When should we use instanceof and when not

I have gone through various articles ,but i still do not know why instanceof should not used.kindlylet me know your thoughts.

I find a need to use instanceof hints at bad design. It's a sure sign that a big, complex switch-style construct will follow. Most other times I see it used, we should use polymorphism rather than instanceof. See the Strategy pattern. (relevant examples of use)

The only time I find I need to use it is when implementing equals(Object o).

should I use LaTeX and why (not)?

I'm a student, and just finished this last semester. This summer I will be working on a project that will require a lot of documentation and reports, and I'm shivering every time I think of styling in either Word or OpenOffice. I've been wanting to l

When should I use .Count () and .Count in the context of an IEnumerable & lt; T & gt;

I'm aware that .Count() is an extension method in LINQ, and that fundamentally it uses the .Count, so I'm wondering, when should I use Count() and when should I use .Count? Is .Count() predominately better saved for queryable collections that are yet

what happens to the memory that is allocated using malloc () and is not freed using free () in c language?

What happens to the memory which is allocated using malloc() and is not freed using free()? Will it be considered a memory leak?If you continue to allocate memory in a long running program, and never free it even after you are done with it, then yes

When should we use Observer and Observable

An interviewer asked me: What is Observer and Observable and when should we use them? I wasn't aware of these terms, so when I came back to home and I started Googling about Observer and Observable and found some points from different resources: 1) O

When to use $ (this) and is not it slower?

In jQuery we can do like... $('.button').click( function() { $(this).hide(); } ); But we can do like this too, of course: $('.button').click( function() { $('.button').hide(); } ); What're advantages of using this? Isn't that slower? I think the answ

When the Lambda query uses 'Contains' and does not match the condition "The object reference is not set to an instance of an object" error returns

Platform C#, Dot net 4.0 var city0 = DataCache.GetAllCities().Where(c => c.GeoName.Contains("Dubai")).FirstOrDefault(); The Variable Duabi exists in data and this returns city object var city1 = DataCache.GetAllCities().Where(c => c.CityID

Obtaining the original Java class when using instanceof and distribution

First off, for anyone out there who abhors, detests and despises the instanceof operator, I understand your concerns with it, but am stuck using it. That's because I don't have the authority to completely refactor the way another development team set

Why should I use PNG and not JPG?

This question already has an answer here: PNG vs. GIF vs. JPEG vs. SVG - When best to use? 11 answers I'm building an app that uses a lot of images, so it's getting pretty big. I got more than 15mb in PNG images, and if I convert those images to JPG

Grid layout - why should I use it, and should I use a framework like Bootstrap or Foundation?

I had experience with Twitter Bootstrap and Foundation, and I personally think the only thing I want to use is their grid system. Other features are just bloated. So I read about the prospect of a grid layout. All of the articles I found are oriented

Should I use TDD and BDD if my project changes quickly?

I have my own little project I am creating using RoR, I plan it to have small-medium load. With no doubt I started with BDD and TDD (Cucumber and RSpec to be exact, but I am also experienced with TestUnit), I like it but since it's my own project and

Should I use type classes or not?

I have some difficulties to understand when use and when not use typeclass in my code. I mean create my own, and not use already defined typeclasses, of course. By example (very stupid example), should I do: data Cars = Brakes | Wheels | Engine data

Should we use TIdCmdTCPServer and TIdCmdTCPClient together?

I am trying to write a server and a set of clients that talk to the server. The server will maintain the status of different clients and allow them to alert the central server when there is a status change. A specialist client will allow the control

Why Use Sleep and Do not Sleep

I was reading a code of application and something caught my attention. The code was : usleep(6*1000*1000). I understand that they use this format for readability issues. I think that both sleep and usleep use the nanosleep function, so my question is

change the frequency using fft and do not use integers

I know I can change frequency by whole numbers by changing the variable shift but how can I change the frequency using numbers with decimal places like .754 or 1.2345 or 67.456. If I change the variable 'shift' to a non-whole like number like 5.1 I g

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