Q: How do you test the application to ensure it works correctly?
A: Once both backend and frontend are running, open two browser windows (one in incognito mode and one normal). Join the chat in both windows, exchange messages, and observe real-time updates appearing in each—this confirms correct functionality.
Q: How are user events (join, message, leave) handled in this app?
When a user joins, their name is stored and a “user-joined” event is emitted to other connected clients. Messages are sent using a “receive” event handled by client-side rendering logic. A “left” event is emitted and displayed when a user exits the chat.
Q: What are the high-level steps to build the chat application?
Create a project directory and initialize it with npm init Install the socket.io package Write backend logic in index.js, creating an HTTP server and integrating Socket.IO Set up client-side files (index.html and app.js) with UI and Socket.IO logic Run the application locally and test communication between browser windows.
Q: What tools and libraries are required to follow the tutorial?
A: You’ll need: Node.js — for the server-side runtime, Socket.IO — to enable real-time communication, Visual Studio Code (VS Code) — as the development environment. These tools set the foundation for setting up both backend and frontend components.
Q: What is Socket.IO and why is it used in this tutorial?
A: Socket.IO is a popular JavaScript library that enables real-time, bidirectional communication between clients and servers. It leverages WebSockets and includes fallback options like long polling, ensuring broader compatibility and event-driven architecture—ideal for building interactive chat applications
Q: What happens if the class doesn’t exist at runtime?
A: The code catches ClassNotFoundException and prints a friendly error—gracefully handling missing or misspelled class names.
Q: Is this reflective analysis entirely static, or can it be controlled?
A: It’s dynamic. The tutorial shows how to pass the target class name via command-line arguments to an “Analyzer” class that processes it at runtime—ideal for analyzing classes not known at compile time.
Q: Once I have the Class, what can I actually analyze?
A: You can retrieve: Methods via getDeclaredMethods() Fields via getDeclaredFields() And then loop to display names, types, parameters, return types, etc.
Q: How do I obtain a Class object for runtime analysis?
A: You have three options: Class.forName(“MyClass”) — dynamic loading by name someObject.getClass() — when you already have an instance MyClass.class — available at compile time, even for primitives
Q: What’s the real benefit of using Java Reflection?
A: Reflection gives your program “X-ray” vision into its own structure at runtime—letting you inspect or manipulate methods, fields, constructors, and even invoke those dynamically by name.