Java中如何实现圆柱体表面积和体积的计算

package com.web;

import java.util.Scanner;

class Circle{
  public static final double PI=3.14;

  private double r;
  private double h;

  public Circle() {
    super();
  }

  public Circle(double r, double h) {
    super();
    this.r = r;
    this.h = h;
  }

  public double getR() {
    return r;
  }

  public void setR(double r) {
    this.r = r;
  }

  public double getH() {
    return h;
  }

  public void setH(Double h) {
    this.h = h;
  }

  public static double getPi() {
    return PI;
  }

  public double getArea(){
    return PI * r * r * 2 + h * 2 * PI * r;
  }

  public double getVolume(){
    return PI * r * r * h;
  }



}
public class CylinderTest {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    Circle c = new Circle();

    System.out.println("请输入圆的半径:");
    c.setR(sc.nextDouble());

    System.out.println("请输入圆柱的高:");
    c.setH(sc.nextDouble());

    System.out.printf("圆柱的面积为:"+ c.getArea());
    System.out.printf("圆柱的体积为:"+ c.getVolume());
  }

}