Learn How to Use Abstract Classes

[@amigoscode]

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[@michelchaghoury9629]

there is a problem with the link it gives an error page

[@flyingrecordofficial]

Mashaallah bro

[@flyingrecordofficial]

you smart work

[@flyingrecordofficial]

@@michelchaghoury9629 Hi

[@andrekreou1]

I've already built the biggest part for my MSc thesis project because of you... Don't know how grateful I am for your contributions, not only for me but also to the developer community.

[@TeslaDo]

You may join the courses?

[@meanstoandend]

I very much appreciate and enjoy your content and the way you teach. I’ve been learning a lot from you and just wanted to say thanks for doing what you do 🙏

[@moathdw910]

It's a fine content but he still always acts religious in a very annoying way, it would be better if he keeps his beliefs to himself and keep it professional

[@meanstoandend]

​@@moathdw910 when you grow up you'll realize a few things. First - just because someone is religious, doesn't mean they're acting religious. You're angry at something that literally isn't referenced or talked about in any of his videos. Just because he wears traditional clothing? Man - people still have a long way to go. Second - even if he did bring his religion into this, it's a good thing to get different perspectives from different people. Don't be so afraid of things that are different from you and maybe one day you'll be able learn all the world is willing to teach you.

[@TeslaDo]

​@@moathdw910 It is authentic way of professionalism. Change your vision, saying hello in Arabic does not make the content religious. I have never heard of anything about "create" action as a religious way. he also says "Voila!" which does not makes him a francophone

[@hitstick567]

Could you do the same video but with interfaces? I feel like they have become more complex with each Java release. You seem to have such a great understanding of it

[@MrBraga776]

Would be great. He already said that programing oriented to interfaces is better and is quite difficult to learn how to use it.

[@TheSpiderWalk]

Amazing, I saw that there are abstract classes but never knew what are they really for. Thank you for sharing

[@snoopie51]

Thanks for going further than the "Animal" "Shape" stuff. I never understood how to "Actually" do it with those examples.

[@dudnik399]

Great example, thanks for breaking it down. Cheers.

[@TkmMusicProduction]

Very very clear explanation!,with real example, yes, thats true, you will never see Dogs, Cats,Squares, rectangles, foo and bar in production!, you will see business procesess like this!.. Thank you very much for your useful video! 👍👍

[@abdedaimehicham2650]

Thank you for your explanation I have one remark about the method parse i think you can imporve it by avoiding boilerplate code and leagcy classes to read file and you can use Files.lines and It will return a stream and you can do filter on this stream and create another method to test the regex and apply this method on filter method .

[@davaa847]

Very good example. Thanks

[@wgalloPT]

i so thankful for everything you do over here!!! ALWAYS amazing. Thank you

[@ravienu9912]

Hi @Amigoscode, I have been following your content for quite long. It's really incredible work you are doing to help all of us. Thank you very much. And I always face challenge in understanding the existing code (mostly I work on Java) when I am moving across new projects. I really appreciate if you can prepare a video on how to understand existing code base of JAVA. Thank you once again.

[@johnronaldraviz4052]

I never thought of using abstract methods declared on an abstract class. Thanks a lot.

[@dansmar_2414]

This is a great explanation, thank you so much!

[@DebugWithAdam]

Of course it makes sense as always. Thank you so much man.

[@patco101]

This is a gem.

[@CityCata]

Im preparing for interviews in January so now Im just browsing youtube reviewing stuff 😄

[@mandanakhashayar9678]

The very clear explanation. Thank you. Even we can have default implementation for method clear in abstract class. That can help us to modify the code much easier when the method is just needed to be implemented by some classes. Thank you so much for your useful videos.

[@cesarhinojosa7679]

I was so annoyed at being taught complex design patters and design principles with squares, circles, apples, bananas, etc. Thank you for this very helpful example!

[@daironperezfrias7819]

Thanks for all your content, from Cuba !!!

[@genprimabiocakti6159]

That non abstract method inside abstract class which call abstract method is make me understand after all. Thank you

[@fipabrate]

Wouldn't it be better to have default implementation of clean function (in this case only return input) in abstract class and then override it in child classes only where you want new functionality?

[@noss403]

It is good idea.

[@hieubui5122]

Thanks you amigoscode

[@zimmtheking]

great example and thanks for not using "cats and dogs"!!! please more of this pragmatic and uselful stuff.

[@anastasiagavrilita6567]

finally: an explanation hitting its target 100% huge youtube, yet so many videos are too "abstract" :D

[@isahbala2540]

Funny, but more interesting than Java classes in College! :)

[@carlkarama]

Since you are producing/exporting reports, you could implement the visitor behavioural pattern on the abstract class and implement a visitor interface that accepts an export feature

[@RajkumarAdhikari]

Watching from Nepal,🇳🇵 lots of love😊

[@fonte1184]

Hello sir. Please someone recommended your channel for me. Please can you show me how to start with jsp from downloading intellij to running a first program. Thanks for reading

[@kamertonaudiophileplayer847]

It is a very good designed video and very helpful for software developers.

[@stevegatspaul]

what is difference between interface and abstract class?

[@fdov4]

Thanks for your content, great quality. Greetings from Mexico my friend :D

[@nedimkulovac6394]

Hey Nelson - great content! Love to see patterns like this explained.

[@natanaelsc]

Thanks bro!

[@adilwise]

Hey, great job brother

[@brioquery]

Nice and concise.

[@rounder1000]

Salam aleykoum amigoscode, hi everybody Can you make a video of what do you think about remote work. What is your experiences, how did you live the COVID time working from home? What are the pros and cons of remote working? Thank you and big up !

[@000124021]

Awesome explanation, thank you!

[@igorsantanas]

Wow, I liked that a lot, thanks! Strong content!

[@wildjoe6259]

thx for real example!

[@alexyspol5221]

Very good! Thank you

[@wagnernoise]

Since I was aware of the factory design pattern (very similar to this) I use it whenever I see it can fit :) Thanks for the great video! Cheers

[@petroniobonavides3530]

Wonderful lesson!!!! Thanks a lot

[@rajendranaik7317]

Sincere request to create a Java playlist where an order of the videos for a complete beginner sir...

[@Mac1355]

hello very nice video about important thread in Java. is good review some principies abou t the way to code better all days. Many thanks

[@autoexec5367]

Brilliant! :)

[@talbiabdelali5914]

Great bro! Thank you

[@caffeinejavacode1475]

as usual, your example is just Hello World *_Can show examples Spring+Abstract class + Generics_* I think it will be more useful Thank you for your effort

[@KangoV]

Only subclass if the phrase "is type of" is true. Also, keep this in your head whenever you are designing..,.. "prefer composition over inheritance" and you'll not go far wrong. Also remember a class should only do ONE thing and do that thing well. As soon as you start mixing concerns, your class becomes needlessly complex and breaks the Single Responsibility Principle.

[@modoulaminceesay9211]

I might learn java, i know c++ , python and javascript

[@mamadoubobodiallo1216]

Very useful video bro 👏🏾. Definitely what I need to improve a project I’ve been working on

[@inoobbeyt1031]

Can make video on method return abstract class ?

[@mikesabiking]

Instead of making the clean() abstract, would it be better to implement it to return unmodified value. That way existing classes don't need to be modified with clean if it's not needed?

[@harrabiyosri1785]

Thanks so helpful

[@christopherabelet4672]

Thanks very interresting. However I do not understant thé diffences wirh the interfaces

[@zzzzzzzzzz2588]

Amazing video. Could you please tell me what theme are you using?

[@treeteqs]

very clean, machallah

[@jesper9334]

Thanks for the great video, what color theme are you using?

[@hoangtuan4592]

Thank you very much

[@sovrinfo]

Thanks!

[@thanhlocnguyen4910]

Nice video ! Can you have a video how to deploy microservices into AWS ?

[@ianneilagasen2842]

Good content as always, Nelson! Just one question, is it better to make the non abstract methods become static on the abstract class? So that we dont need to instantiate an object. Example, instead of new NumberExtractorReport().prepareAndSendReport(path) We could do this: NumberExtractorReport.prepareAndSendReport(path)

[@noss403]

It is not better, but you could do this, if you want.

[@EnchikO]

Why should I use Open JDK instead of Oracle Open JDK when both can be use commercially. Thank you.

[@alimrad7760]

Make a video about design pattern in java, thanks🙏

[@alexeygopro1282]

Is it possible to use interfaces here instead of abstract classes? What are pros and cons? Thank you for video

[@TransitionPhase]

Depends on your situation. If you would use interfaces in this specific example you can not have a common parse() method and you will have to copy the same code in the parse method of every implementation of the interface. And this exceeds the DRY (dont repeat yourself) principle

[@noss403]

@@TransitionPhase Interfaces can have default methods (methods with implementation). Since Java 8.

[@TransitionPhase]

@@noss403 Its true thx for noticing, I forgot that's possible. Then i guess it's the best to use abstract classes in this case cause interfaces are more generic in what they promise to do.

[@milanschacht3920]

What do you think about naming abstract classes like AbstractEmailExractor? I know naming is controversial and sometimes hard. :D

[@pavanrai6196]

Please launch design patterns course on your website

[@sayyedmuaaz]

But what is the difference between polymorphism and abstract classes then? Are they serving the same goal?

[@francksgenlecroyant]

Hats-Off 🙌🙌🙌

[@thapelomorare1484]

Do Servlets and jsp

[@EdwardNorthwind]

No. You needed to override the parent method in the EmailExtractorReport class and wrap the parent method in your new clean method. You yourself say that classes should be open for extension but closed for modification.

[@sadiulhakim7814]

Where should i use final class?

[@MudassirKhan-sx9jy]

Wa alaikum Salam.

[@terabhai4955]

please make video on tomcat!

[@trungthanh4134]

what font do u use in this video

[@nikhiljose2029]

Is regex testing available in intellij community?

[@FahadAli-km3ll]

As-salamu 'alaykum bro. Can you do a video on CI/CD? :)

[@Danish_Khan_]

Please please, guid me which tech skill i should learn so I land a job in halal compony. There are so many haram stuff in software development and many tech industry. Please please guid me. ❤️🙂

[@brimabah2163]

I would like to join your boot camp

[@aayush5474]

when to abstract class and when to use interface?

[@travelers4178]

First comment ☺️ Assalamu aleykum my brother 👍 good video! We need to refresh our memory all the time.

[@traviswhitten6452]

Why make the PATTERN static?

[@TeslaDo]

Abscract / abstract? Is it only a typo or a slang?

[@94JulianDavid]

Why don't use interfaces ?

[@raulrahaman9863]

I don’t understand anything after the reading of the files part :(

[@TheStrategist314]

how come when I click the discord, it doesn't work?

[@rabbyhossain9537]

How much salary give your company for you

[@noss403]

Wouldn't it be better to write code like this: (in parse method) if(!scanner.hasNext()) { return "Empty file"; } scanner.nextLine(); ....

[@bakre_dev8728]

[@USONOFAV]

what's the difference between Abstract classes and Interface with default methods. Anyone? You can have common functionality on both abstract class and interface.

[@mychellmotta6639]

You can't implement methods on interfaces, so in his example, he would have duplicate code on both NumberExtractor and NumberExtractor with the parse method.

[@94JulianDavid]

@@mychellmotta6639 Since java 8 you can have default methods in interfaces

[@erickshaffer6615]

Says he won't do the typical animal example. Proceeds to do exactly that

[@pancake4691]

fr lol

[@jeseviso-s2u]

Los Pollos Amigos

[@blockbuster_7103]

Use kotlin

[@flyingrecordofficial]

Mashaallah bro

[@ЕвгенийКозлов-у4л]

whos deliting my comments?

[@MuslimMan377]

Him : salam alaikom Me : subscribe, like

[@beshbenesh1796]

yes no more cats ands dogs..... :)

[@redhotbits]

just dont use them

[@valarchandran6581]

@amigoscode nice explanation

[@abdullahdaoud]

Thank you so match , this is very great 🤍