extend | 易学教程

PHP: Sub class static inheritance - children share static variables?

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问题 As you can see below I have a super class (Article) and two sub classes. I want each of the sub classes to have a static array that shall hold all it's objects. abstract class Article { public static $articles = array(); // Variable for storing all the objects of each sub-class. public function add_Object_To_Array() { array_push(self::$articles, $this); } } class Report extends Article{} class Interview extends Article{} -Making two Report objects and adding them to their array: $tmp = new

How can I extend $q promise in Angularjs with a .success and .error

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I wrote this little code in a custom service in AngularJS. In my service: var deferred = $q.defer(); var promise = deferred.promise; deferred.resolve('success'); deferred.reject('error'); /* Handle success and error */ promise.success = function(fn) { promise.then(function(response) { fn(response); }); return promise; }; promise.error = function(fn) { promise.then(null, function(response) { fn(response); }); return promise; }; In my controller: promiseService.myPromise() .success(function(data){ $scope.success= data; }) .error(function(data){ $scope.error = data; }); I juste Handle the Success

Extending a EditText in Android. What am I doing wrong?

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问题 So I'm trying to get a grasp of using custom controls in Android. But my app crashes on trying to create the activity. Here's the code: package com.myApp; import android.content.Context; import android.widget.EditText; import android.view.View; import android.view.View.OnClickListener; public class MyEditText extends EditText implements OnClickListener { public MyEditText(Context context) { super(context); // TODO Auto-generated constructor stub } public void FlashBorder() { //do some custom

Better way to call superclass method in ExtJS

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All the ExtJS documentation and examples I have read suggest calling superclass methods like this: MyApp.MyPanel = Ext.extend(Ext.Panel, { initComponent: function() { // do something MyPanel specific here... MyApp.MyPanel.superclass.initComponent.call(this); } }); I have been using this pattern for quite some time and the main problem is, that when you rename your class then you also have to change all the calls to superclass methods. That's quite inconvenient, often I will forget and then I have to track down strange errors. But reading the source of Ext.extend() I discovered, that instead I

Extending Application

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I'd like to extend Application in my Android app. I've done this such that I've created an extended Application object called MyApplication and added it to the manifest. I'd now like to add some getters and setters to hold some information. It looks like I'll need to pass the application Context to any classes which do not contain a Context. For example, say I create a class called MyObject (in its own java file): public class MyObject { public void doStuff() { // do stuff } } How might I access MyApplication from doStuff()? It looks like I'll need to pass the application Context to MyObject.

How to extend DataRow and DataTable in C# with additional properties and methods?

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问题 I would like create a custom DataRow that will have -let's say- a propery called IsCheapest. public class RateDataRow : DataRow { protected internal RateDataRow(DataRowBuilder builder) : base(builder) { } public bool IsCheapest { get; set ;} } And I want to have a new DataTable that contains only ***RateDataRow***s so that .NewDataRow() returns RateDataRow instance as a new row. what should be the implementation on the class that extends DataTable? Thanks, 回答1: From your question it's not

Default class that is extended by all classes in java

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Is there any Default Class that is extended by all the classes by default in Java? Example: If I have a simple class like: Class A { String a; } Is this class extending a class by default? java.lang.Object class is superclass of all classes. Class Object is the root of the class hierarchy. Every class has Object as a superclass. All objects, including arrays, implement the methods of this class. You can test it : A a = new A(); if(a instanceof Object){ System.out.println("Object is superclass of all classes"); } In Java, everything (apart from the plain old data types; int, boolean, double etc

How do you extend Kendo UI widgets

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问题 I couldn't find any official documentation about extending Kendo UI widgets or making composite controls on Kendo UI's website. Are there any examples of how to do this? 回答1: I'm about to write a post on this, but you can checkout the following project on GitHub for creating plugins. Currently there is a composite control for this... https://github.com/kendo-labs/kendo-plugins Here is a live fiddle example of a compositing an AutoComplete and a ListView... http://jsfiddle.net/burkeholland

implements vs extends in generics in Java

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问题 Can someone tell me what the differences between the first and second codes are? MaxPQ stands for priority queue, which is a collection of "Key" objects that can be compared with each other. Code 1: public class MaxPQ<Key extends Comparable<Key>>{ ... } Code 2: public class MaxPQ<Key implements Comparable<Key>>{ ... } The second code doesn't compile, but it is not intuitive to me why we need to extend instead of implement interfaces when using a generic. 回答1: The difference is pretty

Sass extend with pseudo selectors

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I am using compass to manage some sass files on mac osx. I have these files: sass/ screen.scss partials folder/ ... _fonts.scss _functions.scss ... In fonts I have this rule which I would like to reuse @extend. //fonts.scss .icon-ab-logo, { font-family: 'icomoon'; speak: none; font-style: normal; font-weight: normal; font-variant: normal; text-transform: none; line-height: 1; -webkit-font-smoothing: antialiased; } .icon-ab-logo:before { //i want to reuse this. content: "\e000"; } In functions I have this screen.scss: .logo { position: absolute; top: 0; bottom: 0px; z-index: 500; width: 9.5em;