In Java, having two interfaces: public interface SomeAbstractResult {} public interface SomeInterface { Collection<SomeAbstractResult> someMethod(); SomeAbstractResult someMethod2(); } ...

I have tried using both base class and interface and in both instances I am told a constructor that takes my arguments does not exist. I have two classes that are related to each other and I want to ...

Body: I am learning Multiple Inheritance in Python. In my code, I am initializing the parent classes by calling them explicitly by name, like this: I read that I should use super(), but when I use ...

Somewhat similar to this question, I have something like this: class DerivedA: public Base { void operation(const Base& x, const Base& y) override // pure virtual in Base { ...

I am having trouble wrapping my head around subclass mappings. I have 3 classes: @Data public class Parent { long id; String name; public boolean isEmpty() { return StringUtils.isEmpty(name)...

Explain please why the output is "Base" ? Isn't getClassName method inherited? class Base {     public String className = "Base";     public String getClassName() {         ...

I'm getting a TypeInitializationException when running this C# code. It happens when a constructor tries to add an instance to a static list that should already be initialized. You can run it here: ...

I have a base class and multiple derived classes: public class Camera { } public class CameraManufacturerA : Camera { } public class CameraManufacturerB : Camera { } public class ...

I'm building a Qt wrapper for RtMidi. As starting point I created two separate classes QMidiOut and QMidiIn that wrap RtMidiOut and RtMidiIn. I don't want to duplicate code for the common methods (e.g....

class parent{ private String x = "Parent"; public void printmsg() { System.out.println("value is "+ this.x); } } public class child extends parent{ ...

I'm trying to wrap a C++ class using SWIG that involves multiple inheritance and another class with a method returning a shared pointer to a class declared as an interface in SWIG. Here is a ...

I want to use manim to render a spiral, which is crucial for later animation. Even the output says that the first arrow's module is greater than the second arrow, the render result says that the first ...

I'm using Python decorators to implement common functionality across multiple classes. The problem comes when I want the decorated classes to inherit from each other: super() doesn't seem to delegate ...

After upgrading from Hibernate 5 to Hibernate 6, a native query that used to work now fails with an “ORA-17006: Invalid column name” error. Entity definitions Base class: @Entity @Table(name = "...

I'm making it using multi inheritance with a pair struct that contains an index and the type of the element in a recursive structure like this: template<int index, typename... ts> struct ok; ...