package Chapter7;

public class CircleWithException {
 /** The radius of the circle */
 private double radius;

 /** The number of the objects created */
 private static int numberOfObjects = 0;

 /** Construct a circle with radius 1 */
 public CircleWithException() {
 this(1.0);
 }

 /** Construct a circle with a specified radius */
 public CircleWithException(double newRadius) {
 setRadius(newRadius);
 numberOfObjects++;
 }

 /** Return radius */
 public double getRadius() {
 return radius;
 }

 /** Set a new radius */
 public void setRadius(double newRadius)
 throws IllegalArgumentException {
 if (newRadius >= 0)
 radius = newRadius;
 else
 throw new IllegalArgumentException(
 "Radius cannot be negative");
 }

 /** Return numberOfObjects */
 public static int getNumberOfObjects() {
 return numberOfObjects;
 }

 /** Return the area of this circle */
 public double findArea() {
 return radius * radius * 3.14159;
 }
}