Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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FOR JAVA
1. Implement the following classes and interface in Java.
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Shape interface which has the following methods:
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– public double perimeter(); // doesn’t have any parameters, re- turns the perimeter of the shape.
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– public double area(); // doesn’t have any parameters, returns the area of the shape.
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– public void info(); // doesn’t have any parameters, prints the perimeter and area of the shape.
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Circle class that implements Shape interface and has a constructor that takes the radius.
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Rectangle class that implements the Shape interface and has a con- structor that takes the width and height.
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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.
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