Core Java Tutorials by Noel Kamphoa

Abstract Classes and Interfaces in Java

Compare abstract classes vs interfaces in Java to understand their differences, use cases, and when to use each with examples

Discover how abstract classes in Java enable shared logic and enforce design contracts with real-world examples and best practices

Explore interfaces in Java with examples. Learn how they enable abstraction, multiple inheritance, and clean, testable design.

Learn how to apply the Single Responsibility Principle in Java with real-world examples. Write cleaner, modular, and testable code.

Learn the Open/Closed Principle in Java. Build code that’s easy to extend and maintain without modifying existing functionality.

Understand the Liskov Substitution Principle in Java with clear examples. Learn how to build reliable and extensible class hierarchies.

Apply the Interface Segregation Principle in Java to build cleaner, modular code. Avoid bloated interfaces and improve testability.

Master the Dependency Inversion Principle in Java. Learn to write flexible, testable code by depending on abstractions, not implementations.

Master the SOLID principles in Java with real-world examples. Learn how to write clean, maintainable, and scalable object-oriented code

Avoid bugs in your Java code by learning the difference between == and .equals() for string comparison, and how to do it right.