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    Java is a class-based, object-oriented language following the principle of Write Once, Run Anywhere (WORA). Every Java program follows a structured format, starting from package declarations to the main method where execution begins.

    1. Hello World Program The simplest Java program demonstrates syntax and structure.

    public class HelloWorld {
    public static void main(String[] args) {
    System.out.println("Hello, World");
    }
    }
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    • Class Declaration: public class HelloWorld defines the class.

    • Main Method: public static void main is the entry point.

    • Output Statement: System.out.println prints text with a newline.

    2. Data Types and Variables Java supports primitive (byte, int, double, boolean, etc.) and non-primitive (String, Arrays, Objects) types.

    public class DataTypesDemo {
    public static void main(String[] args) {
    int age = 25;
    double pi = 3.1416;
    String name = "Java";
    System.out.println("Name: " + name + ", Age: " + age + ", Pi: " + pi);
    }
    }
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    • Local Variables: Declared inside methods.

    • Instance Variables: Declared in a class, unique per object.

    • Static Variables: Shared across all objects.

    Is Java a programming language?
    Java is a popular high-level, object-oriented programming language that was originally developed by Sun Microsystems and released in 1995. Currently, Java is owned by Oracle, and more than 3 billion devices run Java. Java runs on a variety of platforms, such as Windows, Mac OS, and the various versions ofUNIX.
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    GeeksForGeeks
    https://www.geeksforgeeks.org/java/java-programming-basics
    Java Programming Basics - GeeksforGeeks
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  2. W3School
    https://www.w3schools.com › java

    Java Tutorial - W3Schools

    Java is one of the world's most widely used programming languages. Learn Java with simple explanations, practical examples, exercises, and challenges that help you build …
    Examples in Each Chapter

    Our "Try it Yourself" editor makes it easy to learn Java. You can edit Java code and view the result in your browser. Click on the "Run example" button to see how it works.

    Java Exercises

    Many chapters in this tutorial end with an exercise where you can check your level of knowledge. See all Java Exercises

    Learn by Examples

    Learn by examples! This tutorial supplements all explanations with clarifying examples. See All Java Examples

    My Learning

    Track your progress with the free "My Learning" program here at W3Schools. Log in to your account, and start earning points! This is an optional feature. You can study at W3Schools without using My Learning.

  3. GeeksForGeeks
    https://www.geeksforgeeks.org › java › java-programming-basics

    Java Programming Basics - GeeksforGeeks

    Aug 20, 2025 · Java is a class-based, object-oriented programming language that is designed to be secure and portable. Its core principle is “Write Once, Run Anywhere” (WORA), meaning Java code can …

  4. Java Tutoring
    https://javatutoring.com › java-programs

    Java Programs – 500+ Simple & Basic Programs With …

    Feb 25, 2026 · Here we covered over the list of 500+ Java simple programs for beginners to advance, practice & understood how java programming works. You …

  6. TutorialsPoint
    https://www.tutorialspoint.com › java

    Java Tutorial

    This Java tutorial has been written for beginners to advanced programmers who are striving to learn Java programming. We have provided numerous practical …

  7. Codecademy
    https://www.codecademy.com › learn › learn-ja

    Java Tutorial: Learn Java Programming | Codecademy

    Learn to code in Java — a robust programming language used to create software, …

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  8. Java Guides
    https://www.javaguides.net › java-tutorial-learn...

    Java Tutorial | Learn Java Programming with Examples

    This core Java Tutorial contains the links of all the tutorials in a systematic order starting from beginner’s level to the advanced topics. The source code examples …

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  10. Programiz
    https://www.programiz.com › java-programming › examples

    Java Examples - Programiz

    The best way to learn Java programming is by practicing examples. The page contains examples on basic concepts of Java. You are advised to take the references from these examples and try them on …

  11. ProgrammingOneOnOne
    https://programmingoneonone.com › java-programs

    100+ Java Programs for Practice

    Whether you are preparing for Java exams, coding interviews, competitive programming, or improving your core programming skills, these Java practice …

  12. oracle.com
    https://docs.oracle.com › javase › tutorial › java › index.html

    Trail: Learning the Java Language (The Java™ Tutorials) - Oracle

    This beginner Java tutorial describes fundamentals of programming in the Java programming language

  13. GeeksForGeeks
    https://www.geeksforgeeks.org › java › java...

    Java Programs - Java Programming Examples

    Sep 25, 2025 · This page covers Java programming examples from basics like Fibonacci, Prime numbers, Factorials and Palindromes to advanced topics such …

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