I want to install JDK 1.5 and 1.6 on XP, is it possible? how to do it
Also, I am using Eclipse how to setup using different JDK for different projects?
You may install different JDKs easily: just specify different folders.
You can setup the installed JDKs in Eclipse Window/Preferences/Installed JREs
You can pick the JDK and Java version for every single project in Project/Properties/Java Compiler