You can do what you described by having a final field in your abstract class that is initialised in its constructor (untested code): abstract class Base { final String errMsg; Base(String msg) { errMsg = msg; } abstract String doSomething(); } class Sub extends Base { Sub() { super(“Sub message”); } String doSomething() { return … Read more
New keyword reference from MSDN: MSDN Reference Here is an example I found on the net from a Microsoft MVP that made good sense: Link to Original public class A { public virtual void One(); public void Two(); } public class B : A { public override void One(); public new void Two(); } B … Read more
In Python, methods are just key-value pairs in the dictionary attached to the class. When you are deriving a class from a base class, you are essentially saying that method name will be looked into first derived class dictionary and then in the base class dictionary. In order to “override” a method, you simply re-declare … Read more
My general rule is this – is the operation performed on the object or by the object? if it is done by the object, it should be a member operation. If it could apply to other things too, or is done by something else to the object then it should be a function (or perhaps … Read more
Of course. Declaring a class abstract only means that you don’t allow it to be instantiated on its own. Declaring a method abstract means that subclasses have to provide an implementation for that method. The two are separate concepts, though obviously you can’t have an abstract method in a non-abstract class. You can even have … Read more
This is undefined behavior from the C++11 draft standard section 6.6.3 The return statement paragraph 2 which says: […] Flowing off the end of a function is equivalent to a return with no value; this results in undefined behavior in a value-returning function. […] This means that the compiler is not obligated provide an error … Read more
Assuming the populate_Colours method is in the global namespace, you may use the following code, which exploits both that all object properties may be accessed as though the object were an associative array, and that all global objects are actually properties of the window host object. var method_name = “Colours”; var method_prefix = “populate_”; // … Read more
Yeah, it is quite vague. You should use it whenever for readers of the documentation of your method it may be useful to also look at some other method. If the documentation of your methodA says “Works like methodB but …”, then you surely should put a link. An alternative to @see would be the … Read more
Recent versions of git log learned a special form of the -L parameter: -L :<funcname>:<file> Trace the evolution of the line range given by “<start>,<end>” (or the function name regex <funcname>) within the <file>. You may not give any pathspec limiters. This is currently limited to a walk starting from a single revision, i.e., you … Read more
It is all about consistent semantics; In your question title you use getting data. This is extremely general in a sense that you need to define what getting means semantically significantly unambiguous way. I offer the follow examples to hopefully put you on the right track when thinking about naming things. getBooks() is when you … Read more