Observer Design Pattern in Java 

I can say one thing " ur examples are so Realistic easy 2 understand" keep it up Good work bro n Thank you :)

I discovered this channel a few months ago and I'm legit loving it!

I started following your tutorials in 2017. Now i am a full stack java developer...Thank you a lot

You are making life easier for java developers Love from Pakistan :)

All the playlists were really very good and informative. Thanks, Navin for such wonderful content.

Your thinking way is very appreciatable.Thanks to show me this way of logic building.

Thanks Telusko. Your examples are very intuitive and helpful. I am able to learn Observable Design Pattern easily now

Wonderful explanation and the example of the Observer Pattern I have ever seen! You are my favourite Teacher. Thanks.

Par excellence ! Perfect explained. Perfect example. Especially direct programming in the java. Keep on !

I have watched multiple observer design pattern video, I must say this is the best one and more realistic. Keep it going boss..

Easily able to understanding by giving simple examples with clear explainations. Thanks Naveen.

Actually... This is the best video explaining observer pattern I've seen... From yesterday, I've been searching for observer pattern in both python and javascript, didn't find any video that solidified my understanding. I might have watched 5-10 videos (best ones).... I was sceptical at first since this video is in java (I don't know java) but turns out java is not as difficult as its often publicized. I actually understood everything clearly since I know python and JS Naveen's example of RU-vid was on point!!! If he had not taken youtube example, I think it would have been just another observer pattern video Java is also good!!! I'm liking the way it's written Now I'm gonna create this in JS

Its really amazing that....this lengthy process is very easy to understand by you Sir😍😍😍😍

Hi Navin, Your videos and way of teaching are quite energetic. Even boring subjects you can explain with full of energy. Keep up the good work bro. Love and prayers from Pakistan !

Great video code along, this really helped me put the theory into practice. Thank you

Thank you sir. I was looking for visitor pattern video and found this new concept. Thanks a lot

Wow simply explained observer design pattern easily .. thank so

finaly, with your exemple i understand how to implement the observer pattern. you are the best.

Please continue the series. It would be very much helpful.

This is called teaching! Excellent

Quick and nice explanations that's very easy to understand - telusko learnings. From this channel ,I have learnt a lot. Thanks much Navin

I got very good understanding with ur explanation sir.Thank you!!

Hi Navin, I really have to say this. thank you. you surely are changing my life for good. keep up the good work.

Hello Navin, I have been watching your videos for a while now and I find them very useful. I really wish you could do a live stream some time so that we could interact with you.

Yeah I always waiting for your video content .... Everytime

Your example was awesome! Thanks, bro :D

Hi naveen, can you also make videos on Java memory management and how to improve performance of java applications.

Great content! Thank you so much 👍🏻

Thanks a lot 🙏 Expecting more videos like this.

Sir, felt great, to be honest. I was struggling with this observer pattern and now it's all a matter of examples - you've made it that easy. And one more thing, with this online studying times, this study feels much more realistic with your appearance. Otherwise, only a study video makes it boring sometimes. Thanks a lot sir.

Crystal clear, thanks a lot!

Amazing series....can we have more design patterns explained through some more videos under this playlist?

thank you for this awesome explanation!!!!

Just amazing, a smart way to explain things, Thank u soo much

Thanks Naveen . You have explained it very well.

such an easy to understand example! thank you :)

It was awesome to follow all of design pattern videos. Could you cover all the other design patterns as you said we have to know all?

Thank you Naveen for your awesome videos.

Very understandable way , thankyou telusko

thank you so much sir. very clear explanation.

Awesome I can use this concept with JavaScript too. Thanks a lot

Amazing explanation !

I am impressed. Kudos. Explanation, engagement and I do not believe that you are getting enough props for ur work. If you have been my high school or college teacher ... :( , but thank you and will keep supporting sir :) :D :}

Thanks for explaining it in lucid way. Few things I noticed.. Subscriber class .. Channel channel = new Channel (); This is not required... You can remove the RHS part as you are doing in setter method.. Another improvement in RU-vid class is ... Unsubscribe is called only from subscriber side but not from channel side...

Every time...learn new from telusko, and waiting for micro services series

Great explanation thank you so much.

Great Explanation. Good Example.

Hey Telusko, thank you very much for your great videos! I got a simple question, are these patterns static in it's architecture or is it allowed, to change it for special use-cases? I rewrote this pattern by myself just to internalize the idea behind it, but called the method unregisterSubscriber and registerSubscriber from the class channel in the method unSubscribe and subscribe from Subscriber every time a subscription or unsubsctiption from a Subscriber takes place, so that the channel doesn't have to call the method explicitly and only gets informed about the new subscription or unsubscriptions. Also, evey time a new video is being uploaded, I don't call the update-method from subscribers, but send an update method from the channel class to all subscribers. Would that still count as observerpattern or is it strictly required that both sides have to register each other and the update method is in the class of those, who get informed? Keep up the good work, love it!

Superb explanation Thank you Sir...

Still helpful after 4 years❤

thank you very much very simple and easy to understand

well explained🔥Also try to upload the other design patterns as well it will be very useful for us...!!

Hey naveen, is it the same while implementing the code logic for suscriber notification for such a big platform like youtube or some db coding and logics are also required?

Brilliant analogy !!!

I purchased a GFG course about System Design but that is not at all good but this video cleared my doubts.

Thank you so much Telusko

Great work sir...pls make a design pattern series

U rocks always... Student of telusko...

Actually the observer pattern is much more abstract and braod than that. It has to be general. I know that you are trying to make it simple so everyone understands it, but in doing so, you missed the principle of the observer pattern which is to make code flexible and easy to be added to by creating interfaces and classes that implement the interfaces and then under these implementing classes we can have as many subscribers and channels as we want. The way you did it is just normal java code with no design pattern.

Just mind blowing sir!

Well explained. Just one potential correction - upload() is storing video title to channel title.

you have great explanation skills :D

Please continue this series...

Respect, naveen.

Simply super😍🤟Thanks..

Since you are making videos of Design Patterns, can you provide explanations of the various patterns using functional style?

Your explanation is not academic. It's easy to understand! Thank you I'm just seeing your register numbers are 999K. Wow, congratulations! Hope you reach 1M subcribers point!!

Good Explanation..Thank you

Just a random question, I have lot of nested if else statement in my project, how to avoid using nested if else?

Thank u a mil for this amzing video wow

U just earned a subscriber.

Awesome!!!

good explanation. so clear now. small doubt: during unsubscribing, only subscriber is removed from the list of subs in the channel object but not the channel field from the subscriber object. forgot ?

@Telusko @Navin which software do you use to create video. Presentation and you video in it

Amazing explanation

Actually very nice example.....

Thanks, example is matching to observer pattern

great boss!

Thanks for the interesting video. Just wondering, about the subscription method implementation part. Is it correct to keep two diff methods and call them separately? For example, when a subscriber subscribes to some channel, aggregation into the channel's list could be called in that method. Now, you can miss the subsequent subscribeChannel method call for the subscriber, and it will break the logic. I guess, it can be treated as a bug. Isn't it? Thanks

Sir, u r genius !

Superb explanation

It's very realistic example. This is more than enough to understand the pattern. Good Convey....

It should print who is uploading as well and we can use getter for title. The example would be better if there was case without and with observer.

Thanks!

Thank you very much

you are awesome (Y) Keep up the good work (Y)

Thank you brother

Can you please make more python videos, some suggestions can be algorithms and ai, games using pygame, ethical hacking, data analysis and data visualization.

Awesome sir... 🙂

This one is awesome :)

V good clear video

Hey Naveen, I often get confused on how come Subscriber (Observer) get the update() method. And that method contains the "video uploaded" message. I think managing that message should be responsibility of channel (Subject)

Hi Naveen, you are doing superb job. I just have a doubt in this Observer DP. We are calling telusko.subscribe(s1)... methods inside RU-vid class. but if we are already calling s1.subscribeChannel(telusko) then it shouldn't be necessary right?

fantastic explanation xd

Thank you sir

Sir please upload more designpatterns topics

Hi Navin, Can you please upload more design pattern video, If possible can you please give any existing example which Java is used internally.

Your a legend

1:37 - yes Navin. I wait

Nice example