Can you explain the main ideas and principles of object-oriented programming?

Object-oriented programming (OOP) is based on several key principles:

• Encapsulation — combining data and methods that operate on that data into a single object, hiding internal implementation details from the outside world.
• Inheritance — a mechanism that allows creating new classes based on existing ones, inheriting their properties and behaviors.
• Polymorphism — the ability of objects of different classes to respond to the same messages (methods) in different ways.
• Abstraction — highlighting essential characteristics of an object while hiding non-essential details.

These principles help create flexible, extensible, and maintainable programs.

Example in Java:

class Animal {
    void sound() {
        System.out.println("Some sound");
    }
}

class Dog extends Animal {
    @Override
    void sound() {
        System.out.println("Bark");
    }
}

public class Main {
    public static void main(String[] args) {
        Animal myDog = new Dog();
        myDog.sound(); // Outputs "Bark" — example of polymorphism
    }
}