Introduction to Java

What is Java?

Java is a high-level programming language and platform developed by Sun Microsystems in 1995. It was created by James Gosling, known as the father of Java.

Key Characteristics:

• Object-Oriented - Built on classes and objects
• Platform Independent - Write once, run anywhere (WORA)
• Secure - Strong security features
• Robust - Strong error handling
• Runs on billions of devices worldwide

Where is Java Used?

• Desktop Applications - Media players, text editors
• Web Applications - E-commerce sites, social media platforms
• Mobile Apps - Android applications
• Enterprise Systems - Banking, ERP systems
• IoT & Embedded Systems - Smart devices, robots
• Gaming - Game development and interactive apps

Your First Java Program

Let's write a simple Java program to print "Hello World":

public class HelloWorld {
            public static void main(String[] args) {
                System.out.println("Hello World");
            }
        }

Hello World

Explanation:

• public class HelloWorld - Defines a class named HelloWorld
• public static void main(String[] args) - Entry point of the program
• System.out.println() - Prints text to the console

Types of Java Applications