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• C++: ptr->hello(); /* VERSUS */ (*ptr).hello();

  - by Joey

  i was learning about c++ pointers... so the "-" operator seemed strange to me... instead of ptr-hello(); one could write (*ptr).hello(); because it also seems to work, so i thought the former is just a more convenient way is that the case or is there any difference?

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• Why NullPointerException is a runtime exception and RemoteException not?

  - by Tom Brito

  A possible reason because a NullPointerException is a runtime exception is because every method can throw it, so every method would need to have a "throws NullPointerException", and would be ugly. But this happens with RemoteException. And a possible reason because RemoteException is not a runtime exception, is to tell it client to treat the exception. But every method in a remote environment need throws it, so there is no difference of throwing NullPointerException. Speculations? Was I clear?

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• C: performance of assignments, binary operations, et cetera...

  - by Shinka

  I've heard many things about performance in C; casting is slow compared to normal assignments, functional call is slow, binary operation are much faster than normal operations, et cetera... I'm sure some of those things are specific to the architecture, and compiler optimization might make a huge difference, but I would like to see a chart to get a general idea what I should do and what I should avoid to write high-performance programs. Is there such a chart (or a website, a book, anything) ?

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• VB.NET Function Return

  - by waves

  In order to return a value from a VB.NET function one can assign a value to the "Functions Name" or use "return value." I sometimes see these inter-mixed in the same function. Personally, I prefer the return. My question is, what is the internal difference, if any, between the two?

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• diffing two databases

  - by flybywire

  Is there a tool to find the difference between two databases. Both the schema and the actual data are pretty much the same, but not 100%. Do you know a tool that can help to succinctly describe the changes.

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• Java String object creation

  - by Ajay

  Hi, 1) What is difference in thers two statements: String s1 = "abc"; and String s1 = new String("abc") 2) as i am not using new in first statement, how string object will be created Thanks

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• sharepoit performance counter instance name with [ACL]

  - by intangible02

  Select a Sharepoint performance counter object, there are two instances for each of my web site. For example, for the ssp site, the two instance are named as portnumber_ssp_admin portnumber_ssp_admin[ACL] What is the difference between the two instances? What is the meaning of [ACL]?

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• rvalues and temporary objects in the FCD

  - by FredOverflow

  It took me quite some time to understand the difference between an rvalue and a temporary object. But now the final committee draft states on page 75: An rvalue [...] is an xvalue, a temporary object or subobject thereof, or a value that is not associated with an object. I can't believe my eyes. This must be an error, right?

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• Are class methods convenience methods i.e. part of the framework

  - by user333639

  Are class methods convenience methods i.e. part of the framework e.g. +(id)alloc and instance methods are those that were implemented by the developer? I can't seem to understand the difference between instance methods and class methods.

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• how do i Raw url ENCODING/ DECODING in javascript and ruby to get the same answers in both?

  - by Mo

  Hi i am working on a web application where i have to encode and decode a string at the JavaScript side and ruby backend of the code. the only problem is that the escape methods for JavaScript and ruby have a small difference. in java script the " " is treated as "%20" but in ruby the " "(space) is encoded to "+". any way to work around this? another ruby method to encode a string in RAW url encode? thank you

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• INNER JOIN keywords | with and without using them

  - by cedar715

  SELECT * FROM TableA INNER JOIN TableB ON TableA.name = TableB.name SELECT * FROM TableA, TableB where TableA.name = TableB.name Which is the preferred way and why? Will there be any performance difference when keywords like JOIN is used? Thanks

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• LinkedList.contains execution speed

  - by Le_Coeur

  Why Methode LinkedList.contains() runs quickly than such implementation: for (String s : list) if (s.equals(element)) return true; return false; I don't see great difference between this to implementations(i consider that search objects aren't nulls), same iterator and equals operation

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• storing numbers as varchar

  - by Yeti

  Is it ok to store numbers as varchar? What's the difference between int 123456789012 and varchar 123456789012 ?

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• What is the differences and relationships between "process", "threads", "task" and "jobs" in Linux?

  - by TK

  I'm fairly confused with some of the terms used in Linux when I learn about web backend programming. What is the difference and relationships between "process", "threads", "task" and "jobs" in Linux?

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• In Java, when should I use an abstract method in an interface?

  - by John Oxley

  I have the following interface in Java public interface IFoo { public abstract void foo(); public void bar(); } What is the difference between foo() and bar()? When should I use abstract? Both seem to accomplish what I want unless I'm missing something subtle? Update Duplicate of Why would one declare a Java interface method as abstract?

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• Generics : List<? extends Animal> is same as List<Animal>?

  - by peakit

  Hi, I am just trying to understand the extends keyword in Java Generics. List<? extends Animal> means we can stuff any object in the List which IS A Animal then won't the following also mean the same thing: List<Animal> Can someone help me know the difference between the above two? To me extends just sound redundant here. Thanks!

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• How can I see a specific page's memory consumption of a browser ?

  - by burak ozdogan

  Hi, What way or which profiler tool I should use to see a specific web page's memory consumption? Does it make a difference if it belongs to a TAB in an individual browser window? Thanks

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• What about buffering FileInputStream?

  - by Pregzt

  I have a piece of code that reads hell of a lot (hundreds of thousand) of relatively small files (couple of KB) from the local file system in a loop. For each file there is a java.io.FileInputStream created to read the content. The process its very slow and take ages. Do you think that wrapping the FIS into java.io.BufferedInputStream would make a significant difference?

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• Assembly Versioning in .NET

  - by pm_2

  In the Visual Studio 2008 IDE, the properties page allows you to access the version. However, for executables, there appears to be two versions: Under the Publish tab, there is a publish version with a flag to auto increment. Under the Applications Tab (Assembly Info...) there is an assembly and file version - this appears to change the AssemblyInfo.cs file. My question is, what is the difference between the two versions and what are the implications of setting each?

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• Why can one null return be tested but another throws an exception?

  - by mickey

  I want to test if an xml attribute is present. Given this: XmlAttributeCollection PG_attrColl = SomeNodeorAnother.Attributes; This first test works: if (null != PG_attrColl["SomeAttribute"]) "GetNamedItem" is supposed to return null, but the following test throws an exception complaining about the null it returns. if (null != PG_attrColl.GetNamedItem("SomeAttribute").Value;) Why the difference? Just curious.

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• How important is it to unset variables in PHP?

  - by dd0x

  I am somewhat new to PHP and I am wondering: How important is it to unset variables in PHP? I know in languages like C we free the allocated memory to prevent leaks, etc. By using unset on variables when I am done with them, will this significantly increase performance of my applications? Also is there a benchmark anywhere that compares difference between using unset and not using unset?

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• Is there any point in TortoiseSVN diff highlighting last lines of both files as changed?

  - by sharptooth

  In TortoiseSVN 1.5.1 I've noticed a curious pattern. If I change one line in a versioned file and then view difference the diff will highlight not only the changed line but also the last line of the file (though the last line hasn't changed and the colors in the highlight display that correctly). Is there any use of this curious highlighting of the last line?

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• What is MVC and what are the advantages of it?

  - by Teifion

  I found What are mvp and mvc and what is the difference but it didn't really answer this question. I've recently started using MVC because it's part of the framework that myself and my work-partner are going to use. We chose it because it looked easy and separated process from display, are there advantages besides this that we don't know about and could be missing out on? Pros Display and Processing are seperated Cons None so far

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• Is XMLDocument.Save an atomic operation?

  - by JC

  Is there anyway another process monitoring for files created using XMLDocument.Save() could encounter a partial file? Does it make any difference if Save() is overwriting an existing file?

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• Behavior of virtual function in C++

  - by Summer_More_More_Tea

  Hi everyone: I have a question, here are two class below: class Base{ public: virtual void toString(); // generic implementation } class Derive : public Base{ public: ( virtual ) void toString(); // specific implementation } The question is: If I wanna subclass of class Derive perform polymophism using a pointer of type Base, is keyword virtual in the bracket necessary? If the answer is no, what's the difference between member function toString of class Derive with and without virtual?

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