Casting an Object (Upcasting and Downcasting) - Java Tutorial

[@BillBarnum]

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[@jbayg]

OH MY GOODNESS THIS IS THE CLEAREST EXPLANATION OF UPCASTING THANK YOU

[@chandan07talreja]

Awesome man. A visual representation always helps in better understanding. Keep posting more videos.

[@raxkhmanLite]

Indeed, this video is one of the best explanation on casting of objects out there!!!

[@BillBarnum]

Thanks for the feedback. I'm glad you liked the video!

[@bennails3447]

Legendary video on the subject. The best've I found on KZbin so far!

[@BillBarnum]

Wow, thanks!

[@sp_aryan6]

from India, watching it the night before exam. thanks a lot for making a short easy to understand video.

[@BillBarnum]

Good luck on your exam!

[@unityorder]

After one day trying to understand Casting and finally just 5 minutes explained very clearly to be ok ! thanks !!!

[@BillBarnum]

Thanks for the feedback Amine. I'm glad you like the video.

[@CindyMcGuirk]

Exactly what I needed to know at this moment. Thanks, Bill!

[@HungryBirdStephenHaokip]

Thank you bill been stuck here for a long time now... downcasting is clear

[@_mantis]

I am really thankful for this tutorial. Keep up the good work!

[@BillBarnum]

Thanks for the feedback! I'm glad that you found it useful.

[@zackaoz1034]

I love you Bill, finally a full tutorial with all possible examples.

[@hiteshchalise3988]

really informative, and perfect explanation, thanks bill.

[@HighOctaneNews570]

Finally someone who explains correctly this topic. Thank you Sir.

[@BillBarnum]

Thanks for watching and commenting, Alejandro.

[@prabhatdahal3416]

Really helpful video man💯💯💯. keep uploading more videos . Thank you so much Bill ❤❤

[@abdulaziz_xi]

Thanks man … Great explanation

[@Astrovic1]

it is midnight and will be writing an important exam at 8am :D after this video i finally got the object casting thank you haha :D

[@BillBarnum]

Good luck on your exam!

[@robertastutlys8641]

Exactly what i needed. Thanks for this great content!

[@abdur1996]

Was looking for C# but this was very relavent regardless. I really really like the stack and heap insights in the tutorial as it helps understand whats *really* going on

[@BillBarnum]

Thanks for the feedback!

[@SoftwareTestSolutions]

That is a great explanation... Thanks for the video!

[@obit6380]

Thanks for the video! Very clear and to the point presentation!

[@BillBarnum]

Thanks for the feedback, OBIT.

[@anastasijad4830]

Thank you sir! God bless you

[@ayoubanbara1685]

thanks you from morocco

[@rho8931]

Thank you so much for this awesome tutorial!

[@BillBarnum]

Glad it was helpful, Rhoad!

[@criquetteable]

really good! perfect explanation thanks a lot

[@joaovalerio8137]

Brilliant explanation!

[@BillBarnum]

Thanks for watching and commenting, João!

[@louishou781]

this video is awesome - thank you so much

[@نفرال-فيرزاتشي]

you're the best, keep it up

[@s2k_love492]

Excellent, helped a lot. Thank you!

[@serhatgundem]

Thanks a looooooot. You are great.

[@BillBarnum]

Thanks for the feedback Serhat. I'm had you liked the video!

[@18DZ]

Exactly what I needed before my exam!

[@NikitaSafronov-y6i]

OMGGGG!!! You are a genius!!! It's awesome =)

[@BillBarnum]

Thanks for watching and commenting!

[@kbuvanesh5347]

Very good explaination sir love ❤️ from India 🇮🇳

[@rajdhar1235]

Amazing explanation. Thank you.

[@ИльяХимченко-н2и]

Thanks a lot!

[@AyumiNoran]

Thank you!

[@BillBarnum]

Thanks for the feedback. I'm glad you found it helpful.

[@zhenyuanhe6071]

Thanks a lot! Clear enough:)

[@funnybunny3188]

Very good explanation i got my points

[@BillBarnum]

Thanks for watching and commenting.

[@rafaybbx]

amazing explanation

[@BillBarnum]

Glad you liked it

[@johncerpa3782]

Great video

[@camnooten110]

Thank you, this really helps

[@IluSsIoNnN]

Thank you my good sir !!!!

[@BillBarnum]

Thanks for the comment, IluSsIoNnN.

[@NikitaSafronov-y6i]

01:10 does not Lion class inherit controlTemp() as well? If we talk about general inheritance as it is. So, in total Lion method has access to next method (via inheritance) eat() - from Animal sleep() - from Animal controlTemp() - from mammal and one own unique method roar() ear() @overridden

[@jackwesh2976]

Loved it Thanks Much

[@BillBarnum]

Thanks for the feedback!

[@langstonhodges5863]

Do these same concepts hold true with the fields for the classes when upcasting and downcasting? This video only covers the interactions with methods.

[@BillBarnum]

Yes, it would work the same way with fields.

[@langstonhodges5863]

Bill Barnum Thank you very much it all makes since now.

[@yalakaturi.saidivya9158]

Mutilple times of casting,by using single object is possible or not?

[@BillBarnum]

Yes. When you cast an object, you aren't changing any data. You are just "making promises" to the compiler that it is pointing at an object of the type you are casting it as.

[@younesred112]

Thank you so much !! awesome explanition

[@lazry1773]

great video

[@BillBarnum]

Thanks for watching and commenting, Lazry!

[@ginopaolettigeuna1946]

excellent!

[@BillBarnum]

Thanks for the feedback Gino.

[@real_hello_kitty]

Thanks.👍

[@kakashi99908]

So what are the limitations of doing: Lion jen = new Lion()?

[@BillBarnum]

I recommend my video on Polymorphism. I think it will answer your question: kzbin.info/www/bejne/mYbLZIRvoZiEY5I

[@kakashi99908]

​@@BillBarnum I watched it but am still a little confused. In the classes Lion extends mammal, mammal extends animal so wouldn't Lion jen = new Lion() work without having to type cast any methods? Basically I am confused when you use Animal jen in place of Lion jen because they seem to do the same thing.

[@BillBarnum]

​@@kakashi99908 Let's take two variables: Animal alex = new Lion(); Lion jen = new Lion(); The methods available to alex are only those that are declared in Animal. So we could do alex.eat() and alex.sleep(), but we couldn't do alex.roar(), because the alex variable is an Animal and there is no roar() in the Animal class. On the other hand, the jen variable is declared as a Lion. Lion classes have the roar() method, so we COULD do jen.roar() The variable type determines what methods are available. The object type determines what version of the method is run.

[@ramzirebai3661]

Thank you so much

[@BillBarnum]

Thanks for watching and commenting Ramzi!

[@jamesbakis6330]

What a fucking amazing description lol

[@wasimpatel2618]

i cant hear the sentence at 4:02. can anybody tell me pls.

[@BillBarnum]

"This is legal because we are assuring the compiler that Jen is, in fact, pointing at a Lion type object. "

[@wasimpatel2618]

@@BillBarnum thank you so much sir for explaining, I misheard is, in fact to "isn't fact ".

[@spencerrobles9373]

Good video

[@jangul8230]

v.good sir

[@sweeren3619]

ty so much

[@moses.muchemi]

Lifesaver

[@asitkumarsahu5211]

How to cast string to user defined object type

[@BillBarnum]

Here are a couple of examples: Object x = new String("test 123"); //upcasting example String y = (String)x; //downcasting example

[@ash2521]

very descriptive

[@BillBarnum]

Thanks for watching and the comment, Aashish!

[@Aloksheoran]

Good for mugging up only

[@simongadd8545]

Explained an hour of university lecture content in just under 6 minutes and so much better. Maybe I should pay you instead?

[@BillBarnum]

Thanks for the comment, Simon. I'm glad you thought it was a useful video!

[@Subhash_VCU]

Animal jen = new lion() Jen. Controltemp() , a valid statement??

[@jsonwann8908]

thanks...

[@maharun0]

I have a serious confusion. Here it is: Animal

[@BillBarnum]

You can't override the sleep() function in the Animal class because that's where it originates. You can override sleep in a subclass that would otherwise inherit sleep() Does that answer your question?

[@adriansalabanzi2250]

cool.

[@adityakuricheti6653]

lion l = new lion(); This is valid So will it come under downcasting?

[@BillBarnum]

Good question. In that case, the variable and object type are the same, so it isn't casting.

[@adityakuricheti6653]

@@BillBarnum ok thanks

[@khorLDW]

poor joe

[@BillBarnum]

That's what happens when you don't follow the rules of Java. 🙂

[@xrealmob_1037]

tx G

[@barshabhattacharjee6788]

For more visit: kzbin.info/www/bejne/rZPViKOqYpKWndk

[@NikitaSafronov-y6i]

+

[@mehmetali627]

Good job bro

[@BillBarnum]

Thanks

[@mehmetali627]

@@BillBarnum you are welcome sir. You've saved my life in college.

[@nodararonia1554]

Thank you!!

[@Xtcent]

Great video

[@BillBarnum]

Thanks for checking out the video!

[@Carlitos_SH]

THANK YOU !

[@anantshukla6395]

Awesome video

[@BillBarnum]

Thanks for watching and commenting, Anant!

[@mahaaftab755]

great. thanks!

[@BillBarnum]

Thanks for commenting, Maha!