inheritance

问题 Here's the simplified parts of code that I have: abstract class DataManager<TValue> { protected static Dictionary<string, TValue> Values; } and then I have: class TextManager : DataManager<string> { static TextManager() { Values = ... // Fill with data } } And, now I'm getting CA1810. I see a few solutions, like making Values public and setting them elsewhere, but I don't like that, or making a static method in TextManager to do the same thing, but is invoked when the program starts, but I

问题 Here's the simplified parts of code that I have: abstract class DataManager<TValue> { protected static Dictionary<string, TValue> Values; } and then I have: class TextManager : DataManager<string> { static TextManager() { Values = ... // Fill with data } } And, now I'm getting CA1810. I see a few solutions, like making Values public and setting them elsewhere, but I don't like that, or making a static method in TextManager to do the same thing, but is invoked when the program starts, but I

问题 There are two type of statements on internet about Interface , that is Statement A Interfaces do not come in inheriting chain. other statement B Interfaces can inherit other interfaces These two are contradicting statements. Please tell me which one is right? 回答1: They are both true, sort of. Statement A: Interfaces don't strictly inherit. If you have a class that implements an interface, and you say base. You won't see members of the interface. Statement B: This would read better as

问题 I have a parent and child class. class a { val name :String = "jo" def extract(){ println(name) } } now i need to do as below. class b extends a { override def extract(){ override var name :String = "dave". //the problem is here and super.extract() name = "jenny" //here super.extract() } } Issues Im facing now. 1) I cannot use var if im to override the value in class a, needs to be immutable to use override. 2) needs to call the super function twice with different variable. 3) Cannot call

问题 I have a parent and child class. class a { val name :String = "jo" def extract(){ println(name) } } now i need to do as below. class b extends a { override def extract(){ override var name :String = "dave". //the problem is here and super.extract() name = "jenny" //here super.extract() } } Issues Im facing now. 1) I cannot use var if im to override the value in class a, needs to be immutable to use override. 2) needs to call the super function twice with different variable. 3) Cannot call

问题 I'm currently working with a 3Rd party app. This 3rd party app has thoses class defined : class VeryBaseClass(object): def __init__(): pass class BaseClass(VeryBaseClass): def specific_method(): pass And then, looots of theses: class Componenent[1,2,3,4....129883](BaseClass): def other_specific_method(): pass I can't modify any of these classes . So , for me to override/supplement methods here, I just have to create a class that inherits from Component, where I can change the methods

问题 I have a very basic question concerning inheritance in C++: class A { public: void foo() { print(); } protected: void print() {} }; class B : public A { protected: void print() { std::cout << "test" << std:: endl; } }; Now the following code B b; b.foo(); doesn't print anything, so foo() obviously didn't call the newly defined print(). Is this only solvable by using virtual methods? 回答1: Yes, you need to make print virtual in order for this to work. Otherwise, A::foo has no idea that

问题 I have a very basic question concerning inheritance in C++: class A { public: void foo() { print(); } protected: void print() {} }; class B : public A { protected: void print() { std::cout << "test" << std:: endl; } }; Now the following code B b; b.foo(); doesn't print anything, so foo() obviously didn't call the newly defined print(). Is this only solvable by using virtual methods? 回答1: Yes, you need to make print virtual in order for this to work. Otherwise, A::foo has no idea that

问题 I'd like to make a class that extends the int base class, so that the object itself is an integer (i.e. you set it and read from it directly), but also has input validation - for example, only allow a given range. From what I have researched, the __init__ method is not called when you extend normal base classes, so I'm not sure how to do this. I'm also not clear on how you access the value of the object (i.e. the actual integer assigned to it) or modify that value from within the class. I see

问题 I'd like to make a class that extends the int base class, so that the object itself is an integer (i.e. you set it and read from it directly), but also has input validation - for example, only allow a given range. From what I have researched, the __init__ method is not called when you extend normal base classes, so I'm not sure how to do this. I'm also not clear on how you access the value of the object (i.e. the actual integer assigned to it) or modify that value from within the class. I see