The new pycharm release (3.1.3 community edition) proposes to convert the methods that don’t work with the current object’s state to static. What is the practical reason for that? Some kind of micro-performance(-or-memory)-optimization? 10 Answers 10
When I attempt to use a static method from within the body of the class, and define the static method using the built-in staticmethod function as a decorator, like this: class Klass(object): @staticmethod # use as decorator def _stat_func(): return 42 _ANS = _stat_func() # call the staticmethod def method(self): ret = Klass._stat_func() + Klass._ANS … Read more
In Java, I’d like to have something as: class Clazz<T> { static void doIt(T object) { // … } } But I get Cannot make a static reference to the non-static type T I don’t understand generics beyond the basic uses and thus can’t make much sense of that. It doesn’t help that I wasn’t … Read more
Let’s say I have a class designed to be instantiated. I have several private “helper” methods inside the class that do not require access to any of the class members, and operate solely on their arguments, returning a result. public class Example { private Something member; public double compute() { double total = 0; total … Read more
What is the difference between the following class methods? Is it that one is static and the other is not? class Test(object): def method_one(self): print “Called method_one” def method_two(): print “Called method_two” a_test = Test() a_test.method_one() a_test.method_two() 13 Answers 13
Let’s say I have, or am going to write, a set of related functions. Let’s say they’re math-related. Organizationally, should I: Write these functions and put them in my MyMath namespace and refer to them via MyMath::XYZ() Create a class called MyMath and make these methods static and refer to the similarly MyMath::XYZ() Why would … Read more
ReSharper likes to point out multiple functions per ASP.NET page that could be made static. Does it help me if I do make them static? Should I make them static and move them to a utility class? 14 Answers 14
I have a class that must have some static methods. Inside these static methods I need to call the method getClass() to make the following call: public static void startMusic() { URL songPath = getClass().getClassLoader().getResource(“background.midi”); } However Eclipse tells me: Cannot make a static reference to the non-static method getClass() from the type Object What … Read more
EDIT: As of Java 8, static methods are now allowed in interfaces. Here’s the example: public interface IXMLizable<T> { static T newInstanceFromXML(Element e); Element toXMLElement(); } Of course this won’t work. But why not? One of the possible issues would be, what happens when you call: IXMLizable.newInstanceFromXML(e); In this case, I think it should just … Read more
Why is it not possible to override static methods? If possible, please use an example. 22 s 22 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 … Read more
