To install and set up Java 17 on your system, follow the steps below. The process may vary slightly depending on your operating system.

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On Windows

1. Download Java 17
   • Go to the official Oracle JDK download page or OpenJDK 17 Downloads if you prefer an open-source version.
   • Select the appropriate installer for your Windows version (e.g., .msi or .zip).
2. Install Java 17
   • Run the .msi installer file and follow the setup instructions.
   • Install Java in the default directory or specify a custom directory (e.g., C:\Program Files\Java\jdk-17).
3. Set Environment Variables
   • Open the Start menu, search for “Environment Variables,” and click on “Edit the system environment variables.”
   • In the System Properties window, click on the “Environment Variables” button.
   • Under “System Variables,” find the Path variable and click Edit.
   • Add the path to the bin directory of your Java installation (e.g., C:\Program Files\Java\jdk-17\bin).
   • Click OK on all windows to save your changes.
   • Optionally, set a JAVA_HOME variable:
     • Click New under “System Variables.”
     • Name the variable JAVA_HOME and set its value to the path of your Java installation (e.g., C:\Program Files\Java\jdk-17).
4. Verify Installation
   • Open a Command Prompt and run:

   java -version
   

   • If installed properly, it will display the Java 17 version.

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On macOS

1. Download Java 17
   • Visit the Oracle JDK or OpenJDK website, and download the .dmg installer for macOS.
2. Install Java 17
   • Open the .dmg file and follow the installation instructions.
   • Java will be installed, usually in /Library/Java/JavaVirtualMachines/.
3. Set Environment Variables (Optional)
   • Open a terminal and edit the ~/.zshrc (for zsh users) or ~/.bash_profile (for bash users) file using a text editor.
   • Add the following lines to set the JAVA_HOME variable:

   export JAVA_HOME=$(/usr/libexec/java_home -v 17)
   export PATH=$JAVA_HOME/bin:$PATH
   

   • Save and close the file, then reload the shell configuration:

   source ~/.zshrc
   

   • Note: The /usr/libexec/java_home command automatically detects installed Java versions.
4. Verify Installation
   • Run the following in Terminal:

   java -version
   

   • It should show the Java 17 version.

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On Linux

1. Install OpenJDK 17
   • Use your package manager to install OpenJDK 17:
     • For Debian/Ubuntu-based systems:

     sudo apt update
     sudo apt install openjdk-17-jdk
     

     • For Red Hat/CentOS/Fedora-based systems:

     sudo dnf install java-17-openjdk-devel
     

2. Set Default Java Version
   • If multiple Java versions are installed, you can set Java 17 as the default:

   sudo update-alternatives --config java
   

   • Select the path for Java 17 from the list.
3. Set Environment Variables
   • Edit the ~/.bashrc or ~/.zshrc file and add:

   export JAVA_HOME=/usr/lib/jvm/java-17-openjdk
   export PATH=$JAVA_HOME/bin:$PATH
   

   • Save the file and reload it:

   source ~/.bashrc
   

4. Verify Installation
   • Run the following command:

   java -version
   

   • It should display details about Java 17.

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Optional: Verify Java Compiler

To ensure the javac compiler is working:

javac -version

That’s it! Now Java 17 is installed and ready to use.