cylinder.java~1~

来自「Java实验报告」· JAVA~1~ 代码 · 共 64 行

package cylinder;
import java.io.*;
class Point{
  protected double x,y;
  public Point(){
    x=0;
    y=0;
  }
  public Point(double x,double y){
    this.x=x;
    this.y=y;
  }
  public double getPointX() {
    return x;
  }
  public double getPointY(){
    return y;
  }
}
class Circle extends Point{
  protected  double r;
  protected   final double PI=3.14;
  public Circle(){
    super();
    r=0;
  }
  public Circle(double x,double y,double r){
    super(x,y);
    this.r=r;
  }
  public double getR(){
    return r;
  }
  public double getmianji(){
    return PI*r*r;
  }
}
class Cylinder extends Circle{
  protected double h;
  Cylinder(){
    super();
      h=0;
  }
  Cylinder(double x,double y,double r,double h){
    super(x, y,r);
    this.h=h;
  }
  public double getTiji(){
    return PI*r*r*h;
  }
  double getH(){
     return h;
  }

  public static void main(String [] args) throws Exception{
     Cylinder a=new Cylinder();
     System.out.println("圆柱的轴心坐标：("+a.getPointX() +","+a.getPointY()+")");
     System.out.println("圆柱的半径"+a.getR());
     System.out.println("圆柱的高"+a.getH());
     System.out.println("圆柱的底面积："+a.getmianji());
     System.out.println("圆柱的体积："+a.getTiji());
  }
}