Class Loaders

Can some one help me with

1) What class Loaders are/Primodial class loader?

2)Why and when we use them?

3)How to define our Own class loaders and how to implement them in coding?

I can see some links on it but i don understand them.I think it will be Usefull to post it here.

Plss feel free to recommed me some links even.

[359 byte] By [ganeshramhere] at [2007-9-30 19:16:03]