Low Level Design

Singleton Pattern

Factory Method Pattern

Abstract Factory Pattern

Builder Pattern

Prototype Pattern

Object Pool Pattern

Dependency Injection

Multiton Pattern

Adapter Pattern

Decorator Pattern

Facade Pattern

Proxy Pattern

Composite Pattern

Bridge Pattern

Flyweight Pattern

Filter / Chain of Responsibility Pattern

Observer Pattern

Strategy Pattern

Command Pattern

Iterator Pattern

Template Method Pattern

State Pattern

Chain of Responsibility

Mediator Pattern

Memento Pattern

Visitor Pattern

Single Responsibility Principle

Open/Closed Principle

Liskov Substitution Principle

Interface Segregation Principle

Dependency Inversion Principle

Design a Parking Lot

Design an Elevator System

Design a Library Management System

Design an Online Bookstore

Design an ATM Machine

Design a Chess Game

Design Snake and Ladder Game

Design a Hotel Management System

Design a Movie Ticket Booking System

Design a Ride-Sharing App like Uber

Design a Food Delivery App like Swiggy

Design a Notification System

Design a Rate Limiter

Design an LRU Cache

Design a Pub-Sub System

UML Class Diagrams

Composition over Inheritance

Interface vs Abstract Class in Java

Cohesion & Coupling