extending

问题 I have a base class, which is as follows: public Data() { id = num++; SetVariables(); } //fill every Variable varNames, parseInduction, noise, seperator in Children Classes public Data(String line) { //first declare all variables in sub classes if (id == 0) throw new NotSupportedException("You are not allowed to use this constructor for creating the first instance!"); id = num++; SetVariables(); parseLine(line); } And i also have a Sub Class extending this Class. class DienstGruppe : Data {

问题 I discovered a method of extending the core jQuery init function (which is what gets called anytime you use the $() or jQuery() function). This is not possible using the ordinary proxy pattern but the following code makes it work: var origInit = jQuery.fn.init; jQuery.fn.init = function(selector, context, rootjQuery) { if (some condition) { //custom code here, possibly returning some other jQuery object than //what jQuery would normally return } return origInit.call(jQuery.fn, selector,

问题 This question already has answers here : Get all derived types of a type (8 answers) Get all inherited classes of an abstract class [duplicate] (4 answers) Closed 5 years ago . During runtime , I would like to populate a drop down list with classes that have extended my base class. Currently I have an enum, and this is what I use to populate that list, but I want to add additional classes (and other people are adding classes) and do not want to have to maintain an enum for this purpose. I

问题 Is it possible to call parent method in JavaScript class but to still have access to prototype methods from parent and child class. Here is code example: var Base = function() { this.baseMethod = function(){ return 'baseMethod'; }; this.baseInitMethod = function() { return 'baseInitMethod'; } } Base.prototype.basePrototypeMethod = function() { return "basePrototypeMethod"; }; var Specific = function() { Base.call(this); this.baseInitMethod = function() { // call baseInitMethod from Base class

问题 I'm trying to extend the default JQuery interface and the default object jQuery by a function in TypeScript Code /// <reference path="jquery.d.ts" /> namespace MyNameSpace { var $ = jQuery; export interface JQuery { test(options: Object): JQuery; } $.fn.test = function(options: Object): JQuery { if (this.length === 0) { console.log('Error!'); return this; } console.log(options); return this; } export var testBody = function() { jQuery('body').test({ 'HELLO': 'TEST' }); } } The Problem Now I'm

问题 Im' trying to use the extension "-Xinject-code" of xjc to add some code to my generated classes. For the following simple xsd schema... <?xml version="1.0" encoding="UTF-8"?> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"> <xs:element name="MyList" > <xs:complexType> <xs:sequence> <xs:element ref="MyItem" maxOccurs="unbounded"/> </xs:sequence> </xs:complexType> </xs:element> <xs:element name="MyItem"> <xs:complexType> <xs:sequence> <xs:element name="id" type="xs:int"/> <xs:element

问题 The story: I'm trying to interface from C to Python in order to use the faster computational speed of C for an existing Python code. I already had some success, also with passing NumPy arrays - but now there seems to be an issue and I can't resolve it. This is the code: #define FORMAT_VALUE_T "d" char format_buffer[32]; typedef struct { PyObject_HEAD PyArrayObject *invmat; unsigned order; value_t weight, *buffer; } Det; typedef double value_t; typedef struct { PyObject_HEAD Det *det; value_t

问题 I try to extend UI dialog according to documentation (UI version 1.8.16): (function($) { $.widget('ui.mydialog', $.extend(true, $.ui.dialog.prototype, { _create: function() { return $.Widget.prototype._create.apply(this, arguments); } })); })(jQuery); $(function() { $('div#dialog').mydialog(); }); Executing of this code causes JS error: "this.uiDialog is undefined". And if try to override the _init() method there are no errors, but parent method call takes no effect. I'm confused.. Which way

问题 I'm totally new to Android (Java) Development and I'm so excited about it! The developers guide of Google is fantastic and I learned a lot in a small time. It even keeps me awake during the night ;) Today I went through making menu's and there's something that I can't understand. It's about extending classes. The guide says: Tip: If your application contains multiple activities and some of them provide the same Options Menu, consider creating an activity that implements nothing except the

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