inheritance

问题 I am using Apache CXF's cxf-codegen-plugin to turn a wsdl into java objects. I specified a binding file to add additional jaxb processing. I want all of these files to inherit from an interface (or extend an abstract class). My problem is that while I can get this to work with one generated file using <jaxb:bindings node="xsd:complexType[@name='sampleObj'] "> <inheritance:implements>example.Dao</inheritance:implements> </jaxb:bindings> which will make sampleObj implement example.Dao. I do not

问题 From http://www.parashift.com/c++-faq-lite/basics-of-inheritance.html#faq-19.5 A member (either data member or member function) declared in a protected section of a class can only be accessed by member functions and friends of that class, and by member functions and friends of derived classes So, what is the way to access the protected function fun in the derived class? #include <iostream> using namespace std; class X { private: int var; protected: void fun () { var = 10; cout << "\nFrom X" <

问题 I want to extend a child's functionality of a specific method in a parent class. I'm still getting used to OOP in ES6 so I'm not sure if this is possible or breaks rules. I'm looking for something like this: class Parent { constructor(elem) { this.elem = elem; elem.addEventListener((e) => { this.doSomething(e); }); } doSomething(e) { console.log('doing something', e); } } class Child extends Parent { constructor(elem) { // sets up this.elem, event listener, and initial definition of

问题 I'm learning about classes and inheritance in javascript. I thought that the following is a fairly standard way of extending an existing object as I got the style from the MDN docs on Object.create I was expecting to see 'ok' and then 'Yay! Hello' in the console, but instead I go this error: Uncaught TypeError: #<MyPromise> is not a promise at new MyPromise (<anonymous>:5:17) at <anonymous>:19:6 It looks like the Promise constructor is throwing an exception because it can tell that the object

问题 As I am working as a C# developer, I know that we can implement multiple inheritance by use of Interface . Can anybody please provide me link OR code for how to achieve multiple inheritance with C# . I want code for how to achieve multiple inheritance in C# with the use of Interface . Thanks in advance. 回答1: Here is a good example. http://blog.vuscode.com/malovicn/archive/2006/10/20/How-to-do-multiple-inheritance-in-C_2300_-2D00-Implementation-over-delegation-_2800_IOD_2900_.aspx A quick code

问题 In Java, imports are related to an (outer) class, as every (outer) class is supposed to be coded in a separate file. Thus, one could claim that the import ...; directives before a class definition are associated with the class (somewhat like annotations are). Now, if one could inherit a parent class' imports, that would greatly reduce the clutter of source files. Why should this not be possible? i.e. why should the Java compiler not consider also the imports of base classes? Notes: There's

问题 /*Child is inherited from Parent*/ class Parent { public: Parent () //Constructor { cout << "\n Parent constructor called\n" << endl; } protected: ~Parent() //Dtor { cout << "\n Parent destructor called\n" << endl; } }; class Child : public Parent { public: Child () //Ctor { cout << "\nChild constructor called\n" << endl; } ~Child() //dtor { cout << "\nChild destructor called\n" << endl; } }; int main () { Parent * p2 = new Child; delete p2; return 0; } If I make Parent 's destructor virtual,

问题 /*Child is inherited from Parent*/ class Parent { public: Parent () //Constructor { cout << "\n Parent constructor called\n" << endl; } protected: ~Parent() //Dtor { cout << "\n Parent destructor called\n" << endl; } }; class Child : public Parent { public: Child () //Ctor { cout << "\nChild constructor called\n" << endl; } ~Child() //dtor { cout << "\nChild destructor called\n" << endl; } }; int main () { Parent * p2 = new Child; delete p2; return 0; } If I make Parent 's destructor virtual,

问题 I have a few Java enums as such public enum Aggregation { MORTGAGE( "Mortgage" ), POOLS( "Pools" ), PORTFOLIO( "Portfolio" ); private Aggregation( final String name ) { m_Name = name; } private String m_Name; static Map< String, Aggregation > c_LOOKUP = new HashMap< String, Aggregation >(); static { for (Aggregation agg:values()){ c_LOOKUP.put(agg.m_Name,agg); } } public Aggregation lookup(String name){ return c_LOOKUP.get( name ); } @Override public String toString() { return m_Name; } }

问题 Hello I need to inherit my schemas in mongoose library. Are there complete plugins for that? Or how should I do that myself? I need to inherit all pre, post, init middleware from a Base schema also. 回答1: You may want to look at using a Mongoose Plugin: http://mongoosejs.com/docs/plugins.html A plugin that does what you want 'out of the box' is here: https://github.com/briankircho/mongoose-schema-extend 回答2: For others looking for this functionality, Mongoose 3.8 now has Schema Inheritance via