What is Java?

Java is a high-level, object-oriented programming language. It’s platform-independent — you write your code once and it runs anywhere (with a Java Virtual Machine, or JVM). Java is widely used for developing web applications, enterprise software, games, and Android apps.

Why Java?

• Platform-Independent (Write Once, Run Anywhere).
• Robust and Reliable — automatic garbage collection, strong memory management.
• Scalable — used by large enterprises for heavy workloads.
• Security — a strong API for developing secured applications.
• Large ecosystem of libraries and community support.

Java Introduction with Examples:

Let's see a simple example:

// This is a simple Java program
public class HelloWorld {
    public static void main(String[] args) {
        System.out.println("Hello, World!");
    }
}

Explanation:

• public class HelloWorld — We define a class with the name HelloWorld.
• public static void main(String[] args) — This is the main method, which is the entry point for the Java application.
• System.out.println("Hello, World!"); — Prints the text to console.

Another Example (Addition of two numbers)

public class AddNumbers {
    public static void main(String[] args) {
        int num1 = 10;
        int num2 = 20;

        int sum = num1 + num2;

        System.out.println("The sum is: " + sum);
    }
}

Explanation:

• We declare two integer variables, num1 and num2.
• We compute their sum and store it in a new variable sum.
• We then print the sum to console.

Summary:

Java is:

• Platform-independent
• Robust, Reliable, and Scalable
• Object-oriented and Security-centric

Hello World and Addition demonstrate:

• The structure of a Java application
• How we perform simple operations and print results to console