What is Java?

Java is a general-purpose, class-based, object-oriented programming language used for building desktop, web, mobile, enterprise, and big data applications.

Java follows the principle of WORA (Write Once, Run Anywhere), allowing programs to run on different platforms without modification.

Origin of Java

Java was developed by James Gosling and was initially released by Sun Microsystems before being acquired by Oracle Corporation.

• Platform-independent
• Object-oriented
• Secure
• Reliable
• Fast
• Scalable

Definition list

• Java: A general-purpose, object-oriented programming language used for developing software applications.
• WORA (Write Once, Run Anywhere): A Java feature that allows programs to run on multiple platforms without recompilation.
• JDK (Java Development Kit): A software package containing tools required to develop and run Java applications.
• JVM (Java Virtual Machine): A virtual environment that executes Java bytecode on different operating systems.
• Compiler: A tool that converts Java source code into bytecode.

Applications of Java

Desktop applications

Java provides powerful APIs such as Swing, AWT, and JavaFX for building graphical user interface applications on Windows, Linux, and macOS.

• Text editors
• Media players
• Business management software

Mobile applications

Java is one of the most popular languages for Android application development with strong Android SDK support and compatibility with Kotlin.

• Twitter
• Spotify

Game development

Java is used in Android, online, and 3D game development with support for powerful 3D engines.

Web applications

Java powers dynamic web applications through technologies such as Servlets, JSP, Spring Framework, and Hibernate.

Enterprise software development

Java is highly preferred for enterprise-level applications because of its security, reliability, and scalability.

• Banking
• Insurance
• Retail
• Healthcare

Big data technologies

Many big data technologies are built using Java thanks to its performance and scalability.

• Hadoop
• HDFS

Embedded systems and IoT

Java is used in smart cards, IoT devices, embedded systems, and utility devices because of its portability and libraries.

Java download steps in Windows

1. Visit the Oracle Java Downloads page.
2. Click Products, select Java, then click Download Java.
3. Scroll down and choose the Windows download option.
4. Download the JDK installer (typically x64 Installer).
5. Verify the installer file is in your Downloads folder.

Java installation steps in Windows

1. Open the downloaded JDK installer file.
2. Run the installer (double-click or Run as Administrator).
3. Click Next to start the setup wizard.
4. Choose an installation location and click Next.
5. Wait for installation to finish and click Close.

How to write your first Java program

1. Open Notepad or another text editor.
2. Type the Java program shown below.
3. Save the file with the class name.
4. Because the class name is Main, save it as Main.java.

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

How to compile and run a Java program

1. Open Command Prompt in the folder where Main.java is saved.
2. Compile the program with javac Main.java.
3. Run the program with java Main.

javac Main.java
java Main

Output

Hello World

Why learn Java?

• Easy to learn with beginner-friendly syntax.
• Platform independent across operating systems.
• Large community support and documentation.
• High demand in industry for enterprise systems.

FAQ

Who is the father of Java?

James Gosling developed Java at Sun Microsystems.

What does WORA mean in Java?

WORA stands for Write Once, Run Anywhere.

What is the difference between JDK and JVM?

JDK is the development toolkit, while JVM executes Java bytecode.

Meta description

Learn what Java is, its features, applications, installation steps, and how to run your first Java program with this beginner-friendly guide.