This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
instance methods can use both super and this , as both keywords meant to associated with instance.
"this" refers to current object.
"super" is used to call a method on the base class that has been overridden by Child.