overriding

I've been working on an iOS application in Swift (much of it being moved from Objective-C). I'm using Core Data and trying to use extensions to add functionality to classes auto-generated from my model. One thing I readily did in Objective-C was to add a method in a category on class A and override that method in a category on class B (which derived from A), and I was hoping to do the same in Swift. For a while now I've had the following code in my project (and this is just one example), and though I have not used the functionality yet, the compiler has worked just fine compiling this code: //

I have this Base class: abstract class Base { public int x { get { throw new NotImplementedException(); } } } And the following descendant: class Derived : Base { public int x { get { //Actual Implementaion } } } When I compile I get this warning saying Derived class's definition of x is gonna hide Base's version of it. Is is possible to override properties in c# like methods? Jeffrey Zhao You need to use virtual keyword abstract class Base { // use virtual keyword public virtual int x { get { throw new NotImplementedException(); } } } or define an abstract property: abstract class Base { //

Suppose I have two Classes, A and B. The A class is defined as abstract, while B extends this abstract class, and finally i test the result and both classes are part of same package. public abstract class A { protected abstract void method1(); protected void method2() { System.out.println("This is Class A's method"); } } public class B extends A { @Override protected void method1() { System.out.println("This is B's implementaiton of A's method"); } } and now when i test them: B b = new B(); b.method1(); b.method2(); I get expected output: This is B's implementaiton of A's method This is Class

The values in my enum are words that need to have spaces in them, but enums can't have spaces in their values so it's all bunched up. I want to override toString() to add these spaces where I tell it to. I also want the enum to provide the correct enum when I use valueOf() on the same string that I added the spaces to. For example: public enum RandomEnum { StartHere, StopHere } Call toString() on RandomEnum whose value is StartHere returns string "Start Here" . Call valueof() on that same string ( "Start Here" ) returns enum value StartHere . How can I do this? You can try out this code. Since

I'm working on pypreprocessor which is a preprocessor that takes c-style directives and I've been able to make it work like a traditional preprocessor (it's self-consuming and executes postprocessed code on-the-fly) except that it breaks library imports. The problem is: The preprocessor runs through the file, processes it, outputs to a temporary file, and exec() the temporary file. Libraries that are imported need to be handled a little different, because they aren't executed, but rather they are loaded and made accessible to the caller module. What I need to be able to do is: Interrupt the