Object-oriented programming (OOP) is everywhere in Java. Yet fundamental concepts like inheritance , encapsulation , and polymorphism are often misunderstood or even misapplied. The result: brittle, difficult-to-maintain code and a shaky architecture.

Imagine being able to see through walls without using a camera. This isn't science fiction anymore: MIT researchers have developed technology that uses radio signals to detect the posture, movements, and even the identity of a person hidden behind a solid obstacle.

In today's tech world, Application Programming Interfaces (APIs) are essential tools that allow applications to communicate seamlessly...