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Possible Duplicate:
Interface vs Abstract Class (general OO)
When to use abstract class or interface?
Can you provided implementations on a abstract class?
what's the difference between these two?
and when will I know when will I know to use them?
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Interfaceis used for defining a contract. Abstract classes are used for defining some methods which are common to all descendants and possibly some methods which will differ(they will beabstract). Withinterfacesorabstract classespolymorphism is reached.This pages gives a good comparison: http://download.oracle.com/javase/tutorial/java/IandI/abstract.html . You could have found it with a very quick google search.