overriding

问题 I have an easy 'homework' to do, but I have found a little problem with the closure of the input stream. To put it simply, I have to make a contact 'list' application in Java, just to use the polymorphism in the correct way. So I have a class Contact and a subclass Private (contact). In both class there is a modify method to change the value of the variables. public void modify() throws IOException { System.out.println("Previously name: " + name); System.out.println("Insert new name"); try

问题 I have been reading about how best to override the equals method when dealing with subclasses and here I have found quite a few posts. They recommend different ways of implementing a solution using instanceof or getClass() to compare objects of different sub classes. However with reference to Effective Java, my understanding is (and I am new to this so I may well be wrong!) Bloch argues that in the end both can be problematic, “There is no way to extend an instantiable class and add a value

问题 What happens when you use a memory override prefix but all the operands are registers? So, let's say you code mov eax, ebx or add eax, ebx and the default is 32-bit but you use a 67h override. How does the processor handle that situation? 回答1: The Intel Software Developer's Manual*, volume 2, section 2.1, details the behavior of each instruction prefix. It says use of the address-size prefix (67h) with an instruction that doesn't have a memory operand is reserved and may cause unpredictable

问题 Ok, I have a rails gem that I am working on and I want it to override a specific method in sprockets. The method I want to override is: Sprockets::Base.digest so that I can base the fingerprint off my gem version when compiling the app's assets. How would I go about doing that? In my gem I create a file lib/sprockets/base.rb and place the following code: class Sprockets::Base def digest @digest = digest_class.new.update(MyGem::VERSION) @digest.dup end end When I run bundle exec rake assets

问题 Ok, I have a rails gem that I am working on and I want it to override a specific method in sprockets. The method I want to override is: Sprockets::Base.digest so that I can base the fingerprint off my gem version when compiling the app's assets. How would I go about doing that? In my gem I create a file lib/sprockets/base.rb and place the following code: class Sprockets::Base def digest @digest = digest_class.new.update(MyGem::VERSION) @digest.dup end end When I run bundle exec rake assets

问题 First of all I apologize for my poor english... Hope someone will understand my question and help me... I'm working on a project using lots of $.post call and I want to improve them by adding the same verification for all of them. I do not want to change all scripts one by one so is there any way to override the $.post function to add the same thing to all of them at the same time ? Or maybe a way to trigger another function on each $.post ? Something like : $.post.each(function(){[...]}); or

问题 I have a class A that is inherited from B. A as some readonly properties that I want to modify from B Hiding those properties with new is not a suitable option, cause the base class has some functions that use its own properties... Can't use the override keyword, cause the properties are not marked as abstract, virtual nor override So I'd like to know whether from the inherited class (B) I can totally recreate the actual instance of my object to access those readonly properties. For example

问题 I'm trying to invoke the RegisterType method in the Unity container. RegisterType has a total of 16 overrides (some of those are parameters some are types). I'm trying to perform the equivalent of: Container.RegisterType<IMyDataProvider, MockData.MockProvider>("MockData", new ContainerControlledLifetimeManager()) Using GetMethod() was a total failure, so I ended up doing this ugly thing: MethodInfo registerTypeGeneric = Container.GetType().GetMethods(BindingFlags.Public | BindingFlags

问题 I have this situation that when AbstractMethod method is invoked from ImplementClass I want to enforce that MustBeCalled method in the AbstractClass is invoked. I’ve never come across this situation before. Thank you! public abstract class AbstractClass { public abstract void AbstractMethod(); public void MustBeCalled() { //this must be called when AbstractMethod is invoked } } public class ImplementClass : AbstractClass { public override void AbstractMethod() { //when called, base

问题 In times before C++11 when a virtual function was overriden in a derived class, it was recommended to add the virtual keyword also to the derived class function to make the intention clear. Nowadays such a function is marked "override" which kind of includes the notion that there must be a virtual base function. Therefore I am now preferring to omit the virtual: class Derived: public Base { public: void Overriden() override; // Instead of: virtual void Overriden() override; }; However this