Video

Thanks bhai

00:02 Overview of Object Oriented Programming (OOPs) in Java 02:21 Real world entities have behavior (functionality) and properties 07:09 Objects in OOP have properties and behaviors 09:38 Class is the blueprint/template for creating objects. 15:00 Creating objects using the 'new' keyword in Java 17:31 First pillar of OOPs: Data Abstraction 21:49 Achieving data abstraction through interface and abstraction. 24:07 Data abstraction is essential for user interface simplicity and confidentiality. 28:37 Implement data hiding for simplified code 30:47 Data abstraction simplifies client code 35:30 Encapsulation in OOPs 37:49 Encapsulation bundles data and code into a single unit in Java OOPs 42:15 Object-oriented programming emphasizes the need for information exchange between classes. 44:39 Classes have control over their own properties and methods. 49:08 In OOPs, data can be accessed only through methods, not directly. 51:11 Data encapsulation is like keeping data inside a capsule for protection. 55:41 Understanding the concept of inheritance in Java 58:09 Car type and object creation in OOPs 1:03:25 Inheritance and method ambiguity in object-oriented programming. 1:05:53 Diamond problem in OOPs 1:10:23 Polymorphism in Java 1:12:33 Method overloading is known as static polymorphism or compile time polymorphism. 1:17:19 Method overloading based on return type is not allowed 1:19:25 Overloading vs. Overriding in Java 1:23:52 Method Overloading vs Method Overriding in OOPs 1:26:13 Inheritance and has a relationship in OOPs concept 1:30:48 Understanding 'has a' relationship in OOPs 1:33:16 Objects in OOP are strongly related and impact each other

Hey thanks for sharing this approach. Mine was different and is described below - both for reference and feedback: ``` case class Item(id : String, type : ItemType) typeDef Discount = double interface ShoppingCart { def getPrice(items: List<Item>, coupouns : List<Coupon>) } interface Coupon { def discount(items : List<Item>) : List<Discount> def isApplicable(items : List<Item>) : Boolean } ``` Given the requirements, I saw that coupons are applicable on sequence of products in the cart rather than just the product. So we get: ``` class FlatDiscountCoupon(discountFraction : Double = 0.1) implements Coupon { def isApplicable(items : List<Item>) = true; def discount(items : List<Item>) = items.map(_ => 1 - discountFraction); } class NextItemDiscountCoupon(discountFraction : Double, item : Item) implements Coupon { def isApplicable (items : List<Item>) = items.contain(item) def discount(items : List<Item>) = { val discounts = Arrays.size(items.length).fill(1); var discountNext = false; for(int i = 0; i < items.length; i++) { if(items[i].equals(item)) { discountNext = true; break; } } if(i+1 < items.size()) { discounts.set(i+1,1 - discountFraction) } discounts; } } class NthItemOfTypeTDiscount(discountFraction : Double, type : ItemType, n : Int) implements Coupon { def isApplicable(items : List<Item>) = items.filter(item => item.type.equals(type)).size > n; def discount(items : List<Item>) = { val discounts = Arrays.size(items.length).fill(1); var discountNext = false; int numberOfItemsForType = 0; for(int i = 0; i < items.length; i++) { if(items[i].type.equals(itemType)) { numberOfItemsForType++; if(numberOfItemsForType == n) { discountNext = i; break; } } } if(i+1 < items.size()) { discounts.set(i+1,1 - discountFraction) } discounts; } } ``` I made coupons depend on the Product (and not shopping cart, as it might mean more things) and let the coupon compute the total discount fraction for each product. A tthe end we can have one method in shopping cart which calculates final price given different coupons.

Hi Shrayansh, Great explaination. I have a query, where does NPCI (National payment corporation of India) comes into the picture in your design? Will it come under Instrumentation Service as it contains the mapping of Aadhaar card linked with the bank accounts?

Please bring your playlist fast !!!!….my job Instake

great explanation... thanks sir ji... though the video length is 15min only.. one might need to spend more time understanding how this chain is transferring their responsibilities to next chained object.

⭐⭐⭐⭐⭐

hats off to your skills in explaining this very important topic so easily.... Great work brother 😃

day 2 - lecture 4 done these lectures are very helpful

Day 2 - lecture 3 done this was awesome please keep making such content

what if one observer wants to get notfied for some obervable and not for othes then in that case we need to use if else in each observer update functioin then what is the point of keeeping a observable interface in observer ?? evern ater doing this we need to add if else ?

Good explanation🎉 I think Stack is better fit than List in CareTaker

Day2 video 2 done

Great video! Though I find one thing confusing in your video - you mentioned that we need to configure a separate proxy for each application. it is correct that proxies operate at application level but it means that it can operate at the application layer (Layer 7 of the OSI model) and are aware of the specifics of different protocols like HTTP, HTTPS, and FTP. The modern proxies can handle different types of proxies, for eg. Squid proxy can manage both HTTP and HTTPS traffic.

We can create a new arraylist in the constructor and make a copy of the list and that would solve the problem too ., right?

Great content! Just one input - if we have a default constructor along with a parameterized constructor, two beans should be created.

please conmpete this playlist

day 1

Nice video. Also please keep on adding more live coding examples along with concepts.

litreally , amazing content , from monday there will be my interviews , if i will get selected than i will defenatly return to this video and comment over this .......amazing one

Best explanation of SOLID principles

thnks for the vedio, sirJI it's a request git mai bhi upload kiya karo

This is a superb video, this gave me a very clear understanding of payment gateway LLD.

@ConceptandCoding Why we are using @Override in Farmhouse and other similar classes, when we are just simply implementing the function defined in BasePizza class? I tried without overriding also, it works just fine. Also some results on Google tells that it is optional to Override methods in subclass while implementing them. Any thoughts on this?

Bro make a video on code review what are the things to keep in mind while doing code review please

Link to buy please?

superrrrrr!

@ConceptandCoding just joined the community, can't find the Notes link in the Member Community Post

Hello sir! How much system design is required for freshers' SDE/SWE/Full-stack/Frontend/Backend roles?

Bro nice one, but if possible please make this video like the one, you explained memory management & Garbage collection without PPTs

God bless you ! Very nice explanation !

It was great 😊 # Design Meeting Scheduler ## Requirements: - there are n given meeting rooms - Book a meeting room for a given time slot and capacity (start time, end time, capacity) - send notification to the user who are invited to the meeting - use meeting room calendar to track the meetings date and time [Every meeting room has calender] Didn't get this ? ## Thinking - We can use a min heap to store the meeting rooms based on the end time of the meeting - We can use a hashmap to store the meeting room and the meeting details - We will use observer design pattern to send notification to the user who are invited to the meeting - Cancel/Update a meet? Yes - User can join late/early ## Algos thinking - Min Heap for allocating rooms - Observer Pattern for notifying ## Flow - There will users (N) - There will be meeting rooms (M) - Can fetch all meeting rooms available at desired slot with filter of capacity - Can book a meeting room and add the meeting details to the meeting room calendar - Have to send notification to the user who are invited to the meeting - Cancel/Updates should update users and meeting room calendar (Whole meet can be cancelled or one user can cancel) - All Meeting room will be available 24 Hrs ## Entities - User (id, name, email, phone) - MeetingRoom (id, name, capacity, location{floor, building}) - Meeting (id, start_time, end_time, capacity, meeting_room, users_invited [User1, User2, User3]) - Calender (List<Intervals> bookedIntervals) - Intervals (start_time, end_time, date) ## Managers - MeetingRoomManager (List<MeetingRoom>, Map<MeetingRoom, Calender>, CRUD a meeting room, getAllMeetingRooms) - MeetingScheduler (bookMeeting(create Meeting), cancelMeeting, updateMeeting, getAvailableMeetingRooms(capacity, Interval)) - NotificationManager (sendNotification)

Thanks

Hello I paid to join as a member but it is not allowing me to please update my request

Hi Shrayansh do TTFB and latency are same things?

Shreyansh, you said while creating bean spring calls default constructor . so do we need to provide a default constructor for every class that i want to make bean of ?

Please respond bro

Bro I tried to join as a member but my money deducted but finally I am getting something went wrong msg