instance

问题 I am new to Ruby language. I understand that @@count: Class variables @name: Instance variables my_string: Local variables I keep the above in mind. However, I found one Ruby code like this: class HBaseController < ApplicationController ... def result conn = OkHbase::Connection.new(host: 'localhost', port: 9090, auto_connect: true) ... end end 'conn' confuses me a lot. Is 'conn' a instance variable, or local variable? And what is the scope of 'conn'? 回答1: I try to explain it with a little

问题 I am testing Google App Engine using JAVA and I want to test to run multiples instances in parallel. However, I don't know how to activate multiples instances. I tried running this Servlet in different browser (also I tried running concurrent calls in a different machine - with different IP) import java.io.IOException; import javax.servlet.*; import javax.servlet.http.*; import java.math.*; public class SimpleServlet extends HttpServlet { //A variable that is NOT thread-safe! public void

问题 I've created an button object in flash. The button contains 2 layers. One is the background image and on top of it is a textField. The textfield is dynamic. I use the button inside a movieclip and I export it in a SWC. The I'm trying to use it in flex. I'm trying to do this: var myComponent:MyComponent = new MyComponent(); myComponent.button01.theTextField.text = "Caption"; I get and instance of the button( myComponent.button01 is not null in Flex debugger), but the instance of the textField(

问题 There's something I really don't get about the new pricing. As far as I can see, I am now billed (amongst others) for the number of "instance/hours". On the other hand, a while back I've opted for the "Always on" feature, which since then effectively has 3 "Resident" instances of my application always running. Now, A.F.A.I.C.S. , on the old pricing model, the one where I was charged by CPU Time used, the "always on" feature was great, not only did it made the app more responsive, but since

问题 In my C++ project, I have an Engine class and an Object class. My issue lies with how my instances of Object are created. Currently this is done through the use of a CreateObject(parameters) function in the Engine class. This adds a new instance of Object to an std::vector of Object instances. I want to maintain this list of instances of Object in my Engine class, but without the need for the CreateObject(parameters) function. My reason for this is so that I can create new classes that can

问题 In VBA I need a module sub to tell an instance to set up some variables. In Module 1 I have: Sub Load() ThisWorkbook.SetupVariables ThisWorkbook.TestVariables End Sub In ThisWorkbook I have: Private Variable1 As Integer Private Variable2 As String Private Variable3 As MyUserDefinedObjectType Public Sub SetupVariables() Variable1 = 5 Variable2 = "Five" Set Variable3 = New MyUserDefinedObjectType() End Sub Sub TestVariables() MsgBox Variable1 & " is spelled " & Variable2 Variable3.SomeFunction

问题 I have a project which others have written and I have taken over it, hoping to make the app better. I encountered one problem: From one class: I write _customclass.variable. CustomClass is another class and variable is a property and is of int type. And I get value of the variable in this class, but when I change it to self.customclass.variable, I always get 0. Is there other alternative ways to get value from other class? (a) @property (readwrite)int boxSpacing; (b) @synthesize boxSpacing;

问题 i have a privacy form, in wich i am selecting what application should be hidden when one accesses a user's profile. The form contains several checkboxes,and the user checks what he wants to be hidden. What i want is, when a user accesses this form, the form to be an instance of the privacy form already saved, if it exists one. I mean, if i already checked hide application 1, when i am accessing the form again, the corresponding check box to be checked. my code: def save_privacy(request): if

问题 Can I locally reference a class in C#, instead of an instance of a class? The following code won't compile but, as an example, something like: void someFunc() { var a = System.Math; var b = a.Abs(4); } edit: In the real program it's not the System.Math class and I'm wanting to construct the class and return the constructed value. I didn't think originally that the context in which I wanted to use the class would be relevent, and probably it shouldn't be. Anastasiosyal has an interesting idea

问题 class me { private $name; public function __construct($name) { $this->name = $name; } public function work() { return "You are working as ". $this->name; } public static function work() { return "You are working anonymously"; } } $new = new me(); me::work(); Fatal error: Cannot redeclare me::work() the question is, why php does not allow redeclaration like this. Is there any workaround ? 回答1: There is actually a workaround for this using magic method creation, although I most likely would