I'm not sure if you mean "generic" as in a general discussion, or the generics language feature introduced in Java5. If you Google "Sun topic tutorial" you'll almost always find something good at Sun.
Let us know what new questions those tutorials raise.
A good question is never answered. It is not a bolt to be tightened into place but a seed to be planted and to bear more seed toward the hope of greening the landscape of the idea. John Ciardi