Linux

1. Start a terminal session if necessary
2. Type:
   

   java -version

Mac OS X

1. Start a terminal session if necessary
2. Type:
   

   java -version

Windows

1. Open a Command Prompt window
2. Type:
   

   java -version

1. Click on the Start menu
2. Select Settings
3. Select Control Panels
4. Select Java Plug-in
   
   
   
   
   
5. Click on the About tab