interface

问题 The following interface: import javax.xml.ws.Action; public interface AnnotationsTestInterface { @Action public void annotatedMethod(); } And an implementing class: public class Impl implements AnnotationsTestInterface {} At this point Eclipse asks me to add unimplemented methods (I choose this) or make the class abstract. After the addition the class looks like this: import javax.xml.ws.Action; public class Impl implements AnnotationsTestInterface { @Override @Action public void

问题 This question already has answers here : Disabling the Close-Button temporarily (7 answers) Closed 3 years ago . How can I disable the close button of a form like in the image below? (the image below show a MessageBox window) The MessageBox above was generated by me! I want to disable the close button of a normal form. 回答1: You handle the Closing event (and not the Closed event) of the Form. And then you use e.CloseReason to decide if you really want to block it (UserClose) or not

问题 despite the title I'm not going to ask about a mere translation between OO world and Haskell, but I can't figure out a better title. This discussion is similar, but not equal, to this one. I've started a toy project just to expand my limited knowledge of Haskell while reading "Learn You a Haskell for a Great Good", and I've decided to implement a very basic "Elemental Type System", which is a subset of a typical battle system in games like Final Fantasy et simila. I'm skipping most of the

问题 Okay, I have two namespaces. One contains my interface and one contains the implementing class. Like this: namespace Project.DataAccess.Interfaces { public interface IAccount { string SomeMethod(); } } namespace Project.DataAccess.Concrete { class Account : Project.DataAccess.Interfaces.IAccount { string SomeMethod() { return "Test"; } } } With this code I get an error: 'Project.DataAccess.Concrete.Account' does not implement interface member 'Project.DataAccess.Interfaces.IAccount.SomeMethod

问题 Okay, I have two namespaces. One contains my interface and one contains the implementing class. Like this: namespace Project.DataAccess.Interfaces { public interface IAccount { string SomeMethod(); } } namespace Project.DataAccess.Concrete { class Account : Project.DataAccess.Interfaces.IAccount { string SomeMethod() { return "Test"; } } } With this code I get an error: 'Project.DataAccess.Concrete.Account' does not implement interface member 'Project.DataAccess.Interfaces.IAccount.SomeMethod

问题 Why are static methods supported from Java 8? What is the difference between the two lines in main method in below code? package sample; public class A { public static void doSomething() { System.out.println("Make A do something!"); } } public interface I { public static void doSomething() { System.out.println("Make I do something!"); } } public class B { public static void main(String[] args) { A.doSomething(); //difference between this I.doSomething(); //and this } } As we can see above, I

问题 I am having trouble creating a mapping when the List type is an interface. It looks like I need to create an abstract class and use the discriminator column is this the case? I would rather not have to as the abstract class will just contain an abstract method and I would rather just keep the interface. I have an interface lets call it Account public interface Account { public void doStuff(); } Now I have two concrete implementors of Account OverSeasAccount and OverDrawnAccount public class

问题 We know that it is necessary to implement all methods of an interface, if we want to make an object of that class. But why is it not necessary to implement both the methods compare() and equals() of interface Comparator in java? I agree that the purpose is solved but even then why is it not mandatory to override equals () if we override compare ()? 回答1: Since all classes implicitly extend Object every implementation of a Comparator has an equals method, because every Object has one. It would

问题 i had another bug in my app caused by careless usage of Delphi interfaces. When i pass an interface to a procedure which ignores that argument, the instance is never freed. See the following simple example: ITest = interface procedure Test; end; Tester = class(TInterfacedObject, ITest) public procedure Test; end; Base = class public procedure UseTestOrNot(test : ITest); virtual; abstract; end; A = class(Base) public procedure UseTestOrNot(test : ITest); override; end; B = class(Base) public

问题 I thought I had found the answer in the following example, but not quite. boost::asio::ip::udp::socket socket(io_service); ... boost::asio::ip::address_v4 local_interface = boost::asio::ip::address_v4::from_string("1.2.3.4"); boost::asio::ip::multicast::outbound_interface option(local_interface); socket.set_option(option); How do I map eth0 to the appropriate outbound_interface option? 回答1: The following code works fine on Windows and Mac OS X: const ip::udp::resolver::query queryIF( ip::udp: