Author Archives: Stanislav_Panteleev

🎭 What is Abstraction? let’s say we have 100 props of object in real world, but we need only 10 of them for our task, so we abstract from reality for our task. Abstraction is the process of hiding the … Continue reading →

🦸 What is Polymorphism? Polymorphism means “many forms.” It’s the ability of a single method, class, or object to take different forms or behave differently depending on the context. 🔗 Simple Definition One interface, many implementations.

👨‍👦 What is Inheritance? Inheritance is the mechanism in Object-Oriented Programming where one class (child/subclass) derives (or inherits) properties and behavior (methods) from another class (parent/superclass). It’s like saying: “A child class gets all the traits of its parent class.” … Continue reading →

🛡️ What is Encapsulation? Encapsulation is one of the core principles of Object-Oriented Programming (OOP). It means hiding the internal details (data) of an object and only exposing the necessary functionality (methods) to the outside world. This helps to protect … Continue reading →

Object-Oriented Programming (OOP) is a programming paradigm that organizes code into objects, which are instances of classes. These objects represent real-world entities and can contain attributes (data) and methods (behavior). The main goal of OOP is to model complex systems … Continue reading →

The JVM Specification (shortened as JVM Spec) is critical for the entire Java ecosystem — it’s essentially the contract that defines how all JVMs should behave, ensuring compatibility across different platforms, tools, and implementations.

Annotations in Java are metadata attached to code elements — classes, methods, fields, parameters, etc. Example: Annotations can be retained at different levels: Retention Policy Meaning Example SOURCE Only exists in source code (discarded by compiler) @Override CLASS Stored in … Continue reading →

Let’s break down Java Agents and how they interact with the JVM — this is a super useful topic if you’re into instrumentation, monitoring, performance tuning, or writing tools like profilers or tracers.

💻 Memory Addressing — The Root of It All 1️⃣ What does “32-bit” mean? A 32-bit CPU (or app) means that pointers (memory addresses) are 32 bits long.That’s a binary number with 32 ones and zeros, meaning:

The difference between 32-bit JVM and 64-bit JVM is mainly about how much memory the JVM can address and how it handles pointers, but there are other important differences too. Let me break it all down for you. 📐 1. … Continue reading →