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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 A class is a blueprint which you use to create objects An object is an instance of a class - it's a concrete 'thing' that you made using a specific class So, 'object' and 'instance' are the same thing, but the word 'instance' indicates the relationship of an object to its class This is easy to understand if you look at an example For example, suppose you have a class House Your own house
What is the { get; set; } syntax in C#? - Stack Overflow I am learning ASP NET MVC and I can read English documents, but I don't really understand what is happening in this code: public class Genre { public string Name { get; set; } } What does this
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?
How does the @property decorator work in Python? The property itself is read-only (unless you try to modify it on the class itself, not an instance of the class), it's just that Python has no obvious support for read-only attributes (best you can do is subclass tuple and use the tuple 's storage for the values, with named properties providing friendlier access; this is what collections
OOP Terminology: class, attribute, property, field, data member Class variable is an attribute defined in a class of which a single copy exists, regardless of how many instances of the class exist So all instances of that class share its value as well as its declaration Field is a language-specific term for instance variable, that is, an attribute whose value is specific to each object
class - What is the difference between private and protected members of . . . The derived class should be a type of your class, and the protected data of the base class is part of the data of the derived class The writer of the derived class is expected to handle this data properly or it is a bug Private data in a base class is, however, something the writer of the derived class does not control