instance

问题 I have this code on Visual C++ 2010 #include <iostream> #include <string> using namespace std; class Human { private: int magic; int health; string name; public: int GetMagic() const; int GetHealth() const; Human(int, string); ~Human(); }; //helper int Human::GetHealth() const { cout <<"This returns Human::health" << endl; return Human::health; } int Human::GetMagic() const { cout <<"This returns this->magic"<< endl; return this->magic; } //con/destructor Human::Human(int a, int b, string c):

问题 This is a snippet of Java code: static { ture = 9; } static int ture; { // instance block System.out.println(":"+ture+":"); } How is that it compiles at all? Declaration of variable 'ture' has been performed after initialization. As far as I know static blocks and fields have been executed in the order they appear. And now why is that value 9 within instance block has been printed 3 times? By the way, the instance of the class has been created 3 times. That is not a homework, I am learning

问题 This may sound stupid, But I am having hard time to figure this out; any help would be appreciated: I have two user controls called “ Safety_Check ” and “ OEE_Track ”. In my MainForm I have a panel called “ pnl_main_controller ” this is where I am displaying both my user controls. I have two buttons on my main form and I am dynamically switching between both without any issue. Safety_Check User control; public partial class Safety_Check : UserControl { private static Safety_Check _instance;

问题 I have a non-static class called ImplementHeaderButtons which contains a non-static public method called Implement . The name of the class and method are not important, what's important is that they are not static, so they need to be instantiated in order to be used, right? So I used to do this: var implementHeaderButtons = new ImplementHeaderButtons(); implementHeaderButtons.Implement(this, headerButtons); But then I decided to play around a bit with it (actually I was looking for a way to

问题 I was asked a question in an interview and i wasn't able to answer it... Here is the question How will you define an instance[c#]? My answer was it is an other name of an object ... what is the right answer for this question... 回答1: Instance is to class as cake is to recipe. Any time you use a constructor to create an object, you are creating an instance. 回答2: MyObject obj = new MyObject( ); 回答3: I would describe instance as a single copy of an object. There might be one, there might be

问题 I am using a ServerSocket port to run one instance only of my Java Swing application, so if a user tries to open another instance of the program, i show him a warning that "Another instance is already open". This works fine, but instead of showing this message i want to set focus on the running application itself, like some programs does (MSN Messenger), even if it was minimized. Is there a solution for this for various operating systems ? 回答1: Since you use a server socket I assume that you

问题 I am using Delphi6 and have a data module with an ADO DataSet which is used by two forms, formA and FormB. Each form has a Dataset.Open() in OnCreate and Dataset.Close() in OnClose . If both forms are open simultaneously and formB is closed the dataset is closed in formA. How can I prevent this, essentially I need separate instances of the dataset for each form but at the same time use the datamodule. 回答1: The simplest way to achieve what you want is to create an instance of the data module

问题 In Java suppose we have two classes A and B such that B inherits A and A has three private fields and a constructor with three parameters: public class A { private int a ; private int b ; private int c ; public A(int a, int b, int c) { this.a = a; this.b = b; this.c = c; } } and here is class B public class B extends A { public B() { super(1,2,3); } } We consider the following test class public class TestA { public static void main(String[] args) { A a = new A(1,2,3); B b = new B(); } } The

问题 I am using C#. I have created a class which can be included in any c#.net project (desktop or web based), but I want that only 10 objects will be created in that application of my class. If object instances created more than 10 then it should give an error or simple will not work. There can be two situations, I'll included myclass.cs file in any project or I'll bundle my class in a DLL and then include it in any application In both situations it must through error if more than 10 instances of

问题 How can I check which platform my app runs, AWS EC2 instance, Azure Role instance and non-cloud system? now I do that like this: if(isAzure()) { //run in Azure role instance } else if(isAWS()) { //run in AWS EC2 instance } else { //run in the non-cloud system } //checked whether it runs in AWS EC2 instance or not. bool isAWS() { string url = "http://instance-data"; try { WebRequest req = WebRequest.Create(url); req.GetResponse(); return true; } catch { return false; } } but I have one problem