以圆类 Circle 及立体图形类 Solid 为基础设计圆锥类 Cone

学习内容：以圆类 Circle 及立体图形类 Solid 为基础设计圆锥类 Cone

代码示例：

import java.util.Scanner;
class Point4{
  private double x;
  private double y;
  public Point4(double x,double y) {
    this.x=x;
    this.y=y;
    System.out.println("Point Constructor run");
  }
  public void setX(double x) {//设置x坐标
    this.x=x;
  }
  public double getX(){//返回x坐标
    return x;
  }
  public void setY(double y) {//设置y坐标
    this.y=y;
  }
  public double getY(){//返回y坐标
    return y;
  }
  public void show() {//显示点的坐标
    System.out.println("Point(X="+x+",Y="+y+")");
  }
}
abstract class Plane4 extends Point4{
  public Plane4(double x, double y) {
    super(x, y);
  }
  double length() {
    return 0;
  }
  double area() {
    return 0;
  }
}
class Circle2 extends Plane2 {  public Circle2(double x, double y,double radius) {
    super(x,y);
    this.x=x;
    this.y=y;
    this.radius=radius;
    System.out.println("Circle Constructorrun");
  } private double x;
  private double y;
  final double PI=3.14159;
  private double radius;
  public void setX(double x) {//设置x坐标
    this.x=x;
  }
  public final double getX(){//返回x坐标
    return x;
  }
  public void setY(double y) {//设置y坐标
    this.y=y;
  }
  public final double getY(){//返回y坐标
    return y;
  }
  public void setR(double r) {
    radius=r;
  }
  public final double getR() {
    return radius;
  }
  public final void show() {
    System.out.println("Circle(Point("+x+","+y+"),Radius="+radius+")");
  }
  public final double area() {
    double area=PI*radius*radius;
    System.out.println("Area="+area);
    return 0;
  }
  public final double length() {
    double length=2*PI*radius;
    System.out.println("Length="+length);
    return 0;
  }
}
abstract class Solid1 extends Circle{
  private double x;
  private double y;
  private double radius;
  public Solid1(double x, double y, double radius) {
    super(x, y, radius);
    this.x=x;
    this.y=y;
    this.radius=radius;
  }
  public double volume() {//计算体积
    return 0;
  }
  public double s_Area() {//计算表面积
    return 0;
  }
}
public class Cone extends Solid1{ private double x;
  private double y;
  private double radius;
  private double height;
  public void setX(double x) {//设置x坐标
    this.x=x;
  }
  public void setY(double y) {//设置y坐标
    this.y=y;
  }
  public void setR(double r) {
    radius=r;
  }
  public void setH(double height) {
    this.height=height;
  }
  public double getH() {
    return height;
  }
  public Cone(double x, double y, double radius,double height) {
    super(x, y, radius);
    this.x=x;
    this.y=y;
    this.radius=radius;
    this.height=height;
    System.out.println("Cone Constructorrun");
  }
  public final void show() {
    System.out.println("Cone(Circle(Point("+x+","+y+"),Radius="+radius+"),Height="+height+")");
  }
  public final double s_Area() {
    double l=Math.sqrt(radius*radius+height*height);
    double sarea=PI*radius*(radius+l);
    System.out.println("s_Area="+sarea);
    return 0;
  }
  public final double volume() {
    double volume=(1.0/3.0)*PI*radius*radius*height;
    System.out.println("Volume="+volume);
    return 0;
  } public static void main(String[] args) {
    double h; 
    System.out.println("请输入h：");
    Scanner sc=new Scanner(System.in);
    h=sc.nextDouble();
    Cone co1=new Cone(1,2,3,4);
    Cone co2=co1;
    co1.show();
    System.out.println();
    co1.area();
    co1.length();
    co1.s_Area();
    co1.volume();
    System.out.println("............................................................................................");
    co2.setH(h);
    co2.show();
    System.out.println();
    co2.area();
    co2.length();
    co2.s_Area();
    co2.volume(); }
}

运行截图：