java - 如何获得小数点后 4 位的输出答案

Question

我需要将输出四舍五入到小数点后 4 位，但我不太确定如何让我的东西完全按照我想要的方式运行，只需要将最后一位小数四舍五入到小数点后 4 位

import java.util.Scanner;  //Needed for the Scanner class  

public class SphereCalculations
{    
public static void main(String[] args)  //all the action happens here!    
{   Scanner input = new Scanner (System.in);

    double radius;
    double volume;
    double surfaceArea;

    System.out.println("Welcome to the Sphere Calculator. ");
    System.out.print( "Enter radius of sphere: " );
    radius = input.nextDouble();


    volume = ((4.0 / 3.0) * (Math.PI * Math.pow(radius, 3)));
    surfaceArea = 4 * (Math.PI * Math.pow(radius, 2));


    System.out.println("The Results are: ");
    System.out.println("Radius: " + radius);
    System.out.println("Sphere volume is: " + volume);
    System.out.println("Sphere Surface Area is: " + surfaceArea);
}
}

输出:

Radius: 7.5
Volume: 1767.1459
Surface Area: 706.8583

Answer 1

System.out.printf("Sphere Surface Area is: %.4f%n", surfaceArea);