Design a Vending Machine | LLD Interview Question | State Design Patterns | OOPS | Java

Tags

#designpatterns #builderpattern #lld #oops #java #lowleveldesign #lld #statepattern #vendingmachine

[vatsalmaheshwari]

I believe that this does not fulfill Interface Segregation principle of SOLID principles. There is no need of insertCoin and presButton in some cases. We should make different interfaces if any state does not want to implement a function. Tell me if I am wrong. I would love to get corrected.

[rohitshaw]

A much needed content. Very few people are there who create videos on this topic. Thank you for your initiative 😁.

[sarfrazz]

Riddhi, could you please share the git repo link for the same?

[fares.abuali]

Thank you so much, Mr. Riddhi.

Consie & Informative

[rohitshaw]

Also can you please wrap the whole content in single playlist, so it will be easier for me to track all the videos. Thank You.

[snehomoymaitra]

Amazing content as many of the companies are asking LLD questions in their SDE-1 (e.g - freshers) interviews.

[aishwaryapani]

Very helpful video, at a time when there is a dearth of LLD resources. Thank you for making these ❣

[Kapil_Sharma_Engineer]

Small doubt is do we really need a State interface on which Vending machine is dependent. I feels like we can have a enum of states or a current state variable based upon that we can give the functionality output

[soumyarv]

Can you please explain any idea on how to implement online payment in place of adding a coin .

[abhishekrai]

I really liked the design as well as the explanation. Please create more such LLD design content👍

[obsessiveDreamer]

Are you passing the object of the vending machine into all three states' constructors as a reference or a copy of the object? I mean all three states is working on the same instance of vending machine?

[Maneeshce]

Where is the github url to find the code ??

[zahidkhan-lnjv]

Great explanation! Can we use the same design pattern to design a shopping cart?

[divyajyotibasu]

Hi, Thanks for the helpful tutorial. If possible kindly share the codebase in a repository. Regards!

[harshraj_]

It's kind of strange that states need vending machine to initiate, and vending machine meeds states. Looks like a kind of circular dependency, and becomes more confusing when you think composition in terms of " class has a" property.

Also, taking out inventory instance out of vending machine class, and performing operations on it doesn't sound quite good to me. Wouldn't it be more better if vending machine rather exposes some methods to operate on inventory, rather than giving off its internal objects to outsiders ?

[rishav]

need more LLD videos like this ....please

[tanveer.shaikh]

instead of throwing illegal state can we sent some warning and be on same state

[nikhilk]

Great explanation. Can you please share link to this code repo

[akankshagaur]

can we get the source code link as well @Riddhi Dutta

[pratosh]

is there any github repo for this design?