Basics of LLD | UML Diagram in detail | Association Vs Aggregation Vs Composition | VERY imp!!

If you are a beginner in LLD or just a beginner in software development, trust me these concepts will help you a lot!
If you like my work, Please 𝐬𝐮𝐛𝐬𝐜𝐫𝐢𝐛𝐞 here - / keertipurswani
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#lowleveldesign #objectorientedprogramming #softwaredeveloper

[@manideepamara2263]

Bulb has a filament --> composition House has a bulb --> aggregation

[@KeertiPurswani]

Nice! Keep going!!❤️

[@ayushman_sr]

dimag batti jala di

[@KrishNamaste]

Dear Keerti, I just watched this video on LLD and UML, and I'm absolutely blown away! It was truly amazing! I must say your ability to simplify complex concepts and explain them with such clarity is impressive. Thanks to your captivating presentation style and visually appealing content, I was completely engaged from start to finish. Your enthusiasm is contagious, making the learning experience enjoyable and inspiring! Love you!

[@aryatech7275]

Request :: Make a playlist of lld for a beginner from scratch. For a student who doesn't know anything about LLD so pls structure the playlist so that we can follow that one specific playlist bcz searching for LLD on KZbin makes it very confusing cz there is no such specific dedicated playlist from scratch to interview ready

[@stejinstephen9591]

+1

[@KeertiPurswani]

That’s precisely what I am doing. Creating whole series with code, will cover a bunch of questions. If you follow this series properly, you will be an expert in LLD!

[@akshayp.y.5286]

That was crystal clear. I did't have to put in lot of effort to understand this. Thanks for this Video

[@LearnwithChampzz-rv4lk]

Very nice tutorial, I was invested in it fully.

[@akhilsharma1778]

Although nobody asked, but these tutorial videos on LLD are informative and helpful. You are putting so much effort into these videos, it is fine if you put paid promotions in the videos. You are already teaching for free and if someone doesn't want to see the ads then they can skip it.

[@yogeshdharya3857]

Have heard of these composition , aggregation , etc terms countless number of times . I just want to get rid of them today !

[@gangar2728]

This is such an awesome refresher of the key concepts, you make it so crisp and clear! Keeps one glued till the end. You're a natural teacher! Thanks so much for such great content, Keerti!🎉

[@raemenon6360]

Thank you so much for explaining this in such an easy manner. This was much better than 1 hour of college lecture.

[@ajayreddy9219]

i have started going through your videos and the amount of effort you put into these videos is remarkable and we're glad we have creators like you.

[@VISHALSHARMA-ps4jm]

great job Keerti ... Beautifully explained

[@subrintakarmakar5436]

Thanks for this video it clarifies a lot

[@_ipublic]

Very much beneficial❤🎉

[@deltadelta666]

I laughed my ass off when you gave the example for aggregation "if the person is destroyed" the house will exist 😆. Great explanation btw, you are better than most proffesors out there.

[@Joker-cw5hp]

cool very smart explanation , till best i have seen to start with lld

[@Indian-fv8kl]

really really very informative video mam, i just 28 min u have covered a whole looot. Thank u so sooo much mam. You are teaching this topics far better than my professor. Love from Germany❤

[@AnishS-cp]

wow this was amazing!!

[@LearnwithChampzz-rv4lk]

I think "Car has a tire" should be a Composite Relation Ship. Because, without tires car is not completed Just like BODY and EYE analogy. "Showroom has a car" sounds good for Aggregation, because without that one car, it is going to still be a showroom. I am seeing it this way, The one whole structure and its element in it has Composite relationship. (Mobile Phone has IC boards, Laptop has Display) The two different entities but still linked somehow is Aggregation relationship. (Mobile Phone has screen guard, Laptop has Monitor)

[@shatmanyugupta]

keerti purswani has a yt channel --> Aggregation yt has a keerti purswani channel --> Composition

[@prakharkhandelwal9865]

awesome video, literally complex concepts are explained with such great analogies and examples. Kudos

[@AAKSHAS]

16:05 She is from Bhopal in Black dress, for those who are also residents of Bhopal. Here she explains about Aggregation vs Composition

[@manishkumar-zz6fh]

thankyou didi. you made the concepts very clear

[@YogaJournalWithMimansa]

Thanks Keerti for the amazing explanation! :)

[@codecspy3479]

Maam while explaining association , you have told that both the classes can call each other. Can you say exactly what do you mean when you say "both the classes can call each other" . I know that one function can call another function. But what how classes call each other ??

[@jayandrapatil]

Beautiful explanation.. Keep up the good job.

[@md-ayaz]

Thank you Keerti

[@SumitGupta-wr3jf]

Now the confusing part, the example you gave body and eye...Suppose Eye is removed from a person still eye can be used to other and person has house both can be considered as unrelated class that can be association

[@AkashVerma-l7y]

Great Efforts .. Thanks👌

[@abhaymishra8112]

V.Good points mentioned to differentiate Aggregation and Composition.

[@CaptainCoder1]

Wall watch has hands(sec, min, hour) ==> Composition Table has four legs ===> Composition A shoe has lace ==> Aggregation A room has Door ==> Aggregation

[@simransahni4656]

Really admire your hardwork and honesty Keerti Have been following you from a long time I am glad i saw the notification of this video earlier. Now there is a very high chance that you will read my comment! 😂 Definitely gonna watch and learn from this. Thank you for putting in so much effort and giving back to the community. You are a true inspiration to all the women in tech. Best wishes! ❤ PS: this video comes at the perfect time when i was looking to deep dive into this topic This will also help new developers like me.

[@KeertiPurswani]

Thank you so so much Simran! Your comment made my day! 🤍🤍 many more videos coming up. Hope you like them 😇😇

[@vinamrasangal8436]

@@KeertiPurswani Keerti Purswani

[@nisargbhagwat2039]

The last explanation was amazing. Like if a object is used in different classes. Then it is obvious that it is aggregation. Because like if it destroyed in one class then what about other class, they are using the same object. So there will be sort of inconsistency. On other hand if One class is handling the total life cycle of another object then It is Composition. Please if something I have understood wrong, please correct me then. Thank you very much in advance.

[@himanimishra3932]

Great video. I just loved it. You make it so easy to understand!!!

[@kapilchoudhary2922]

Thanks for explaining these fundamentals clearly. 💯

[@realbest6528]

very nice explanations

[@KeertiPurswani]

Thank you! Hope you subscribed and shared with your friends! ❤️😇

[@realbest6528]

I'd suggest do 1 thing for 3 months, best of the content. Not caring about subscriber count/ likes !! And come back to it again, You'll be amazed Anyways you're awesome 😎 thankyou 🙏

[@shreyasrivasatava7152]

Nice i am loving your video tutorial.

[@rex.kishore]

Well cooked explanation... Loves your's energy, attitude and euphoria when your teaching and It makes me listen in a happy way...💕💕💕

[@grid47]

The music you kept at end is funny!:)

[@yashkaushal761]

It's amazing

[@shankarbinnar2332]

Thanks.. this is the new topic i learned today !! Very simple and clear explanation 👍👍

[@nagasatishkrishnareddynall2089]

Such a nice refresher. Ended up using this as ref when I was asked to work on new system at work. Keep going 💪 Keerti!

[@yt_se_yt]

Two entities may have both composition/aggregation and inheritance behavior . eg :- Bird is-a flyable animal OR Bird has-a fly behavior . How do we decide which one to chose ?

[@charan775]

flyable animal is not same as fly behaviour and any fly behaviour can be kept in flyable animal class only

[@yt_se_yt]

@@charan775 I got you ..

[@yt_se_yt]

@@charan775 thabks

[@jasleenkaursaroa]

Very well explained !

[@rajarayavarapu2167]

A has an instance of B means class A has a member variable of type B in a similar way what do you means A uses B or B uses A.Thanks in advance and thanku for making us grow and learn.

[@umdoidoai7921]

Great Videos, thanks !

[@AAKSHAS]

24:37 IS-A relationship for INHERITANCE

[@soumyasatish7941]

At 26:55 'A' uses 'B' relationship should have a dotted line with an arrow instead of a triangle right? Because the triangle is for implements as is shown on the right

[@mohithkankanala8336]

could you explain what the uses relationship is?

[@akhilesh59]

Very Helpful. Thanks a lot :)

[@nikhilagrawal9217]

Thank you for this video.

[@shubamgoswami]

Binge watched the whole video 😂 I am going in love with software engineering 💗

[@KeertiPurswani]

Yaaaaaaay! That’s the best comment a teacher can get! ❤️😇

[@AAKSHAS]

12:47 Should that be written as * .. * or as 0 .. * or as 1 .. * ?

[@tahmad86]

Hi Keerti, I just stumbled onto your channel and I must say I am thoroughly impressed by the quality of your contents. Awesome awesome job. Long time hardware engineer and trying to expand my sw development knowledge. Looking forward to watching all of your contents on sw development. Best of luck!!

[@InfinteMotivation]

nice work didi :) , wish you best of luck

[@dheerajkumar824]

Person has a flight --- aggregation Flight has a seat --- composition

[@prithvirajan105]

Thank you..

[@bhargavinaik8145]

I have a doubt, the Customer can have Orders, we can say Customer Have Orders, the relationship is composite as Order cant exist without customer. So we can say Customer is like parent for order, but the order class can have customerId so now does that mean order has customer?

[@SahithiMangalapalli]

Thank you for the video, it very helpful :)

[@matheens6689]

Hi,can you make a video about logger design app in LLd and which design pattern is perfect? .really appreciate if you assist me

[@AAKSHAS]

2:22 UML CD

[@NeverGiveUp_oo7]

Excellent 👍

[@AAKSHAS]

8:12 RBC

[@sureshmajji9629]

Thank you very helpful

[@suneel8715]

please make tutorial on microservices design patterns

[@yusufsaifi3108]

Thanks such a valuable content.

[@KeertiPurswani]

Thank you for showing up! Please do share the videos with your friends! ❤️😇

[@coder7078]

What do you mean by A uses interface B ?

[@AAKSHAS]

26:00 Coming or Not coming --- Question

[@sujeetbadnale9441]

Thanks for the videos(not just this one all of your videos). Especially the examples that you gave were from real life and made sense. The video was clear and concise. I had just one about the hint that you gave which helps us decide between composition and aggregation, multiple instances of a class. So is it in simple terms if I have singleton class then it can't be a composition, did I get it right ?

[@divyareddy7622]

keertiii when you give any mock questions... can you please code them in c++ as well please ❤ thank you for existing and your hardwork ❤❤❤

[@ankitadewari9071]

Bro! you are amazing.

[@yt_se_yt]

There are some cases which are confusing . Eg :- In Splitwise Design How do we decide if User has-a Expense OR Expense has-a User ? This drives the whole flow . Similiar in Order Management System User has a Order vs Order has a User ? If anyone is clear on this please reply.

[@yt_se_yt]

Or Am I confusing this with Association ?

[@sushmareddy1370]

phone has operation system -> composition phone has sim card -> aggregation

[@shankysays]

Uses, is a , has a agg, has a comp

[@sricharan4772]

Hey Keerti Nice content I have a doubt... At the end of video, when u were explaining about interfaces with Association relationship, A uses B where both A and B are interfaces Then the representation should be like A - - - - -> B Isn't it? U used a triangular arrow insteaad of ">" symbol Please clarify on this

[@AAKSHAS]

23:13 Quick recap

[@InfinteMotivation]

Desktop has a monitor --> aggregation Car has an engine --> aggregation?

[@datta3268]

I am confused, would you please mind clarifying the below relationships? Car & Tyre => Aggregation same way, If a Car has a Camera, then I can say, Car & Camera => Aggregation And we know that Car & Camera is analogous to Body & Eye. If so, why Car & Camera is Aggregation but Body & Eye is Composition ? 😵‍💫

[@tresorone-e5s]

very useful

[@cricketguru7596]

Thank you so much for amazing content always

[@KeertiPurswani]

Thank you for showing up! Please do share the content with your friends! ❤️😇

[@subrintakarmakar5436]

I think there is a mistake at the end A uses interface B. I may be wrong. !! Please clarify I am not able to understand the difference between A implement B and A uses interface B from the diagram time : 27.04 . I think it should be like A ....> B. Is not it.

[@kumarsamaksha7207]

7:10 List of body parts returned.

[@quadsoft7376]

Mind blown

[@dheerajkumar824]

One weird thing that i noticed is that views count of stretegy video is more than that of actual implemented video. People are coming just to see how to crack interview

[@shreyatiwari8239]

thanks maam

[@AkshaySharma-bg3oj]

1 sec earlier Mother has baby (Composition) baby is child of Mother (Inheritence) I was explaining this to my mom. Now I transitioned into Composition. Watching this from belly

[@AAKSHAS]

I watched this video at 0.4x speed to catch up with speed or rate of delivery of spoken words.

[@divyareddy7622]

thank uuuuuuu ❤❤

[@KeertiPurswani]

❤️❤️❤️❤️❤️

[@tresorone-e5s]

whats a great video

[@07bic010]

keep doing, you mean a lot to us !!!

[@mohamedBenthami-f4c]

great

[@tanujarora4906]

Please make a whole playlist on LLD, they expect us to be experts in lld even with an year of experience😢

[@KeertiPurswani]

There’s already a playlist and the number of videos are increasing with time.

[@AAKSHAS]

Voice echo present in recording which can be corrected by professional for just Rs 10k.

[@abrahamphilip302]

Or use free plugin

[@kECAnuragPal]

no i havent thought static

[@nishantgarg2815]

19:02 that was dark

[@SwikarP]

I would say reduced or stop eating sugar and carbs in your diet. Burn as much calorie for next 4 weeks. You will look slim & fit again.

[@daggupativishal7078]

Crazy

[@aamirali6976]

Mai uske siwa mar jaoga : Composition Masala nahi koi dusri dekh luga: Aggregation

[@explore7792]

Husband --------- Wife (Aggre) Person ------- Aadhaar card (comp) 😂

[@skalearners]

Dependency 😢

[@lifeofasoftwareengg...930]

Please get a better 🎤 😊

[@zafraan3038]

Kaam dekh tera. Theek hi he.

[@saukatali5745]

i love u

[@adarshjha5126]

tum log to sabko love hi karne lag jaate ho ...padh bhi le