Real life usage of the “sealed” keyword

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C#

Can some one provide a couple of examples of real life usage of the sealed keyword? Thank you.

Posted 27-Oct-10 2:34am

priypavan

Updated 27-Oct-10 4:04am

Nish Nishant

v2

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5 solutions

Solution 4

Sealed class cannot be inherited and any attempts to inherit the sealed class will result in error, you need to do homework on this;

here's a link which explains sealed class

Sealed class explanation

and to make your work easy i have googled it for you

Sealed class real life examples

Don't forget to mark this answer if you find it useful

Thanks and Regards
Radix :rose:

Posted 27-Oct-10 3:16am

radix3

Comments

Dalek Dave 27-Oct-10 10:13am

You let him off too easily!

Solution 5

As Toli has replied already, sealed classes are expected to have a slight performance advantage during JIT. It's not as good a difference as people expect it to be, so that should not be the deciding reason to make a class sealed.

Since a sealed class will not have child classes, the JIT compiler can safely generate call IL instructions instead of callvirt IL instructions when it is sure that the instance on which the call is made is non-null. So even if it's invoking a virtual method, if it knows for certain that the object is non-null, it can emit a call instruction which is faster than a callvirt instruction.

Once again, do not use this as a basis to seal your class. Do that only if you think it's the best choice for your class hierarchy.

Posted 27-Oct-10 4:13am

Nish Nishant

Updated 27-Oct-10 4:22am

v2

Solution 2

Now, I guess it's too much of your homework question here on forum. Please stop flooding the forum with your basic questions, probably a part of your homework assignment. Read, learn, Google...

If you really know what 'sealed' keyword does then you can put many examples by yourself.

Posted 27-Oct-10 3:00am

Sandeep Mewara

Solution 3

1. Speed!
A sealed class is instanciated slightly faster.
2. Block / Annoy!
No one can easily enrich your class.

Posted 27-Oct-10 3:12am

Toli Cuturicu

Comments

Nish Nishant 27-Oct-10 10:05am

This is actually the most accurate reply. Unfortunately, someone downvoted it. I propose this as answer.

RaviRanjanKr 27-Oct-10 10:13am

Agree to Nishant

Toli Cuturicu 27-Oct-10 10:17am

Thanks. It happens sometimes. For example, the OP does not understand the answer, or overlloks it and downvotes.

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Hiren solanki · Accepted Answer · 2010-10-27T02:40:00

Solution 1

Generally in real world enviornment the third party rendors can use .Net dll files and inherit the classes by creating a new software,So in this case to protect the classes declared as a sealed and protected access modifiers,Sealed class is also useful to restrict the hierarchy of inheritance.

Please vote and Accept Answer if it Helped.

Posted 27-Oct-10 2:40am

Hiren solanki

Comments

Prakash Kumar 27 23-Dec-14 0:30am

onion