overriding

问题 Seems like in .NET Framework there is an issue with optional parameters when you override the method. The output of the code below is: "bbb" "aaa" . But the output I'm expecting is: "bbb" "bbb" .Is there a solution for this. I know it can be solved with method overloading but wondering the reason for this. Also the code works fine in Mono. class Program { class AAA { public virtual void MyMethod(string s = "aaa") { Console.WriteLine(s); } public virtual void MyMethod2() { MyMethod(); } }

问题 In PHP, what do you mean by function overloading and function overriding. and what is the difference between both of them? couldn't figure out what is the difference between them. 回答1: Overloading is defining functions that have similar signatures, yet have different parameters. Overriding is only pertinent to derived classes, where the parent class has defined a method and the derived class wishes to override that method. In PHP, you can only overload methods using the magic method __call.

问题 Xcode 6.3. Within a class implementing UITextFieldDelegate protocol, I would like to override touchesBegan() method to possibly hide the keyboard. If I avoid a compiler error in the function spec, then there is a complier error trying to read the "touch" from the Set or NSSet, or else the super.touchesBegan(touches , withEvent:event) throws an error. One of these combinations compiled in Xcode 6.2! (So where is documentation to Swift "Set" and how to get an element from one?) override func

问题 With the struct definition given below... struct A { virtual void hello() = 0; }; Approach #1: struct B : public A { virtual void hello() { ... } }; Approach #2: struct B : public A { void hello() { ... } }; Is there any difference between these two ways to override the hello function? 回答1: They are exactly the same. There is no difference between them other than that the first approach requires more typing and is potentially clearer. 回答2: The 'virtualness' of a function is propagated

问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 2 years ago . The reason behind asking the question is that String in Java are interned So String s1 = "Hello"; String s2 = "Hello"; Both s1 and s2 will point to same object in the memory. Two different objects will not be created. s1.equals(s2) should return true and it does. Now In java documentation it says

问题 I have base class with abstract properties. I want all inheriting classes to override abstract properties. Example: public class Person { public string Name{get;set;} public string LastName{get;set;} } public class Employee : Person { public string WorkPhone{get;set;} } public abstract class MyBase { public abstract Person Someone {get;set;} } public class TestClass : MyBase { public override Employee Someone{get;set;} //this is not working } Base class has Someone property with Person type.

问题 I would look this up on Google/MSDN, but I have no idea what it's called so I'm asking here. In Java, I seem to remember you can do this really cool thing like: Class MyClass { int number; MyClass() { } void setNumber(int number) { this.number = number; } } and then do something like: MyClass myClass = new MyClass() { override void setNumber(int Number) { this.number = 2 * number; } }; ...or something. Forgive any mistakes I made above - I haven't actually touched Java in about 6 years. The

问题 I am currently programming a Jump n' Run game in C# using OpenTK Framework and OpenGL. Open TK provides preset functions like GameWindow.Run(); or GameWindow.onUpdateFrame(); onRenderFrame(); As far as i thought through it, all actions that draw OpenGL elements or primitives should belong into onRenderFrame, whereas game events like player movement should be performed in onUpdateFrame, so these actions can be calculated in advance before rendering a new frame. Am I right? Would it make a

问题 I'm writing a sencha touch app using sencha architect. Because my app do lot of ajax request, most of it need to send 'token' in request header for authentication. So I think of create child class base on Ext.Ajax which always has 'token' in request header. Then I can use this child class without care of the header. MyApp.override.Ajax.request({ ... }) I try define this in app/override/Ajax.js Ext.define('Myapp.override.Ajax', { override: 'Ext.Ajax', headers: { 'token': 'test' } }); I also

问题 I'm new to Prestashop. I want to override the CSS file of a module, say blockpermanentlinks . The official documentation says that I have to put the new CSS file in /themes/my_theme/css/modules/my_module/my_module.css . It doesn't work. The line <link href="/prestashop/themes/my_theme/css/modules/blockpermanentlinks/blockpermanentlinks.css" rel="stylesheet" type="text/css" media="all" /> is produced but if I visit that CSS file with my browser a 'Page not found' is displayed. Any hints? 回答1: