This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
Abstract class can have both abstract methods and non abstract methods. Interface methods are implicitly "public abstract". Abstract class can have non static variables. Interface variables are implicitly "public final static".
Depending on the above inforamtion you can choose which suits best for your application and implement it.