Java Object-Oriented Programming (OOP)

Object-Oriented Programming (OOP) is a programming paradigm based on the concept of "objects", which are instances of classes. Java is an object-oriented language that supports the following features:

• Encapsulation - Bundling data and methods that operate on the data within one unit (class).
• Inheritance - Mechanism where one class inherits the properties and behavior of another class.
• Polymorphism - Ability to take many forms, i.e., methods or classes behaving differently based on the context.
• Abstraction - Hiding complex implementation details and showing only essential features.

Creating a Simple Class and Object

public class Person {
    String name;
    int age;

    // Constructor
    public Person(String name, int age) {
        this.name = name;
        this.age = age;
    }

    // Method
    public void introduce() {
        System.out.println("Hello, my name is " + name + " and I am " + age + " years old.");
    }
}

public class OOPExample {
    public static void main(String[] args) {
        Person person1 = new Person("John", 25);
        person1.introduce();
    }
}
    

This example demonstrates how to create a simple class Person with a constructor and a method introduce. An object of the class is created in the main method and its introduce method is called.