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This is a start. Doing a google search of "abstract class" vs interface
gives plenty of reading...
in java,you can only extends one class,it can be abstract.if you want
extends more class,use interface.that's it.
Like the others have mentioned you can implement more than one interface, but only inherit from one abstract class. An abstract class can provide some implementation.
P.S. don't be a loser an put up multiple posts, especially on something so easy to do a search on.