what happens if there are two or more different implementations of jre on same platform?

Question

I have two jre versions installed on my system (1.3 & 1.5) and i am trying to some java applet programs through internet explorer. All i wanted to know is that how will the web browser select which version of jre to use when the applet program is executed.

Answer 1

It will use the default version of Java.

To change this

1. Go to Control Panel > Java > Advanced > Default Java for Browsers and uncheck Microsoft Internet Explorer.
2. Go to C:\Program Files\Java\jre_version_you_need_to_use\bin, and run javacpl.exe. Go to Advanced > Default Java for Browsers and check Microsoft Internet Explorer.