Basics of LLD | UML Diagram in detail | Association Vs Aggregation Vs Composition | VERY imp!!
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- เผยแพร่เมื่อ 19 ม.ค. 2025
- 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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𝐓𝐰𝐢𝐭𝐭𝐞𝐫 - Ke...
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#lowleveldesign #objectorientedprogramming #softwaredeveloper
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!
Bulb has a filament --> composition
House has a bulb --> aggregation
Nice! Keep going!!❤️
dimag batti jala di
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 TH-cam makes it very confusing cz there is no such specific dedicated playlist from scratch to interview ready
+1
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!
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!🎉
That was crystal clear. I did't have to put in lot of effort to understand this. Thanks for this Video
for Aggregration example: laptop has an instance of table (laptop can be carried portable as well as viewed at the System table), for composition: Car has an instance of engine (car depends on engine to start or move)
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.
love your videos they are very simple to understand the core concepts
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.
Aggregation and association seem quite similar. Aggregation cases seem to be a subset of association cases. For example, Person -has a-> house can also be infered as Person -uses a-> house.
What do you think @Keerti?
Thank you so much for explaining this in such an easy manner. This was much better than 1 hour of college lecture.
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❤
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.
Thank you so so much Simran! Your comment made my day! 🤍🤍 many more videos coming up. Hope you like them 😇😇
@@KeertiPurswani
Keerti Purswani
awesome video, literally complex concepts are explained with such great analogies and examples. Kudos
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!!
Such a nice refresher. Ended up using this as ref when I was asked to work on new system at work. Keep going 💪 Keerti!
Well cooked explanation... Loves your's energy, attitude and euphoria when your teaching and It makes me listen in a happy way...💕💕💕
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.
Very nice tutorial, I was invested in it fully.
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 ??
12:47 Should that be written as * .. * or as 0 .. * or as 1 .. * ?
great job Keerti ... Beautifully explained
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)
Have heard of these composition , aggregation , etc terms countless number of times . I just want to get rid of them today !
cool very smart explanation , till best i have seen to start with lld
Very much beneficial❤🎉
keerti purswani has a yt channel --> Aggregation
yt has a keerti purswani channel --> Composition
16:05 She is from Bhopal in Black dress, for those who are also residents of Bhopal. Here she explains about Aggregation vs Composition
Great video. I just loved it. You make it so easy to understand!!!
Thanks.. this is the new topic i learned today !! Very simple and clear explanation 👍👍
wow this was amazing!!
Thanks for this video it clarifies a lot
Thanks Keerti for the amazing explanation! :)
The music you kept at end is funny!:)
Beautiful explanation.. Keep up the good job.
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.
thankyou didi. you made the concepts very clear
V.Good points mentioned to differentiate Aggregation and Composition.
Wall watch has hands(sec, min, hour) ==> Composition
Table has four legs ===> Composition
A shoe has lace ==> Aggregation
A room has Door ==> Aggregation
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
could you explain what the uses relationship is?
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 ?
flyable animal is not same as fly behaviour
and any fly behaviour can be kept in flyable animal class only
@@charan775 I got you ..
@@charan775 thabks
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.
Thanks for explaining these fundamentals clearly. 💯
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
nice work didi :) , wish you best of luck
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 ?
Great Efforts .. Thanks👌
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
Nice i am loving your video tutorial.
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?
Thank you Keerti
keertiii when you give any mock questions... can you please code them in c++ as well please ❤ thank you for existing and your hardwork ❤❤❤
8:12 RBC
Very well explained !
26:00 Coming or Not coming --- Question
Binge watched the whole video 😂 I am going in love with software engineering 💗
Yaaaaaaay! That’s the best comment a teacher can get! ❤️😇
24:37 IS-A relationship for INHERITANCE
very nice explanations
Thank you! Hope you subscribed and shared with your friends! ❤️😇
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 🙏
Very Helpful.
Thanks a lot :)
2:22 UML CD
Great Videos, thanks !
It's amazing
What do you mean by A uses interface B ?
23:13 Quick recap
Hi,can you make a video about logger design app in LLd and which design pattern is perfect? .really appreciate if you assist me
Desktop has a monitor --> aggregation
Car has an engine --> aggregation?
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 ? 😵💫
Thank you for this video.
Excellent 👍
Thank you for the video, it very helpful :)
7:10 List of body parts returned.
please make tutorial on microservices design patterns
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.
Or Am I confusing this with Association ?
Thank you very helpful
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
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.
Bro! you are amazing.
Person has a flight --- aggregation
Flight has a seat --- composition
Uses, is a , has a agg, has a comp
Thank you..
Thanks such a valuable content.
Thank you for showing up! Please do share the videos with your friends! ❤️😇
Thank you so much for amazing content always
Thank you for showing up! Please do share the content with your friends! ❤️😇
very useful
phone has operation system -> composition
phone has sim card -> aggregation
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
Mind blown
no i havent thought static
Please make a whole playlist on LLD, they expect us to be experts in lld even with an year of experience😢
There’s already a playlist and the number of videos are increasing with time.
thank uuuuuuu ❤❤
❤️❤️❤️❤️❤️
keep doing, you mean a lot to us !!!
thanks maam
whats a great video
I watched this video at 0.4x speed to catch up with speed or rate of delivery of spoken words.
great
Voice echo present in recording which can be corrected by professional for just Rs 10k.
Or use free plugin
19:02 that was dark
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.
Crazy
Dependency 😢
Husband --------- Wife (Aggre)
Person ------- Aadhaar card (comp)
😂