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问题 Reposting a question with more detail. The problem is a nullPointerException which occurs at clusterer.next(). Below is a simplified version of the program and am hoping you can notice where the issue is. public class Clustering { private DistanceMeasure measure; //Manhattan or Euclidean private ClusterMethod method; //SingleLinkage or CompleteLinkage private Clusterer clusterer; public static void main(String[] args) { new Clustering().start(); } Clustering() { measure = new Manhattan();

问题 In the following PHP code I would like to replace the __CLASS__ magic constant in the Foo class with a function __X__() (or something similar) so that when the method hello() is called from an instance $bar of the Bar class, it prints hello from Bar (instead of hello from Foo ). And I want to do this without overriding hello() inside Bar . So basically, I want a version of __CLASS__ that binds dynamically at run-time rather than at compile-time. class Foo { public function hello() { echo

问题 I need help to set a Windows Form window classname to one chosen by myself. Didn't find anything useful, so I ask here. I need this because an old C++ application DLL written by my brother(he has not the code any more) is using FindWindow method with classname to copy data. So i need rename the window class name the same as the old app to get my new app to work. Any Idea ? 回答1: Considering this could look as unanswered I found the solution yesterday. It's not possible to change Window

问题 I'm relatively new to React and working on a John Conway - Game of Life app. I have built a Gameboard.js functional component for the board itself (which is a child of App.js ) and a Square.js functional component which represents an individual square in the board (and is a child of Gameboard and a grandchild of App ). In App I have a function called alive which I want to change the color of an individual square when it is clicked by the user. App also has an 'alive' property in it's state

问题 Say I have a Java interface Blender.java with various implementations Cuisinart.java , Oster.java , Blendtec.java , etc. Now I want to write a program like so: public class Blendifier { // ... public static void main(String... args) { Blender blender = new Cuisinart(); blender.blend(); } } But now if I want to use the Blendtec instead of the Cuisinart , I have to open up the source, change the code, and recompile. Instead, I'd like to be able to specify which Blender to use on the fly when I

问题 My JavaScript module fails to find a particular DOM element with a classname using $('.classname') even when the element exists. $('.classname').length returns 0, where as $.find('.classname').length returns 1. Website contains other JavaScript modules also. Can anyone help me to find why this is happening? My jQuery version is 1.7.1. To reproduce this 1- Go to avc.com 2- Open console. 3- Paste the following code in console. var head = document.getElementsByTagName("head")[0]; var script =

问题 The following javascript code does not work correctly. (I am using IE9 and cannot use a different browser or JQuery): var elems = document.getElementsByClassName("EditableTextBox"); for (var i = 0; i < elems.length; i++) { elems[i].className = "Zero"; } What happens is, only SOME elements with className "EditableTextBox" are changed to className "Zero", many remain with className "EditableTextBox". There is no further code that could be causing this issue; this code is the last bit of code I

问题 Suppose I have an model: class Post end posts = Post.where(***) puts posts.class # => ActiveRecord::Relation Then how can I get the model class name through the variable 'posts', maybe some method called model_class_name: puts posts.model_class_name # => Post Thanks :) 回答1: The #klass attribute of ActiveRecord::Relation returns the model class upon which the relation was built: arel = User.where(name: "fred") arel.klass # User To get the class's name: arel.klass.name Tested in ActiveRecord 4

问题 This situation probably is not entirely uncommon to some of you: you have some functionality to put in a class but the perfect name (*) for that class is taken by one of the classes in the System namespace or other namespace/class that's not yours but you're using / import ing. (*) By perfect I mean small, concise and clear names. For instance I have an Utils class that has a Diagnostics (mostly debug utils) class and a Drawing class. I could: have a DrawingUtils class and a DiagnosticsUtils

问题 In Java the file name must be the public class name defined in that java file. Does C# has similar requirement? can I have a A.cs file which only defines a public Class B inside? thanks, 回答1: No, there is no similar requirement. Yes, you can do this. It is considered bad practice, however. Microsoft StyleCop will warn you if you do this, but everything will compile fine. 回答2: No, there is not a requirement that the filename matches a single public class being defined in the file. In fact, it