Every Java program (which is in turn, built up from one or more Java classes) requires a Main method. The purpose of this special method is to serve as an entry point to your program so that your program can be executed. More information can be found in this page. In your Pie example, what happens is that when … Read more
Yes. In fact Axel Schreiner provides his book “Object-oriented Programming in ANSI-C” for free which covers the subject quite thoroughly.
Do you mean this? In this case, Bar is the sub class.
As the documentation states [docs], In user defined base classes, abstract methods should raise this exception when they require derived classes to override the method, or while the class is being developed to indicate that the real implementation still needs to be added. Note that although the main stated use case this error is the indication … Read more
You should make your audioSounds and minTime members static: But I would consider using singleton objects instead of static members instead: Update from September 2020: Six years later, it is still one of my most upvoted answers on StackOverflow, so I feel obligated to add: singleton is a pattern that creates a lot of problems … Read more
Wow, a lot of big OOP terms being thrown around to this guy. Being one who started in procedural programming and is now mostly doing OOP, this is conceptually how I think of the difference (without all the big terms): In C, you have things called structs that can hold state. They kind of seem … Read more
Classes are the pillar of Object Oriented Programming. OOP is highly concerned with code organization, reusability, and encapsulation. First, a disclaimer: OOP is partially in contrast to Functional Programming, which is a different paradigm used a lot in Python. Not everyone who programs in Python (or surely most languages) uses OOP. You can do a … Read more
Though classmethod and staticmethod are quite similar, there’s a slight difference in usage for both entities: classmethod must have a reference to a class object as the first parameter, whereas staticmethod can have no parameters at all. Example Explanation Let’s assume an example of a class, dealing with date information (this will be our boilerplate): This class obviously could be used to store … Read more
Though classmethod and staticmethod are quite similar, there’s a slight difference in usage for both entities: classmethod must have a reference to a class object as the first parameter, whereas staticmethod can have no parameters at all. Example Explanation Let’s assume an example of a class, dealing with date information (this will be our boilerplate): This class obviously could be used to store … Read more
I know that Python does not support method overloading, but I’ve run into a problem that I can’t seem to solve in a nice Pythonic way. I am making a game where a character needs to shoot a variety of bullets, but how do I write different functions for creating these bullets? For example suppose … Read more