overriding

问题 Today I've finally got my facebook implementation working and when I started to implement it in my application I get the following errors over @Override. The method onComplete(Bundle) of type FBConnectionActivity.LoginDialogListener must override a superclass method If I remove the @Override the error is solved, but I would like to understand why it is complaining about this in one application and not the other. I've got the following code. public abstract class FBConnectionActivity extends

问题 I have a project where I want to be able to iterate across an instance of a class and find all methods that are marked public virtual. Then I want to override the instance of the class so that when the method is called I can call a different set of code. I know how to find all methods that are public in a class using reflection, but I cannot figure out how to override virtual methods. Basically I am giving a proxy object to use, and when they call the method, I want to call a method on the

问题 I needed a datecolumn with some custom behaviour, specifically I needed to be able to enter in a date or and age in the same field (with an age staying rendered as an age and a date staying rendered as a date) Eg. Entering "23" will leave "23" in the field as a valid value, or entering "22/1/88" will leave "22/1/88" as valid value. So I tried having a datecolumn with the editor defined like this (note the validate override): editor: { xtype: 'datefield', format: 'd/m/Y', validate: function(){

问题 I'm need of custom artifact installation and can't figure how to override the default one (from default maven lifecycle). So my question is: How to configure maven install plugin in my pom.xml so it doesn't do default install and executes just my custom install-file goals? I tried without id and with default-install id and it didn't help. Update: From the provided answer - this does not work for me (I see two install attempts in log). <pluginManagement> <plugins> <plugin> <groupId>org.apache

问题 I'm using a thousand instances of a closed DllClass in my project. public sealed class DllClass { public DllClass(); public string DllClassProperty {get; set;} } DllClassProperty set is used a thousand of times and I need to override the value set if a parameter is set on Web.config. I found this Interface INotifyPropertyChanged, but I can't use it, because I don't have access to the class and I can't extend it. I'm thinking, if there's a way to do something like this, but I think this is not

问题 I'm trying to override as_json in one of my models, partly to include data from another model, partly to strip out some unnecessary fields. From what I've read this is the preferred approach in Rails 3. To keep it simple, let's say I've got something like: class Country < ActiveRecord::Base def as_json(options={}) super( :only => [:id,:name] ) end end and in my controller simply def show respond_to do |format| format.json { render :json => @country } end end Yet whatever i try, the output

问题 Imagine this simple base class: struct simple_http_service { virtual reply http_get(…); virtual reply http_post(…); virtual reply http_delete(…); // etc. }; I'd like to prevent the user from deriving from this class without overriding at least one of these and prevent them from instantiang simple_http_service Is there some nice way to do this? 回答1: That sounds like a really odd constraint. By all means protect the user from incorrect usage, but don't try to prohibit things that you just "can

问题 I have a superclass, which two methods i want to override. Here's my code: public class MyCustomClass extends SomeSuperClass { protected MyCustomClass(params) { super(params); } @Override public void method1() { super.method1(); /* here goes my code */ } @Override public void method2() { super.method2(); /* here goes my another code */ } I have some constructor, that passes SomeSuperClass object as a parameter, and what i do next: MyCustomClass object; /* now i have object of type

问题 I have a situation similar to these two posts (1907297 AND 689684) and to describe my situation most concisely, I present this text/graphical layout (similar to what you'd see in IB, dots used to enforce indent levels) UIView (MainView: 320x460) . .UIScrollView (ScrollView: 320x460) . .UIView (OverlayView: 320x40) . . . .UIButton (ArbitraryButton1) . . . .UILabel (ArbitraryLabel1) . . . .UILabel (ArbitraryLabel2) The goal here is for the OverlayView to serve as a unified, transparent

问题 What I have known till now is that a subclass if overriding a superclass method should throw the same exception or a subclass of the exception. For example: This is correct class SuperClass { public int doIt(String str, Integer... data)throws ArrayIndexOutOfBoundsException{ String signature = "(String, Integer[])"; System.out.println(str + " " + signature); return 1; } } public final class SubClass extends SuperClass { public int doIt(String str, Integer... data) throws