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Java

Java is a powerful, object-oriented programming language used for building cross-platform applications, including web, desktop, and mobile applications. This guide will help you install Java on your system.

Step 1: Download Java

1. Go to the official Oracle Java Download page.
2. Select the latest Java SE version and download the installer suitable for your operating system (Windows, macOS, or Linux).

Step 2: Install Java

On Windows:

1. Run the downloaded .exe file.
2. Follow the installation wizard and complete the setup.
3. Once installed, verify the installation by running the following command in Command Prompt:

   java -version
   

On macOS:

1. Run the downloaded .dmg file and follow the installation instructions.
2. Verify installation using:

   java -version
   

On Linux:

1. Open the terminal and run:

   sudo apt update
   sudo apt install default-jdk
   

2. Verify installation:

   java -version
   

Step 3: Set Up JAVA_HOME Environment Variable

Setting up the JAVA_HOME variable is essential for Java-based applications.

On Windows:

1. Open System Properties > Advanced > Environment Variables.
2. Add a new system variable:
   • Variable name: JAVA_HOME
   • Variable value: Path to Java installation (e.g., C:\Program Files\Java\jdk-XX.X.X)

On macOS and Linux:

1. Open the terminal and edit your profile file:

   nano ~/.bashrc  # or ~/.zshrc
   

2. Add the following line:

   export JAVA_HOME=$(dirname $(dirname $(readlink -f $(which java))))
   

3. Apply changes:

   source ~/.bashrc
   

Step 4: Verify Installation

Run the following command to check if Java is correctly installed and configured:

java -version

Step 5: Run an Example Java Program

1. Open a text editor and create a new file named HelloWorld.java.
2. Copy and paste the following Java code:

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

3. Save the file and navigate to the directory where it is saved using the terminal or command prompt.
4. Compile the program using:

   javac HelloWorld.java
   

5. Run the compiled Java program:

   java HelloWorld
   

6. You should see the output:

   Hello, World!
   

Conclusion

You have successfully installed Java on your system! You can now start developing Java applications using an IDE like IntelliJ IDEA or Eclipse.

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