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syntax - What does Class lt;? gt; mean in Java? - Stack Overflow Class is a parameterizable class, hence you can use the syntax Class<T> where T is a type By writing Class<?>, you're declaring a Class object which can be of any type (? is a wildcard) The Class type is a type that contains meta-information about a class It's always good practice to refer to a generic type by specifying his specific type, by using Class<?> you're respecting this practice
The difference between Classes, Objects, and Instances The class House describes the concept of what a house is, and there are specific, concrete houses which are objects and instances of class House Note: This is exactly the same in Java as in all object oriented programming languages
class - Understanding Python super () with __init__ () methods - Stack . . . next_class __init__(self) break If we didn't have the super object, we'd have to write this manual code everywhere (or recreate it!) to ensure that we call the proper next method in the Method Resolution Order! How does super do this in Python 3 without being told explicitly which class and instance from the method it was called from?
c++ Incomplete type not allowed error accessing class reference . . . In short there are two classes, Player and Ball, which both need to use information from the other Both at some point in the code will be passed a reference of the other (from another class that will include both h files) After reading up on it, I removed the #include h files from each one and went with forward declaration
What is the best way of implementing a singleton in Python? Logger in the code above will be of type class 'your_module Singleton', just as the (only) instance of Logger will be of type class 'your_module Logger' When you call logger with Logger(), Python first asks the metaclass of Logger, Singleton, what to do, allowing instance creation to be pre-empted
c# - When to use record vs class vs struct - Stack Overflow A struct, a class and a record are user data types Structures are value types Classes are reference types Records are by default immutable reference types When you need some sort of hierarchy to describe your data types like inheritance or a struct pointing to another struct or basically things pointing to other things, you need a reference