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Tutorials under 'Java 21'

final-class-method-variable-java

Final Class, Final Method, Final Variable – OOP Implications in Java

Understand the role of `final` keyword in Java OOP—learn how final classes, methods, and variables impact design, inheritance, and flexibility

Immutability Final Variable Encapsulation Java 21 Final Class Final Method Java OOP Sealed Classes Inheritance Java Best Practices Final Keyword

singleton-pattern-java

Singleton Pattern in Java: Ensure a Single Instance Across Your App

Learn the Singleton Pattern in Java with real-world examples, code walkthroughs, best practices, anti-patterns, and modern implementation strategies

Java Global Access Lazy Initialization Java 21 Singleton Pattern Design Patterns Thread Safety Creational Patterns Java 8