Type, compile, and run listing 9.1, page 326 (file TestCircle.java). Notice that this program has 2 classes in the same file (Class TestCircle and Class Circle). Understand how objects circle1, circle2, and circle3 are created and manipulated.

2. Now, type, compile, and run listing 9.2, page 328 (file Circle.java). Notice that the main method of this class is acting as the test class in listing 9.1. Next, make some changes to this class to create 2 more objects, say circle4 and circle5. Print out the radius and area of each circle object similar to other circle objects.

9.3 Example: Defining Classes and Creating Objec Classes are definitions for objects and objects are created from classes This section gives two examples of defining classes and uses the classes to creat Listing 9.1 is a program that defines the Circle class and uses it to create objects gram constructs three circle objects with radius 1, 25, and 125 and displays the r area of each of the three circles. It then changes the radius of the second object t displays its new radius and area. LISTING 9.1 TestCircle.java 1 public class TestCircle ( 2 3 public static void main(Stringt] args) f 4 5 /Main method /I Create a circle with radius 1 Circle circle1 new Circle(); System, out, println("The area of the circle of radius + circle1.radius+"is "circle1.getArea)); /I Create a circle with radius 25 System.out.println ("The area of the circle of radius" 7 10 Circle circle2 new Circle (25): + circle2.radius is" circle2.getArea()) /I Create a circle with radius 125 Circle circle3 = new Circle(125); System.out.println ("The area of the circle of radius " 12 16 +circle3.radius "is "+circle3.getArea()) /1 Modify circle radius circle2.radius = 100; // or circle2.setRadius (100) System.out.println("The area of the circle of radius " 19 20 21 + circle2.radiusis "+ circle2.getArea(); 23 24 25