This week's book giveaway is in the OCMJEA forum. We're giving away four copies of OCM Java EE 6 Enterprise Architect Exam Guide and have Paul Allen & Joseph Bambara on-line! See this thread for details.
1) If an abstract class has more than one abstract method, when a subclass extends that class, does the sub class has to implement all the abstract methods? Can I extend an abstract class and not implement any abstract method?
2) If I implement an interface in my class, can I override a method in the interface? If I can, is there anyway I can get the original method implementation in my overriding class. Like the use of "super" in class methods to refer to the super class method?
I can help you out on the first question and that is you have to implement all the abstract methods from the abstract class if you are in the first concrete class otherwise if you have an abstract class extending another abstract class then the first concret class must implement all the abstract methods.
Joined: May 05, 2005
For the second question - if you implement an interface you must override the methods in the interface anyway.