Installing Java (Windows & UNIX/Linux)

1. Download the version of Java for your operating system at http://java.com/download/
2. Follow the instructions linked from the same page to install Java on your system.
3. You may need to restart your computer or relaunch your web browser for Java to be recognized (this includes UNIX/Linux workstations).

Installing Java (Macintosh)

Mac OS 10.6 "Snow Leopard" and older

The recommended method for installing Java is via Mac OS X's built-in Software Update feature. This ensures you have the most up-to-date, secure version of Java from Apple.

1. Click the Apple menu and select Software Update...
   
2. In the Sofware Update window, install all Java-related updates as well as all Security Update patches, which may contain the latest Java fixes.

You may need to restart your Mac if prompted.

Mac OS 10.7 "Lion" and newer

Starting in 2011, Apple stopped bundling Java with the operating system. To download and install Java:

• Go to your Applications folder. Open the Utilities folder and double-click Java Preferences.
• If Java is not installed, you will receive the following message:
  "To open "Java Preferences," you need a Java runtime. Would you like to install one now?"
• Click Install and accept the license agreement. The Java runtime will be downloaded and installed.

Turning on Java (Internet Explorer)

Internet Explorer 4.x and Up

1. Click Tools --> Internet Options
   
2. Select the Advanced Tab, and scroll down to Java (Sun). Check the box next to Use JRE ... for <applet>. Your version number of JRE will likely be different than in the screen shot.
   
3. Next, select the Security Tab, and select the Custom Level button.
   
4. Scroll down to Scripting of Java applets. Make sure the "Enable" radio button is checked.
   
5. Click OK to save your preference.

Turning on Java (Firefox)

Firefox 1.0 and Up (screenshots are taken in Windows)

1. Select Tools -> Options.
   
2. Click the Content icon (in older versions this is called "Web Features").
   
3. Check the box labeled Enable Java.
4. If you do not see the search box right away, click the Reload button.
   

Turning on Java (Safari)

Safari

1. Click Safari -> Preferences...
   
2. In the Preferences window, click the Security tab.
   
3. Check the Enable Java checkbox.
4. Close the Preferences window to save your preference.
5. If you do not see the search box right away, click the Reload button or select View -> Reload Page.
   

Turning on Java (Konqueror)

Konqueror (screenshots are taken in KDE)

1. Click Settings -> Configure Konqueror...
   
2. In the Configure window, click the Java & JavaScript icon.
   
3. In the Java tab, check the Enable Java globally checkbox.
4. If you do not have Java in your path, click the folder icon next to "Path to Java executable, or 'java':" box and locate your Java installation.
   

If you have problems getting Java running through Konqueror, you can view Konqueror's Java page online.