How to get jdk installation directory programmatically?

when we install jdk, we can select a directory to install it, i.e.
F:\myfolder\jdk1401
this is not JRE directory and can not be got by java method System.getProperties()
my Q is:
how to get the directory progammatically in Java program?
thx

Most commercial software gives the user the oppotunity to specify the JDK they want to use. Some search for the JDK for them, but often involve a directory search. The registry trick should work, but you need to check the directory still exists. The user can move/delete it without the registry being updated, this is very easy if the drive is a network drive.
Note:
if the jdk is installed on a network drive, the registry may not be setup for each user. They can see it but it does not appear in the registry.
If you setting up a web server e.g. tomcat, it typically runs as a different login id to the user installing it. Network drives are different for different users, so network drive letters may not work. Using the UNC instead of the drive letter can get around this problem.
If the user tries to install his run anay where software on a non-windows system, there will be no registry.
Good Luck.

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[Code]
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