package Chapter7;

public class TestCircle1 {
 /** Main method */
 public static void main(String[] args) {
 // Create a circle with radius 5.0
 Circle1 myCircle = new Circle1(5.0);
 System.out.println("The area of the circle of radius "
 + myCircle.radius + " is " + myCircle.getArea());

 // Create a circle with radius 1
 Circle1 yourCircle = new Circle1();
 System.out.println("The area of the circle of radius "
 + yourCircle.radius + " is " + yourCircle.getArea());

 // Modify circle radius
 yourCircle.radius = 100;
 System.out.println("The area of the circle of radius "
 + yourCircle.radius + " is " + yourCircle.getArea());
 }
}

// Define the circle class with two constructors
class Circle1 {
 double radius;

 /** Construct a circle with radius 1 */
 Circle1() {
 radius = 1.0;
 }

 /** Construct a circle with a specified radius */
 Circle1(double newRadius) {
 radius = newRadius;
 }

 /** Return the area of this circle */
 double getArea() {
 return radius * radius * Math.PI;
 }
}