Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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1. Implement the following classes and interface in Java.
• Shape interface which has the following methods:
– public double perimeter(); // doesn’t have any parameters, returns the perimeter of the shape.
– public double area(); // doesn’t have any parameters, returns
the area of the shape.
– public void info(); // doesn’t have any parameters, prints the
perimeter and area of the shape.
• Circle class that implements Shape interface and has a constructor
that takes the radius.
• Rectangle class that implements the Shape interface and has a constructor that takes the width and height.
• Square class that extends the Rectangle class and has a constructor
that takes the edge length.
– Square constructor should only call the super constructor with
correct parameters.
– Square constructor should not explicitly implement the Shape
class, but it should inherit the perimeter, area and info methods
from the Rectangle class.
2. Create a Test class, and create one Circle, one Rectangle and one Square
objects. Call their info method in main method

PS: Could you please explain the program with comments?

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