This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
If you want to provide some/common implementations for certain behaviors you may use abstract classes whereas interfaces (being 100% abstract) you force the implemented class to implement the behavior. You may find lots of information by searching through the forums (java) here. And find this Sun tutorial which would be helpful.