Introduction to Java Programming

 

🔰 Introduction to Java Programming

Java is a high-level, object-oriented programming language developed by Sun Microsystems (now owned by Oracle Corporation). It is widely used for building applications across platforms — from desktop to mobile to enterprise systems.

✨ Key Features of Java:

  • Platform Independent: "Write once, run anywhere" — Java code runs on any device with the Java Virtual Machine (JVM).

  • Object-Oriented: Everything in Java is an object; this promotes reusability and modularity.

  • Simple and Familiar: Syntax is similar to C/C++, making it easier for students with prior programming exposure.

  • Secure: Java includes built-in security features like bytecode verification.

  • Robust: Strong memory management and exception handling.

  • Multithreaded: Supports concurrent execution of two or more threads.

✅ Structure of a Java Program


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

🔍 Explanation:

  • public class HelloWorld: Every Java program must have at least one class. Here, it's HelloWorld.

  • public static void main(String[] args): The main method is the entry point of any Java application.

  • System.out.println(...): Prints text to the console.

📌 How to Run:

  1. Save the file as HelloWorld.java.

  2. Open a terminal/command prompt.

  3. Compile using:

    javac HelloWorld.java

  4. Run the program:

    java HelloWorld

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