program-flow

I copy a piece of code from SO as an example. The subroutine contains an error handler. Should one make an error handler for all Subs? Public Sub SubA() On Error Goto ProcError Connection.Open Open File for Writing SomePreciousResource.GrabIt ProcExit: Connection.Close Connection = Nothing Close File SomePreciousResource.Release Exit Sub ProcError: MsgBox Err.Description Resume ProcExit End Sub And by the way, how does the flow of the control inside a subroutine when the code executor encounter a Exit Sub , End Sub and Resume ? And when it encounters a label such as ProcError: during the

So as you may be able to tell from my attempt, I'm trying to figure out how I'd make a program which gives the user 5 seconds to enter some lines of text, then the Scanner will count how many lines were entered. I've just started learning Java as my 2nd language, so please try to explain everything as simply as possible :) I've got two theories as to why it's not working. The first is that nextLine() will return the whole line, regardless of whether it's empty or not meaning rather than NL equaling "", it will actually equal the whole line (ie " "). And my second theory is that I've got no

This is what I'm doing now. Is there a better way to access the super class? public class SearchWidget { private void addWishlistButton() { final SearchWidget thisWidget = this; button.addClickHandler(new ClickHandler() { public void onClick(ClickEvent event) { // A better way to access the super class? // something like "this.super" ...? workWithWidget(thisWidget); } } } } I'm programming with Google Web Toolkit, but I think this is really a generic Java question. polygenelubricants You can use what is called the qualified this . JLS 15.8.4. Qualified This Any lexically enclosing instance can

I've been developing Web applications for a while now and have dipped my toe into GUI and Game application development. In the web application (php for me), a request is made to the file, that file includes all the necessary files to process the info into memory, then the flow is from Top to Bottom for each request. (mainly) I know that for Games the action happens within the Game Loop, but how are all the different elements of a game layered into that single loop (menu system, gui, loading of assets and the 3d world) with the constant loading and unloading of certain things. Same for GUI

One thing I've sometimes wondered is which is the better style out of the two shown below (if any)? Is it better to return immediately if a guard condition hasn't been satisfied, or should you only do the other stuff if the guard condition is satisfied? For the sake of argument, please assume that the guard condition is a simple test that returns a boolean, such as checking to see if an element is in a collection, rather than something that might affect the control flow by throwing an exception. Also assume that methods/functions are short enough not to require editor scrolling. // Style 1

I've seen this a lot: $fp = fopen($filepath, "w") or die(); But I can't seem to find any real documentation on this "or" syntax. It's obvious enough what it does, but can I use it anywhere? And must it be followed by die() ? Are there any caveats to using or when you could use something like if (file_exists($filepath)) $fp = fopen($filepath,"r"); else myErrMessage(); I know it seems like a silly question, but I can't find any hard and fast rules for this. Thanks. It's a logical operator and can be used in any logical expression. http://php.net/manual/en/language.operators.logical.php tacone

I have used Postsharp a few years ago to trace program flow during execution without needing to manually add trace statements to the methods. Is there any other new ways to trace execution to to debug output in a similar way? (Preferably a way that doesn't need to instrument the built assemblies. Maybe not possible?) If you only want this ability at debug time, there's Microsoft IntelliTrace that's a part of Visual Studio 2010 Ultimate, and there's Sergey Vlasov's RunTime Flow . The former makes your program run very slow. Haven't tried the latter. Gibraltar uses PostSharp, but provides you