overriding

问题 I have a integer variable, for example, timeSignature, declared it in .h file, and synthesized a pair of setter/getter methods: in .h: @interface Metronome : NSObject { int timeSignature; } @property (nonatomic) int timeSignature; in .m: @synthesize timeSignature; I wish to override the setter method: when user set a new value to it, it does something else as well as changing to new value: - (void) setTimeSignature:(int)timeSignature { self.timeSignature = timeSignature; //hides instance

问题 I am making a Java application similar to that of the Banko applet. I was coming along just fine when I hit the "public void init()" method. When I was finished, everything compiled except for that. It told me to add an @Override annotation. I tried that, but whenever I do, regardless of where I put it, the compiler fails with the following error: cannot find symbol symbol: class Overrides location: class aBomb.Bomb I have no idea what could be preventing the application from executing

问题 I have a div classed content. Inside the div , is a h1 tag. Inside the h1 tag is a span tag, with its' class set to regTalker. Here is the tag: <h1><span class="regTalker">Not Listed? Register <a href="?register">here</a></span>Browse Listings</h1> The regTalker class looks like this: .regTalker { text-align: left !important; font-family: GoodDog; font-size: 0.7em; color: #000; } The container div has text-align value set to center. The main string inside of the h1 tag displays centered. The

问题 Maybe I am wrong, but this seems to be a very basic question. Suddenly my inheritance chain stopped working. Writing a small basic test application proved that it was me that was wrong (so I can't blame the compiler). I have a base class, with the default behavior in a virtual function. A child class derives from that and changes the behavior. #include <iostream> class Base { public: Base() { print(); } ~Base() {} protected: virtual void print() { std::cout << "base\n"; } }; class Child :

问题 I mean, If i do: #item { background:url('image.jpg');} and then in another stylesheet i do #item {background:red;} will the browser load image.jpg and then cancell it and set red, or will go straight to red? (without loading the image) thanks! 回答1: It will do both, since those two statements are the same as #item { background: red url('image.jpg'); } or #item { background-color: red; } #item { background-image: url('image.jpg'); } In both cases, the background will have an image, and the

问题 I have a method set in my superclass... public void explain() { for (Item item: Instances) { System.out.println(item.getname + " is in location " + item.place): } } I need to override this same method in the subclass to print out the original output message but the new instance for this method needs to print out different values that have been set in the subclass I'm confused with the overriding bit (as I know little about it) and would like an explanation. 回答1: So just give the method in

问题 I have an abstract class with a pure virtual function f() and i want to create a class inherited from that class, and also override function f(). I seperated the header file and the cpp file. I declared the function f(int) in the header file and the definition is in the cpp file. However, the compiler says the derived class is still abstract. How can i fix it? 回答1: The functions f() and f(int) do not have the same signature, so the second would not provide an implementation for the first. The

问题 I am running Prestashop 1.6.1.7 and I have the following pictureUpload() method that allows users to upload files of their choosing. By default Prestashop allows uploads of GIF, JPG, JPEG or PNG only. I'm trying to allow users the ability to upload a few more types (pdf, ai and eps specifically) Here is the pictureUpload() method in the productController override: protected function pictureUpload() { if (!$field_ids = $this->product->getCustomizationFieldIds()) { return false; } $authorized

问题 I'm trying to learn more about the .egg concept and overriding methods in Python. Here's the error message I'm receiving: Traceback (most recent call last): File "C:/local/work/scripts/plmr/plmr_db.py", line 42, in <module> insp.reflecttable(reo_daily_table, column_list) File "build\bdist.win32\egg\sqlalchemy\engine\reflection.py", line 370, in reflecttable File "build\bdist.win32\egg\sqlalchemy\engine\reflection.py", line 223, in get_columns File "build\bdist.win32\egg\sqlalchemy\engine\base

问题 I'm using the Fosuserbundle to manager members in my project { SF::3.4.8 }, when trying to override the controller of the registrationController by following the Symfony documentation <?php namespace TestUserBundle; use Symfony\Component\HttpFoundation\Request; use Symfony\Component\HttpFoundation\RedirectResponse; use FOSUserBundle\Controller\RegistrationController as BaseController; class RegistrationController extends BaseController { public function registerAction(Request $request) { die(