(1) (10 points) this question is about working with abstract class in java program. create two classes (a and b) with a has an abstract method ( void call ( )) and b extends from a. class a has a concrete method calla ( ) that displays ""concrete method calla() in a"". b is a concrete class. your abstractdemo program should display the following:

hi

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hi, you. i think this we be deleted because it's a invalid question.

(i suggest no to do this in the

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