overriding

问题 This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center. Closed 7 years ago . I'm try to pass a parameter while navigate between pages.. in the firs page I have: private void companyGrid_Tap(object sender, GestureEventArgs e) {

问题 I have one class and one interface: public interface A { public void getNum(); } public class B { public void getNum() { System.out.println("4"); } } public class C extends B implements A { protected void getNum() { System.out.println("3"); } } Now my question is, why this code is giving compilation error and how can we avoid it. Is there any way in which we can override this method in class C? 回答1: From Java Language Specification: jls-8.4.8.3 The access modifier (§6.6) of an overriding or

问题 I have a relationship between two base classes: public abstract class RecruiterBase<T> { // Properties declare here // Constructors declared here public abstract IQueryable<T> GetCandidates(); } public abstract class CandidateBase<T> { // Properties declare here // Constructors declared here } And their concrete implementations as such: public class CandidateA : CandidateBase<CandidateA> { // Constructors declared here } public class RecruiterA : RecruiterBase<RecruiterA> { // Constructors

问题 Would it be at all possible to have an AsyncTask in Android which "Throws" things? If I don't @Override the method, it doesn't get called. If I add the "throws" at the end, there are compiler errors. For example, I want to do something like: class testThrows extends AsyncTask<String,Void,JSONObject> { @Override protected JSONTokener doInBackground(<String>... arguments) throws JSONException { String jsonString = arguments[0]; JSONTokener json = new JSONTokener(jsonString); JSONObject object =

问题 Why can't I call the base implementation of f here: type Base = abstract f : int -> int -> int default this.f (x : int) (y : int) : int = x + y type Derived = inherit Base override this.f (x : int) (y : int) : int = base.f -x -y The call to base.f elicits this compiler error: error FS0419: 'base' values may only be used to make direct calls to the base implementations of overridden members If I change f to take a single argument then it compiles. Presumably this is something to do with

问题 There is an exercise "OverloadResolutionOverride" What will be the output of the following code: class Foo { public virtual void Quux(int a) { Console.WriteLine("Foo.Quux(int)"); } } class Bar : Foo { public override void Quux(int a) { Console.WriteLine("Bar.Quux(int)"); } public void Quux(object a) { Console.WriteLine("Bar.Quux(object)"); } } class Baz : Bar { public override void Quux(int a) { Console.WriteLine("Baz.Quux(int)"); } public void Quux<T>(params T[] a) { Console.WriteLine("Baz

问题 when on Mouse Over state on a link the status bar shows the link's location in the status bar like in the following image... is there a way to change\override this to show some desired text... 回答1: In ie9 method 1 does not have any effect. Method 2 also defeats the purpose of concealing info, by placing active file path in status bar, rather than customary interpolated uri: C:\\\filepath\server\local\whatever Perhaps there is a way to use method 2. Possibly a proxy link-file location

问题 Is it possible to override (C-style) casts in C++? Suppose I have the code double x = 42; int k = (int)x; Can I make the cast in the second line execute some code I wrote? Something like // I don't know C++ // I have no idea if this has more syntax errors than words operator (int)(double) { std::cout << "casting from double to int" << std::endl; } The reason I ask is because of the question "Is there any way to get gcc or clang to warn on explicit casts?" and my suggestion there. 回答1: § 12.3

问题 Is there some convenient way to override register view in Flask-Security? I'm pretty happy with the built-in view for registration, but I need it to be accessible only after authentication and by certain roles. I tried to override it like this (with SECURITY_REGISTER_URL='/register/' ) but that just takes the built-in function and mine is completely ignored: @app.route('/register/') @login_required @roles_required('superuser') def register(): """View function which handles a registration

问题 I have a spring-boot application. I want to override some properties which was configuration in application.yml when executing the jar. My code like this: @Service public class CommandService { @Value("${name:defaultName}") private String name; public void print() { System.out.println(name); } } And the Application.java is @SpringBootApplication public class Application implements CommandLineRunner { @Autowired private CommandService commandService; public static void main(String[] args) {