
viewsIf an A class is an implementation of an X interface, will the subclasses of A also be?
With the interface Posicionavel: package projeto; public interface Posicionavel { public boolean mesmaPosicao(Posicionavel p); public boolean mesmaPosicao(int[] x); public int[] posicoes(); } And…
-
1
votes1
answer50
viewsIs it possible to create a Java superclass for basic CRUD functions using spring framework?
While working recently on a project, I noticed that we have several classes with basic CRUD and repeating functions, their only differences, would be some parameters, responses and function calls in…
-
1
votes0
answers141
viewsInterface and heritage in Xamarin - System.Invalidcastexception: Specified cast is not Valid
Greetings! I’m developing a Cross Platform project in Xamarin. This project consists of consuming a web-service method that will return the script code and an address array that corresponds to the…
-
1
votes1
answer53
viewsHow to access mother class fields through inheritance?
Simplifying what I mean, suppose I have a Mother class: public class Mãe { private String nome; // Declarando o campo privado nome public Mãe(String _nome) { nome = _nome; // Definindo o campo nome…
-
1
votes2
answers103
viewsMemory organization when there is inheritance
When I declare funcionario as Pessoa in the main(), where the attribute value "goes" to salario, since the class Pessoa does not have that attribute? public abstract class Pessoa { private String…
-
1
votes3
answers103
viewsAm I doing polymorphism the right way?
I have a major sales class, and other subclasses that would inherit the sales class. I thought of using polymorphism, in addition to using common methods as inheritance, I thought of injecting…
-
0
votes2
answers1147
viewsHow to Inherit Models in Laravel 4
Whereas you have the Models Pessoa and Usuario, and that a Usuario is a Pessoa (Usuario extends Pessoa), or Usuario belongsTo Pessoa and Pessoa hasOne Usuario. It is possible that the Usuario has…
-
0
votes1
answer643
viewsPopular C# datagridview with inheritance class
Good people, I have the following situation: public class TiposMateriais { public int tipoCodigo { get; set; } public string tipoDescricao { get; set; } } public class Materiais { public int…
-
0
votes1
answer356
viewsVisual Heritage of Windows Form
I am making a base form with all the components I need to perform a CRUD, and for example, when I create the customer registration form, I will inherit the base class and so show up all the basic…
-
0
votes3
answers2201
viewsHow one class can inherit from one interface and another class in Delphi
I’m creating a small persistence class using RTTI. I created the attributes of fields separated by type Ex: Fieldstring[], Fieldinteger[] and etc.. At a certain point I need to go through the…
-
0
votes2
answers86
viewsChange type of return
How do I change the return type of a mother class function in the daughter class? For example: class Mother { public: void Get() {} }; template <typename Type> class Child : public Mother {…
-
0
votes0
answers166
viewsCreate an object instance by Activator.Createinstancefrom C#
I need to instantiate the Paismapper class with the following scenario. DLL running: Projeto.ERP.Desktop In Formuláriopal I execute the method…
-
0
votes2
answers425
viewsClass association or inheritance?
What better way to create an association or heritage where I have the class User and the class Academic whereas Academic is a User User-class: public class Usuario { public int Id { get; set; }…
-
0
votes3
answers1127
viewsHow to add Toolbar in Activity without inheriting Appcompatactivity - Android Studio 1.4
Good night. I updated my Android Studio for version 1.4 and by default, any activity used as an inheritance to AppCompatActivity (public class MainActivity extends AppCompatActivity). I developed an…
-
0
votes0
answers640
viewsHow to use super in java?
I know the basics of super, but for example : If I have a class mae Person with attributes name, age and sex, and a class daughter Student with attributes course, enrollment and period, and a class…