instantiation

问题 Probably my question is a trivial one, but I never used an application scope bean before. I need the application bean because I have to do time consuming transactions on the database. my search didn't satisfy my curiosity at all. I don't know why but I didn't manage to initialize the bean (it is null) or it the app crashed. So I have an application scope bean @ManagedBean(eager=true) @ApplicationScoped public class ApplicationContainer { ... } eager=true I read that tells JSF to initiate the

问题 I am attempting to instantiate a large number of "particles" using a C# script in Unity. I have created a particle class that contains the creation of a corresponding GameObject. The GameObject within each particle instance is a sphere. When attempting to instantiate a new particle (Particle p = new Particle(...)) I get a Unity warning that the 'new' keyword should not be used. "You are trying to create a MonoBehaviour using the 'new' keyword. This is not allowed. MonoBehaviours can only be

问题 Trying to use Class shown here as a sample for Activator.CreateInstance() http://codeblocks.codeplex.com/wikipage?title=FasterActivator%20Sample public static List<T> SortedCollection<T>(SPListItemCollection items, ListSortType sortType, List<Vote> votes) where T : IVotable { var returnlist = new List<T>(); var functionCreator = FastActivator.GenerateFunc<Func<SPListItem, List<Vote>, T>>(); for (int i = 0; i < items.Count; i++) { returnlist.Add(functionCreator(items[i], votes)); } } switch

问题 So I'm missing something that's probably pretty straightforward to some, but I'm having trouble with it. I've created a List (msgSymbols) that gets populated with a new GameObject every time a button gets pressed (it's basically a custom keyboard) which then gets instantiated to a Grid Layout. But how do I then delete only the last GameObject on that list and update the Grid Layout to reflect that change? (like hitting a backspace button on the keyboard)? The delete key code that I currently

问题 This question already has answers here : Why can templates only be implemented in the header file? (16 answers) Closed 5 years ago . I'm working through an algorithm text, trying to implement everything in C++ for practice. But I can't seem to figure out templating.I have three files: algPlayground.h #include <stdlib.h> #include <vector> using namespace std; template <class T> void insertionSort(vector<T>& toSort); algPlayground.cpp #include <stdlib.h> #include <vector> #include

问题 I am getting an error in instantiating a module in verilog file. I am instantiating like this: module lab3(input clk,set,reset,plus,minus,start,button,output reg [3:0]led,output reg [6:0]y); wire [3:0] indicesgu[3:0]; reg [1:0] going; reg alsogoing,yes; if (going==1 && alsogoing) begin up_counter up_0 ( indicesgu , indices , alsogoing ); end endmodule and my up_counter module starts as: module up_counter(input [3:0] indices_in [3:0],output [3:0]indices[3:0],output alsogoing); reg [3:0]indices

问题 Say I have a file Foo.php: <?php interface ICommand { function doSomething(); } class Foo implements ICommand { public function doSomething() { return "I'm Foo output"; } } ?> If I want to create a class of type Foo I could use: require_once("path/to/Foo.php") ; $bar = new Foo(); But say that I've created a Chain of Command Pattern and I have a configuration file that registers all the possible classes and creates an instance of these classes based on strings that are present in the

问题 I do have a class with lots of static convenience methods. One of them should start a BroadcastReceiver dynamically - but it always returns an InstantiationException. The BroadcastReceiver has a no-parameter constructor so it should work - but it doesn't. Here's what I did so far: Here's the convenience method in it's class: // Static convenience methods in a tools class public class MyTools { // Start BroadcastReceiver dynamically public static BroadcastReceiver startBroadcastReceiver

问题 Consider this pattern extension UIViewController { class func make(sb: String, id: String) -> Self { return helper(sb:sb, id:id) } private class func helper<T>(sb: String,id: String) -> T { let s = UIStoryboard(name: storyboardName, bundle: nil) let c = s.instantiateViewControllerWithIdentifier(id) as! T return c } } that works fine, so let s = SomeViewControllerClass.make( ... ) does in fact return the subclass "SomeViewControllerClass". (Not just a UIViewController.) That's all fine BUT,

问题 So, I'm trying to understand some concepts here. 1) The general "syntax" (if you will) of creating a new object. For example, which of the following is "correct" (I know there's more than one way to instantiate an object): //1) ChildClass obj = new ParentClass(); //2) ParentClass obj = new ChildClass(); I know that the following two are "legal," but I can't understand the difference between instantiating an object when it comes to Child/Parent classes (I already know that these two are okay):