class

问题 This question already has answers here : Java doesn't support multiple inheritance but implicitly every class in java extends Object and allows one more [duplicate] (8 answers) Closed 4 years ago . In this tutorial (http://www.studytonight.com/java/object-and-classes) I read that a java class may optionally extend one parent class. By default, it will extend java.lang.Object. Note: important statement that i was read that Java enums extend the java.lang.Enum class implicitly, so your enum

问题 Here is my example.py file: from myimport import * def main(): myimport2 = myimport(10) myimport2.myExample() if __name__ == "__main__": main() And here is myimport.py file: class myClass: def __init__(self, number): self.number = number def myExample(self): result = myExample2(self.number) - self.number print(result) def myExample2(num): return num*num When I run example.py file, i have the following error: NameError: global name 'myExample2' is not defined How can I fix that? 回答1: Here's a

问题 in my Module.php i have the fallowing methods that i would like to move them in a factory class so that i wont clutter the Module class : public function getControllerConfig() { return array( 'factories' => array( 'account-index' => function ($controllerManager) { $serviceManager = $controllerManager->getServiceLocator(); $accountService = $serviceManager->get('account-service'); return new Controller\IndexController($accountService); } ) ); } public function getServiceConfig() { return array

问题 This question already has answers here : Why do I get “unresolved external symbol” errors when using templates? [duplicate] (3 answers) Closed 6 years ago . I get this error a LOT, and i never know why. Can someone help me find the cause of it? Edit:Removed code 回答1: Put the implementation (your method definitions) into the header along with the class declaration (see this in the C++ FAQ). Some compilers have supported an "export" keyword for doing it the way that you did, but that has been

问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 6 years ago . I've seen so many different posts about what way you're supposed to serialize an object to a file, and all of them conflict in nature on how to do it and what the best practices are. So here's what I'm trying to save: public class IHandler{ public double currentLoad; public String currentPrice;

问题 I have a project and I'm required to produce the class and sequence diagram. It is a procurement website. My only problem is that I don't know how to associate the web pages (user interfaces) to these diagrams. If they are not needed what is the right way for me to include it in the diagrams because from a book I read there are "UserInterface" classes, so another question, what should be inside of these UI classes.Can someone give me an example. Thanks! 回答1: There are several levels of

问题 I have a project and I'm required to produce the class and sequence diagram. It is a procurement website. My only problem is that I don't know how to associate the web pages (user interfaces) to these diagrams. If they are not needed what is the right way for me to include it in the diagrams because from a book I read there are "UserInterface" classes, so another question, what should be inside of these UI classes.Can someone give me an example. Thanks! 回答1: There are several levels of

问题 I have something like this: string = "Post" I would like to convert the string to a class name literal. I use eval like this to convert the string: eval(string) #=> Post Being a javaScript developer I try to avoid eval. Is there a better way of doing this in Ruby? Or is using eval the preferred way of handling this? 回答1: You can try class Post end Object.const_get("Post") Which returns the Post class 回答2: Use Module.const_get string = "Fixnum" clazz = Object.const_get(string) clazz.name # =>

问题 Ok, so this may be a bit of a silly question, and there's certainly the obvious answer, but I was curious if I've missed any subtleties here. Is there any difference in terms of visibility/usability between a public member declared in an internal class and an internal member declared in an internal class? i.e. between internal class Foo { public void Bar() { } } and internal class Foo { internal void Bar() { } } If you declared the method as public and also virtual , and then overrode it in a

问题 I'm trying to use class objects with the Arduino, but I keep running into problems. All I want to do is declare a class and create an object of that class. What would an example be? 回答1: On Arduino 1.0, this compiles just fine: class A { public: int x; virtual void f() { x=1; } }; class B : public A { public: int y; virtual void f() { x=2; } }; A *a; B *b; const int TEST_PIN = 10; void setup() { a=new A(); b=new B(); pinMode(TEST_PIN,OUTPUT); } void loop() { a->f(); b->f(); digitalWrite(TEST