Java OOPs Concepts

The Four Pillars of OOP

1. Encapsulation — bundling data and methods together
2. Inheritance — reusing code across related classes
3. Polymorphism — one interface, multiple implementations
4. Abstraction — hiding complex implementation details

Example

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

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