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This is in continuation of this LLD-06 part - 1 you can see that article here Link Adding a New Drink Should Be Boring Suppose we want to add a new beverage tomorrow. The ideal change is not: modify CoffeeMachine modify Inventory modify PreparationUnit add five switch cases It…
A coffee machine becomes an interesting LLD problem when adding a new drink should not require another subclass. Model recipes as data, protect ingredient inventory and keep machine orchestration separate from preparation hardware.
An elevator system is not just a lift moving between floors. The interesting design problem is deciding which car should answer a request and how each car should order its stops without mixing building-level scheduling with elevator-level movement.
A library system becomes interesting the moment three copies of the same book exist. Learn how to model titles, physical copies, loans and reservations without putting every responsibility into one class.
Tic-Tac-Toe becomes an interesting LLD problem when the board size changes, rules evolve, invalid moves appear and the game engine must remain maintainable.
A vending machine is not mainly an inventory problem. It is a state problem: inserting money, selecting products, cancelling, dispensing and rejecting invalid actions must all behave differently depending on what happened before.
A Parking Lot looks like a simple LLD problem until multiple vehicle types, spot allocation, tickets, pricing and concurrent entries appear. Build it step by step instead of memorising a class diagram.
A Parking Lot looks like a simple LLD problem until multiple vehicle types, spot allocation, tickets, pricing and concurrent entries appear. Build it step by step instead of memorising a class diagram.
Understand how UPI connects apps, PSPs, banks and NPCI, with a developer-focused look at payment flow, authentication, failures and settlement.
