static-methods

问题 Is it possible to have static methods in Python which I could call without initializing a class, like: ClassName.static_method() 回答1: Yep, using the staticmethod decorator class MyClass(object): @staticmethod def the_static_method(x): print(x) MyClass.the_static_method(2) # outputs 2 Note that some code might use the old method of defining a static method, using staticmethod as a function rather than a decorator. This should only be used if you have to support ancient versions of Python (2.2

问题 Im new to JSF 2. My question is related to BalusC\'s answer to this question jsf2 ajax update parts based on request parameters I tried the kickstart code BalusC posted and I encountered an EL parsing error: /nameofpage.xhtml @12,64 rendered=\"#{bean.panels.contains(\'u1\')}\" Error Parsing: #{bean.panels.contains(\'u1\')} I guess that this is caused because I\'m not running a Servlet 3.0 / EL 2.2 capable container with a /WEB-INF/web.xml declared as per Servlet 3.0 spec. I\'m using Tomcat 6.

问题 I am wondering when to use static methods? Say if I have a class with a few getters and setters, a method or two, and I want those methods only to be invokable on an instance object of the class. Does this mean I should use a static method? e.g Obj x = new Obj(); x.someMethod or Obj.someMethod (is this the static way?) I\'m rather confused! 回答1: One rule-of-thumb: ask yourself "does it make sense to call this method, even if no Obj has been constructed yet?" If so, it should definitely be

问题 This question already has answers here : What is the difference between @staticmethod and @classmethod? (25 answers) Closed 11 months ago . Could someone explain to me the meaning of @classmethod and @staticmethod in python? I need to know the difference and the meaning. As far as I understand, @classmethod tells a class that it\'s a method which should be inherited into subclasses, or... something. However, what\'s the point of that? Why not just define the class method without adding

问题 Why is it not possible to override static methods? If possible, please use an example. 回答1: Overriding depends on having an instance of a class. The point of polymorphism is that you can subclass a class and the objects implementing those subclasses will have different behaviors for the same methods defined in the superclass (and overridden in the subclasses). A static method is not associated with any instance of a class so the concept is not applicable. There were two considerations driving

问题 Building a multi-language application in Java. Getting an error when inserting String value from R.string resource XML file: public static final String TTT = (String) getText(R.string.TTT); This is the error message: Error: Cannot make a static reference to the non-static method getText(int) from the type Context How is this caused and how can I solve it? 回答1: Since getText() is non-static you cannot call it from a static method. To understand why, you have to understand the difference