package Chapter7;

public class Circle2 {
 /** The radius of the circle */
 double radius;

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

 /** Construct a circle with radius 1 */
 Circle2() {
 radius = 1.0;
 numberOfObjects++;
 }

 /** Construct a circle with a specified radius */
 Circle2(double newRadius) {
 radius = newRadius;
 numberOfObjects++;
 }

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

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