Java 17 features

Sealed Classes in Java – Complete Guide with Real-World Examples

Nikhil Naoghare / March 29, 2026

If you’ve ever designed a class hierarchy and thought:
“I wish I could allow only specific classes to extend this…”
Then sealed classes are exactly what you need.
This feature is not just syntactic sugar — it fundamentally improves how we model real-world problems in Java.

Java, JDK 17, JDK 21

Java Pattern Matching (Java 16 → 21)

Nikhil Naoghare / March 29, 2026

If you’ve been writing Java for a while, you probably remember this annoying pattern:

👉 Check type using instanceof
👉 Cast manually
👉 Then use the object

Pattern Matching removes this boilerplate and makes your code cleaner, safer, and more readable.
Let’s go step by step and understand how it evolved.