【每日日报】第十三天

1 今天写了以圆类设计球类

 题目要求：

 

 

 

 

 

 

 

  程序源代码：

 package Plane;

public class Point {
 double x;
    double y;
    Point()//无参构造
    {
      x=0;
      y=0;
         System.out.println("Point Constructor run");
 }
    Point(double xv,double yv)//有参构造
    {
   x=xv;
      y=yv;
      System.out.println("Point Constructor run");
  }
    Point(Point p)            //拷贝构造
    {
     x=p.x;
      y=p.y;
      System.out.println("Point CopyConstructor run");
    }
    void show()            //显示Point信息
    {
      System.out.print("("+x+","+y+")");
    }
   void setX(double xv){x=xv;}        //设置X坐标
   void setY(double yv){y=yv;}        //设置Y坐标
   double getX() {return x;}           //获取X坐标
   double getY() {return y;}           //获取Y坐标
}

 

package Plane;

public class Circle extends Plane{
 static double PI=3.14159;
 double radius;
 Circle()
 {
  super();
  radius=0;
     System.out.println("Circle Constructor run");
    }
 Circle(double xx,double yy,double rr)
   {
     super(xx,yy);
  radius=rr;
     System.out.println("Circle Constructor run");
   }
   Circle(Circle cir)
   {
  super(cir);
  radius=cir.radius;
        System.out.println("Circle CopyConstructor run");
   }
 void setR(double r){radius=r;}
    double getR() {return radius;}
 double length() {return 2*PI*radius;}        //用于计算圆的周长
    double area() {return PI*radius*radius;}            //用于计算圆的面积
    void show() {System.out.print("Circle(Point(X="+x+",Y="+y+"),Radius="+getR()+")");}
}

 

package Plane;

public class Sphere extends Circle{
 Sphere(){super();}
 Sphere(double xx,double yy,double rr)
    {
  super(xx,yy,rr);
        System.out.println("Sphere Constructor run");
    }
    Sphere(Sphere v)
    {
     super(v);
        System.out.println("Sphere CopyConstructor run");
    }
    void show()                     //用于显示球的信息
    {
        System.out.print("Sphere(");
        super.show();
        System.out.print(")");
    }
    double sArea()          //用于计算球的面积
    {
        double s;
        double r=getR();
        s=4*PI*r*r;
        return s;
    }
    double volume()          //用于计算球的体积
    {
        double v;
        double r=getR();
        v=4*PI*r*r*r/3;
        return v;
    }
}

 

package Plane;

import java.util.Scanner;

public class SolidMa extends Sphere{
 void show(Point p){/*点基类的显示函数*/
     p.show();
 }
 void length(Plane p){/*平面图形的周长函数*/
     System.out.print("Length="+p.length());
 }
 void area(Plane p){/*平面图形的面积函数*/
     System.out.print("Area="+p.area());
 }

 void volumn( Sphere s){/*立体图形的体积函数*/
     System.out.println("Volumn="+s.volume());
 }
 void s_Area(Sphere s){/*立体图形的表面积函数*/
  System.out.print("S_Area=");
  System.out.println(s.sArea());
 }
 public static void main(String[] args)
 {
  double  r;
     Scanner in=new Scanner(System.in);
     r=in.nextDouble();
     Sphere s1=new Sphere(1,2,3);
     Sphere s2=new Sphere(s1);
     SolidMa m=new SolidMa();
     m.show(s1);
     System.out.println();
     m.area(s1);
     m.length(s1);
     m.s_Area(s1);
     m.volumn(s1);
     s2.setR(r);
     m.show(s2);
     System.out.println();
     m.area(s2);
     m.length(s2);
     m.s_Area(s2);
     m.volumn(s2);
     in.close();
 }
}

  运行截图：

 

 

2 今天犯了一个低级的错误，局部变量没赋值

3 明天继续写题