Description: Define abstract class Shape, abstract methods showArea (), find the area and showed that define the rectangle class Rectangle, square type Square, round classes Circle, according to their properties, obtained by the respective area showArea method, constructed in the main method three objects, method calls showArea
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Shape\Circle.class
.....\Rectangle.class
.....\Shape.class
.....\ShapeArea.class
.....\ShapeArea.java
.....\Square.class
Shape
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