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Difference between abstract class and Interface
http://javasimplify.blogspot.com/2017/10/difference-between-abstract-class-and.html
3 Answers
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1) astract class contain abstract method or may not contain abstract method but object creation is not allowed.
2) if you declared at least one abstract method then you also include your class as abstract class..
3) abstract class content normal method also..
interface is pure abstract class, in here you cant declared object creation. but normal method is not allowed
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Can you remove the tag C please ? C has no abstract things :/