Java：计算球体积

import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc=new Scanner(System.in);
double r1,v;
while(sc.hasNextDouble()) {
r1=sc.nextDouble();
v=acreage(r1);
System.out.printf("%.3f\r\n",v);
}
}
    public static double acreage(double a) {
    double A;
    double PI=3.1415927;
    A=4*PI*Math.pow(a,3)/3;
return A;
    }
}