How can I set the JDK NetBeans runs on?

Thanks to Kasun Gajasinghe's tip, I found the solution in the "suggested" link. Update the following file (replace 7.x with your NetBeans version):

C:\Program Files\NetBeans 7.x\etc\netbeans.conf

Change the following line to point it where your Java installation is:

netbeans_jdkhome="C:\Program Files\Java\jdk1.7xxxxx"

You may need administrator privileges to edit netbeans.conf.

Go to Tools* → Java Platforms. There, click on Add Platform and point it to C:\Program Files (x86)\Java\jdk1.6.0_25. You can either set the another JDK version or remove existing versions.

Another solution suggested on the Oracle (Sun) site is,

netbeans.exe --jdkhome "C:\Program Files\jdk1.6.0_20"

I tried this on 6.9.1. You may change the JDK per project as well. You need to set the available JDKs via the Java Platforms dialog. Then, go to Run → Set Project Configuration → Customize. After that, in the opened dialog box, go to menu Build → Compile. Set the version.