105. How to Use Java Sealed Classes: Rules, Syntax, and Real-World Examples

Описание: Unlock the power of controlled inheritance in Java!
Are you tired of the "all-or-nothing" dilemma in Java inheritance? For years, developers had to choose between leaving a class wide open for extension or locking it down completely with final. In this lecture, we dive into Sealed Classes, a game-changing feature that lets you define exactly which classes belong to your hierarchy.
In this video, you will learn:
• The Core Problem: Why Abstract and Final classes left a gap in application design.
• The Solution: How to use the sealed and permits keywords to act as a security guard for your code.
• The 3 Golden Rules: Understanding the mandatory choices for subclasses: final, sealed, and non-sealed.
• Real-World Example: Building a secure Payment System (CreditCard, PayPal, Crypto) to prevent bugs before they happen.
• Sealed Interfaces: How to apply these principles to interfaces for fine-grained control.
By explicitly defining your object hierarchy, you make your code robust, maintainable, and easier for the compiler to validate.

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