overriding

问题 I have this base type: typeA = function () { }; typeA.prototype = { do = function() { alert ("do something"); }, doMore = function() { this.do(); } } and an inherited type typeB: typeB = function () { }; typeB .prototype = new typeA(); typeB.prototype.do = function() { alert ("do something else"); }; When I create an instance of typeB and call doMore, I get an error indicating that this.do is not a function. Can I do this sort of thing in Javascript? 回答1: Is this example what you are looking

问题 When developing with Spring Data Mongodb, I want to do some customization in my MongoDB configuraion. General, I will extends the AbstractMongoConfiguration, and implement the abstract methods . currently, the AbstractMongoConfiguration class has the following: @Configuration public abstract AbstractConfiguration extends MongoConfigurationSupport { public abstract MongoClient mongoClient(); @Bean public MongoTemplate mongoTemplate() throws Exception { return new MongoTemplate(mongoDbFactor(),

问题 I have KeyEvent.KEY_TYPED on my TextField s. If user pastes data with keyboard shortcut, event gets triggered. But it doesn't work if user pastes with right click on mouse. I found this solution that solves this issue. But I have many TextField s, can I override method for all TextField s at once, but only for current class I'm working on? 回答1: public class NewTextField extends TextField { @Override public void paste() { super.paste(); System.out.println("text pasted in"); } } Use

问题 I'm using ASP.NET Boilerplate framework for ASP.NET Core. I have the boilerplate OData controllers as per https://aspnetboilerplate.com/Pages/Documents/OData-AspNetCore-Integration. I want to support passing of a custom parameter in either the GET method or in a custom OData function. How do I do this in the AbpODataEntityController ? Regards, David 回答1: Looking at the source code, it looks like they are using the standard "Microsoft.AspNet.OData" Version="7.1.0". So you probably have a place

问题 After having updated from Rails 3 to Rails 4 and installing the Bootstrap gem for Spree I get an error in app/views/spree/products/_image.html.erb . The page looks as follows after I click on a image of a product on the main page: NameError in Spree::Products#show Showing []/ruby/1.9.1/bundler /gems/spree_bootstrap-a529d6bb6db0/app/views/spree/products/_image.html.erb where line #1 raised: undefined local variable or method `image' for #<#<Class:0x000000070139c8>:0x000000068d7da8> Extracted

问题 Hii howto override itemclick in gridpanel on ExtJS4 ? I have gridpanel with alias tableA like this : Ext.define('AM.test.TableA', { extend: 'Ext.grid.Panel', alias: 'widget.tableA', initComponent: function() { // tableA configurations this.callParent(arguments); } }); And my tableA controller like this : Ext.define('AM.test.TableAController', { extend: 'Ext.app.Controller', init: function() { this.control({ 'tableA': { itemclick: this.tableSelection } }); }, tableSelection: function(grid,

问题 I've got a question concerning polymorphic methods. I've got two classes: the base class with the non-virtual method Foo( ) which calls its virtual method Foo (int i) (like this: Foo() {Foo(1);}) and the derived class which overrides method Foo(int i) . If I call Foo() method of an instance of the derived class the walkthrough is as the following: base Foo() -> override Foo(int i) . But if I change override method to new the walkthrough is as the following: base Foo -> base Foo(int i) . It

问题 can i overload or override methods just by using different return value ? is virtual matter in thie case ? for example : class A{ virtual int Foo(); // is this scenario possible with/without the keyword virtual } class B : public A { virtual double Foo(); } A* Base = new B(); int i = Base->Foo(); // will this just convert double to int ? and regarding overloading : class A{ virtual int Foo(); virtual float Foo(); // is this possible ? int Goo(); float Goo(); // or maybe this ? } Class B{

问题 i'm looking for the best way to overrid a method in a custom module node.js. I'm working on a custom middleware who will help me to automatically load some custom module. Like security, users etc... But i want to be able to override some methods if i need something like a custom security hand check. For now the only way i found is to export a function who will replace my method and expose context variables. // CUSTOM MODULE EXAMPLE // ======================================== var myVar =

问题 public class B extends A{ public static void main(String[] args) { new B().privateMethod();//no error -output B-privateMethod.Sounds like overriding new B().staticMethod(); //no error -output B-StaticMethod.Sounds like overriding } private void privateMethod() { System.out.println("B-privateMethod."); } static void staticMethod() { System.out.println("B-StaticMethod."); } } class A{ private void privateMethod() { System.out.println("A-privateMethod."); } static void staticMethod() { System