1. (#10 on page 598) Create an abstract class called GeometricFigure. Each figure includes a height, a width, a figure type, and an area. Include an abstract method to determine the area of the figure. Create two subclasses called Square and Triangle. Create an application that demonstrates creating objects of both subclasses, and store them in an array. Save the files as GeometricFigure.java, Square.java, Triangle.java, and UseGeometric.java.
2. (#11 on page 598) Modify Exercise 10, adding an interface called SidedObject that contains a method called displaySides(); this method displays the number of sides the object possesses. Modify the GeometricFigure subclasses to include the use of the interface to display the number of sides of the figure. Create an application that demonstrates the use of both subclasses. Save the files as GeometricFigure2.java, Square2.java, Triangle2.
java, SidedObject.java, and UseGeometric2.java.Attachments