定義一個點->圓->圓錐體->雙圓錐體

code

package javahomework;

public class HW15 {

 class Point {
  private double x, y;

  public Point() {
   x = 1.0;
   y = 1.0;
  }

  public Point(double n1, double n2) {
   x = n1;
   y = n2;
  }

  public double getX() {
   return x;
  }

  public double getY() {
   return y;
  }
 }

 class Circle{
  private double r;
  private Point p;
  public double pi = 3.1415926;

  Circle() {
   r = 1.0;
  }

  public double findArea() {
   return r * r * pi;
  }

  public double findlength() {
   return r * pi * 2;
  }

  public void set(double n,Point p) {
   r = n;
  }

  public double get_r() {
   return r;
  }
  
  public Point get_Point(){
   return p;
  }
  
  public void set_Point(Point p){
   this.p = p;
  }
 }

 class Cone extends Circle {
  private double r = super.get_r();
  private double h;

  Cone() {
   h = 1.0;
  }

  Cone(double n1, double n2) {
   r = n1;
   h = n2;
  }

  public void set(double n1, double n2) {
   r = n1;
   h = n2;
  }

  public double getR() {
   return r;
  }

  public double getH() {
   return h;
  }

  public double findVolume() {
   return (pi * r * r * h) / 3;
  }

  public double findFaceArea() {
   return (Math.pow((r * r) + (h * h), 0.5)) * 2 * pi;
  }

 }

 class DouleCone extends Cone {
  private double r = super.getR();
  private double h = super.getH();

  public double findDoublejVolume() {
   return super.findVolume() * 2;
  }

  public double findDoubleH() {
   return h * 2;
  }

  public double findDoubleVolume() {
   return super.findVolume() * 2;
  }

  public double findDoubleFaceArea1() {// 漏斗
   return super.findFaceArea() * 2;
  }

  public double findDoubleFaceArea2() {// 兩邊尖
   return (super.findFaceArea() * 2) - (r * r * pi) * 2;
  }
 }
}