课后习题page101.pp3.6

//********************************************//  ball.java   Author: Jayson//*******************************************import java.util.Scanner;import java.text.DecimalFormat;public class ball {//---------------------------------------------//  input a radius of a ball, then calculate//  its surface are and volume//--------------------------------------------public static void main(String[] args){double radius, s, v;DecimalFormat fmt = new DecimalFormat("0.####");Scanner scan = new Scanner(System.in);System.out.println("Please input a radius of a ball");radius = scan.nextDouble();scan.close();v = (double)4 / 3 * Math.PI * Math.pow(radius , 3);s = 4 * Math.PI * Math.pow(radius , 2); System.out.println("The ball's volume is: " + fmt.format(v));System.out.println("The surface are of the ball is: " + fmt.format(s));}}