overriding

问题 Are there ways where I can use jQuery to improve the performance of a file uploader? There's a system where I am trying to hack to make the uploading process better. I am just doing some frontend override as I don't have permission to their server files. The current uploader looks something like this: <ul> <li> <input type="file"></li> <li> <input type="file"></li> <li> <input type="file"></li> <li> <input type="file"></li> <li> <input type="file"></li> </ul> The downside using this is, you

问题 Consider this: class A { int x =5; } class B extends A{ int x =6; } public class CovariantTest { public A getObject() { return new A(); } /** * @param args the command line arguments */ public static void main(String[] args) { // TODO code application logic here CovariantTest c1 = new SubCovariantTest(); System.out.println(c1.getObject().x); } } class SubCovariantTest extends CovariantTest { public B getObject(){ return new B(); } } As far as I know, the JVM chooses a method based on the true

问题 I have got multiple classes which each implement multiple different methods within each. Now the problem statement is that I wish to use the methods from all these (maybe around ~200 such different class files/methods) in another class file which all different methods from the above class files. I thought that if I implement an interface which has all these various methods listed, then I just call/import/reference that single interface and can use all the methods? But I am stuck, as this

问题 Is it possible to have class A with an empty method say render() .. then you create 3 instances of the class, so you have objects b, c, d , so can I THEN assign bodies for the render method for each object? Here's an example, in JavaScript you can have an object say a and then anywhere you can say a.method = function() { /* do something */ } After that line, you will have a method with the name method for the object a and whenever called it will /* do something */ . Is this possible in Java

问题 I'm getting some compiler errors in Xcode 6 using Swift which I have a hard time wrapping my head around. I'm trying to create a scene by subclassing SCNScene, but keep getting errors on the initialisers. The basic structure of my code is: class SpaceScene: SCNScene { override init(named: String) { super.init(named: named) } } This results in an error on line 2 with the message "Initializer does not override a designated initializer from its superclass", although SCNScene clearly has such an

问题 I have a base class MyScreen & I would like to always call the function initComponents() inside its constructor, even for sub classes of this class. But if the sub-class has overridden the initComponents() function, then I want MyClass to call the Sub-classes version of initComponents() not the super classes(MyScreen) version of initComponents(). Is it possible to do this from within MyClasses constructor? class MyScreen { public: MyScreen() { // a child of this class (& any instance of this

问题 How can I switch to a different theme template file for any node that I want? I understand how to create sub-themes like node-recipes.tpl.php for a node that has a path of "recipes". But what I want to have control of the entire base template like page.tpl.php. Can I use some preprocess function in template.php for this? Right now I have this in my template.php file: function mythemename_preprocess_node(&$vars) { // template name for current node id $suggestions = array('node-'. $vars['nid'])

问题 I have a Website that has some double click functionality and so with android when you double click in the browser it will just zoom. So I am building a WebView so I can over ride the double click and make it react like it should. public class myWebView extends Activity{ GestureDetector gs = null; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); WebView engine = (WebView) findViewById(R.id.web_engine); engine

问题 I would like to know how have I do to add a field in the customer administration at system->configuration->Customer settings panel. Have I create the system.xml file from the core and paste in the local folder with the same path? and have I maintain all the content of the file or I can write only the portion interested? thanks 回答1: You should create a module to hold your customizations. Within this module create a system.xml file that only overrides/adds what you want to your configuration

问题 I have a feathersjs service created using the feathers generate service command. I want to override its definition of create method. This is my service class /* eslint-disable no-unused-vars */ // Initializes the `userGroup` service on path `/usergroup` const createService = require('feathers-sequelize'); const createModel = require('../../models/user-group.model'); const hooks = require('./user-group.hooks'); const filters = require('./user-group.filters'); const async = require('async');