1. How Java is Installed

To use Java on a computer, we install the Java Development Kit (JDK) from Oracle Corporation.

Steps to Install Java:

1. Go to the official website of Java.

2. Download the JDK (Java Development Kit) for your operating system (Windows/Linux/Mac).

3. Run the downloaded installer.

4. Follow the installation instructions and click Next → Install.

5. After installation, set the PATH environment variable.

6. To check if Java is installed, open Command Prompt and type:

java -version

7. If Java is installed correctly, the version of Java will be displayed.

2. Why Java is Used

Java is widely used because it has many advantages.

Reasons for using Java:

Platform Independent – Java programs can run on any system using the JVM (Java Virtual Machine).

Object-Oriented – Supports concepts like class, object, inheritance, and polymorphism.

Secure – Java has strong security features.

Portable – Java programs can run on different devices.

Robust – Handles errors efficiently.

Multithreading – Allows multiple tasks to run simultaneously.

Applications of Java:

Web applications

Mobile applications (Android)

Desktop software

Enterprise applications

Cloud-based applications

3. Types of Java

Java mainly has four types (editions):

1. Java SE (Standard Edition)

Used for basic Java programming and desktop applications.

2. Java EE (Enterprise Edition)

Used for large-scale enterprise and web applications.

3. Java ME (Micro Edition)

Used for small devices like embedded systems and mobile devices.

4. JavaFX

Used for creating rich graphical user interface (GUI) applications.