I’m a bit confused about how Java generics handle inheritance / polymorphism. Assume the following hierarchy – Animal (Parent) Dog – Cat (Children) So suppose I have a method...
How do I setup a class that represents an interface? Is this just an abstract base class? 17 s 17 To expand on the answer by bradtgmurray, you may...
The API Reference Scope page says: A scope can inherit from a parent scope. The Developer Guide Scope page says: A scope (prototypically) inherits properties from its parent scope....
What is the difference between public, private, and protected inheritance in C++? All of the questions I’ve found on SO deal with specific cases. 16 s 16 class A...
What are the differences between these two code snippets? Using type(): import types if type(a) is types.DictType: do_something() if type(b) in types.StringTypes: do_something_else() Using isinstance(): if isinstance(a, dict): do_something()...
Why does the following class declaration inherit from object? class MyClass(object): ... 6 Is there any reason for a class declaration to inherit from object? In Python 3, apart...
When planning out my programs, I often start with a chain of thought like so: A football team is just a list of football players. Therefore, I should represent...
If I inherit from a base class and want to pass something from the constructor of the inherited class to the constructor of the base class, how do I...
Why prefer composition over inheritance? What trade-offs are there for each approach? When should you choose inheritance over composition? 3 33
They are absolutely different. Inheritance is an “is-a” relationship. Composition is a “has-a”. You do composition by having an instance of another class C as a field of your...