overriding

问题 How can I go about making a child class override a privileged method of a base class? If its not possible, is there another way to achieve what I am trying to accomplish in the simple code example below? I cannot convert the baseclass function parseXML() to public because it requires access to private variables function BaseClass() { var map = {}; // I cannot make this function public BECAUSE it accesses & changes private variables this.parseXML = function( key, value ) { alert("BaseClass:

问题 I want to do adapter template. There is error in AutoToTravelAdapter Move(); method How can I override and inherit Transport method? I try to use virtual but it does not works. I change to public override void Move() in both adapters and that works! Thanks, Zohar Peled ! using System; namespace Adapter { class Program { static void Main(string[] args) { Traveller traveller = new Traveller(); Transport camelTransport = new CamelToTravelAdapter(); Transport autoTransport = new

问题 I want to do adapter template. There is error in AutoToTravelAdapter Move(); method How can I override and inherit Transport method? I try to use virtual but it does not works. I change to public override void Move() in both adapters and that works! Thanks, Zohar Peled ! using System; namespace Adapter { class Program { static void Main(string[] args) { Traveller traveller = new Traveller(); Transport camelTransport = new CamelToTravelAdapter(); Transport autoTransport = new

问题 Why do you need (in order to make it compile) the intermediate CloneImplementation and std::static_pointer_cast (see Section 3 below) to use the Clone pattern for std::shared_ptr instead of something closer (see Section 2 below) to the use of raw pointers (see Section 1 below)? Because as far as I understand, std::shared_ptr has a generalized copy constructor and a generalized assignment operator? 1. Clone pattern with raw pointers : #include <iostream> struct Base { virtual Base *Clone()

问题 The following compiles without any problem boolean flag = true; Boolean flagObj = flag; Now imaging the following scenario interface ITest{ Boolean getStatus(); } class TestImpl implements ITest{ public boolean getStatus(){ // Compile error: return type is incompatible return true; } } My question is about the compile error at the mentioned line. My Interface mentions return type as Boolean but the implemented method returns boolean ( the literal ) My question is, if Boolean and boolean are

问题 Consider the following classes representing an Ordering system: Public Class OrderBase Public MustOverride Property OrderItem as OrderItemBase End Class Public Class OrderItemBase End Class Now, suppose we want to extend these classes to a more specific set of order classes, keeping the aggregate nature of OrderBase: Public Class WebOrder Inherits OrderBase Public Overrides Property OrderItem as WebOrderItem End Property End Class Public Class WebOrderItem Inherits OrderItemBase End Class The

问题 guys I know this question is very basic but I've met in few publications (websites, books) different style of override virtual function. What I mean is: if I have base class: class Base { public: virtual void f() = 0; }; in some publications I saw that to override this some authors would just say: void f(); and some would still repeat the virtual keyword before void. Which form of overwriting is in good style? Thank you for your answers. 回答1: This is purely a matter of taste. Some weak

问题 guys I know this question is very basic but I've met in few publications (websites, books) different style of override virtual function. What I mean is: if I have base class: class Base { public: virtual void f() = 0; }; in some publications I saw that to override this some authors would just say: void f(); and some would still repeat the virtual keyword before void. Which form of overwriting is in good style? Thank you for your answers. 回答1: This is purely a matter of taste. Some weak

问题 So here is the quote from the book: The overriding method must NOT throw checked exceptions that are new or broader than those declared by the overridden method. For example, a method that declares a FileNotFoundException cannot be overridden by a method that declares a SQLException, Exception, or any other non-runtime exception unless it's a subclass of FileNotFoundException. Now here is my question, if the method in the superclass throws an exception, then can the overriding method NOT

问题 I'm trying to understand how Java handles cases of ambiguity that come out when a concrete class inherits (abstract or concrete) methods having the same name from different classes/interfaces. I've not been able to find a general rule, this is why I decided, once for all, to spend some time on this by using a practical approach. I considered 8 different cases, combining abstract methods non-abstract methods abstract classes interfaces resulting in this scheme: +-------------------------+ |