inheritance

问题 Is this the correct way to represent the following code in a UML Class Diagram? CODE: public class CustomerRepository : EntityFrameworkRepository<Customer>, ICustomerRepository { } UML: 回答1: EDIT: Realised first answer wasn't correct after posting. The UML spec says (section 7.3.4): A bound element has the same graphical notation as other Elements of that kind. A TemplateBinding is shown as a dashed arrow with the tail on the bound element and the arrowhead on the template and the keyword

问题 Sometimes it is useful to create an interface that is already implemented by existing third-party code (ie. from a library). For example, we could imagine selecting a subset of the methods of the String class and declaring a GenericString . We might then define other GenericString s that implement these methods, but not other methods of the String class. The only problem would be that the String class doesn't inherit from the GenericString class. Is it possible to add an interface to an

问题 From what i know, the size of a class in c++ depends on the below factors - Size of all non-static data members. Order of data members. If byte padding is enabled or not. Size of its immediate base class. The existence of virtual functions. Mode of inheritance (virtual inheritance). Now I've created 2 classes as below - class A{ int a; short s; int b; char d; };// kept a char at last on purpose to leave a "hole" class B : public A{ char c; }; now on checking the size of A and B I see size of

问题 From what i know, the size of a class in c++ depends on the below factors - Size of all non-static data members. Order of data members. If byte padding is enabled or not. Size of its immediate base class. The existence of virtual functions. Mode of inheritance (virtual inheritance). Now I've created 2 classes as below - class A{ int a; short s; int b; char d; };// kept a char at last on purpose to leave a "hole" class B : public A{ char c; }; now on checking the size of A and B I see size of

问题 From what i know, the size of a class in c++ depends on the below factors - Size of all non-static data members. Order of data members. If byte padding is enabled or not. Size of its immediate base class. The existence of virtual functions. Mode of inheritance (virtual inheritance). Now I've created 2 classes as below - class A{ int a; short s; int b; char d; };// kept a char at last on purpose to leave a "hole" class B : public A{ char c; }; now on checking the size of A and B I see size of

问题 From what i know, the size of a class in c++ depends on the below factors - Size of all non-static data members. Order of data members. If byte padding is enabled or not. Size of its immediate base class. The existence of virtual functions. Mode of inheritance (virtual inheritance). Now I've created 2 classes as below - class A{ int a; short s; int b; char d; };// kept a char at last on purpose to leave a "hole" class B : public A{ char c; }; now on checking the size of A and B I see size of

问题 I have a function in a superclass that returns a new version of itself. I have a subclass of this super that inherits the particular function, but would rather it return a new version of the subclass. How do I code it so that when the function call is from the parent, it returns a version of the parent, but when it is called from the child, it returns a new version of the child? 回答1: If new does not depend on self , use a classmethod: class Parent(object): @classmethod def new(cls,*args,*

问题 I have a function in a superclass that returns a new version of itself. I have a subclass of this super that inherits the particular function, but would rather it return a new version of the subclass. How do I code it so that when the function call is from the parent, it returns a version of the parent, but when it is called from the child, it returns a new version of the child? 回答1: If new does not depend on self , use a classmethod: class Parent(object): @classmethod def new(cls,*args,*

问题 I read the Apple's reference about access modifiers in Swift 3. I read also about the same on stackoverflow but I didn't get an answer as the person who asked. As I understood correctly, there are four levels: Open, Public Internal Fileprivate Private I created the schemes for myself to understand a difference between all these modifiers and uploaded here. As you can see, there are no differences between Public and Internal modifiers.. However they're on different levels. Any idea would be

问题 class X { protected int v = 0; public X() { v += 10; } public void proc(X p) { System.out.println(43); } } class Y extends X { public Y() { v += 5; } public void proc(X p) { System.out.println(57); } public int getV() { return v; } } class Z extends Y { public Z() { v += 9; } public void proc(Z p) { System.out.println(39); } } class Main { public static void main(String[] args) { X x = new Z(); Y y = new Z(); Z z = new Z(); x.proc(z);// 1 System.out.println(y.getV()); } } From what I can