extending

问题 So my program has a need of a type of circular ArrayList. Only circular thing about it has to be the get(int index) method, this is the original: /** * Returns the element at the specified position in this list. * * @param index index of the element to return * @return the element at the specified position in this list * @throws IndexOutOfBoundsException {@inheritDoc} */ public E get(int index) { rangeCheck(index); return elementData(index); } If index is -1 it should get the element with

问题 Suppose there is a class with all of its constructors declared as private. Eg.: public class This { private This () { } public someMethod( ){ // something here } // some more-- no other constructors } From what I know, making all constructors private is similar to declaring the class "This" as final -- so that it can't be extended. However, the Eclipse messages i'm getting are giving me the impression that this is possible-- an all-constructors-private class can be extended. Take a look at

问题 I am using jQuery v1.8.3 and jQuery UI v1.9.2. I would like to extend an existing jQuery UI widget (in my case the Autocomplete widget) by adding and overriding just some options and methods but keeping the others functionalities as those present in the official release. How can I make that the "proper" (maybe, the "standard") way? P.S. : I searched on the Web (1, 2, ...) and I found documentation mostly related to creating a new jQuery UI widget but not to extending an existing one. 回答1: In

问题 I'm new at C, so sorry for my lack of knowledge (my C-book here is really massive :) I would like to extend a shared library (libcustomer.so) with closed source, but public known api. Is something like this possible? rename libcustomer.so to liboldcustomer.so create an extended shared library libcustomer.so (so others implicitly use the extended one) link liboldcustomer.so into my extended libcustomer.so via -loldcustomer forward any not extra-implemented methods directly to the old

问题 I am using Ruby on Rails 3.2.9 and I would like to extend the framework with a custom validator located in a sub-directory of the lib/ directory. I implemented the following: # lib/extension/rails/custom_validator.rb module Extension module Rails class CustomValidator < ActiveModel::EachValidator # ... end end end After I restart the server I get the Unknown validator: 'CustomValidator' error. How can I solve the problem? Note I : In the config/application.rb file I stated config.autoload

问题 When importing an extended DOMElement object with specific properties into another DOMDocument than the one it was created with all properties are lost (I guess it doesn't actually copy the no but a new node is created for the other document and just the values for the DOMElement class are copied to the new node). What would be the best way to have the properties still available in the imported element? Here's an example of the problem: <?php class DOMExtendedElement extends DOMElement {

问题 I try to create an instance of a class that extends a Java class, and in that instance add some class member variables. Here's my attempt: var ui = Java.extend(javax.swing.JPanel, { cb : new JCheckBox("A checkbox", true), }); However, the Nashorn interpreter throws this error: "TypeError: function noSuchMethod () { [native code] } is not a constructor function" What am I doing wrong? Nashorn didn't complain when I added an instance of a custom class, like se.datadosen.util.Stopwatch, but it

问题 I was wondering, if it is possible to extend the standard java logger (java.util.logging.Logger;) for another logger level. The goal is, that there should show up "ERROR" instead of "SEVERE" in the log files. Is that possible? Or do I have to use a different logger instead (e.g. Log4j)? Thanks a lot! 回答1: If you just want to print something different than the standard you could set your own formatter, see http://tutorials.jenkov.com/java-logging/formatters.html If you want to add an

问题 I wonder if anyone can help me with this issue, I can't seem to find anyone else who's wanting to do this with flexbox! I've set up a basic Flexbox scenario where several elements (li) appear in a flexbox container (ul). And I've also set it so that the maximum amount li's that will fit in a row before wrapping is 3 (done by setting a ul width of 900px and a flex-basis of 260px for the li's). This all works great, but the problem for me arises in the fact that the text will ultimatley be

问题 I have seen a lot of discussion regarding extending Element. As far as I can tell, these are the main issues: It may conflict with other libraries It adds undocumented features to DOM routines It doesn’t work with legacy IE It may conflict with future changes Given a project which references no other libraries, documents changes, and doesn’t give a damn for historical browsers: Is there any technical reason not to extend the Element prototype. Here is an example of how this is useful: Element