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// date:17.3.27

// author: linyang <linyang@xiaomi.com>

public class Circle3 {

private double radius = 1;

private static int numberOfObjects = 0;

public Circle3 () {

numberOfObjects++;

}

public Circle3 (double newRadius) {

radius = newRadius;

numberOfObjects++;

}

public double getRadius() {

return radius;

}

public void setRadius(double newRadius) {

radius = (newRadius >= 0 ? newRadius : 0);

}

public static int getNumberOfObjects() {

return numberOfObjects;

}

public double getArea() {

return radius * radius * Math.PI;

}

}