HDU-2002 计算球体积

import java.util.*;
import java.text.*;

public class Main {

public static void main(String[] args) {
Scanner cin = new Scanner(System.in);
Ball ball = new Ball();
while(cin.hasNext()) {
ball.setRadius(cin.nextDouble());
double ans = ball.volume();
NumberFormat layout = new DecimalFormat("0.000");
System.out.println(layout.format(ans));
}
cin.close();
}
}

class Ball {
private double radius;
public void setRadius(double radius) {
this.radius = radius;
}
public double getRadius() {
return radius;
}
public double volume() {
return 3.1415927 * Math.pow(radius, 3) * 4 / 3;
}
}