圆柱的面积，体积，半径

public class Fjava {

public static void main(String[] args)


{
Cylinder c=new Cylinder(2,3);
c.show();
c.showVolume();
}

}

public class Circle {
private double Radius;

public Circle()
{
this.Radius=0;
}

Circle(double r)
{
this.Radius=r;
}

double getArea()
{
return 2*Math.PI*Radius;
}

double getPerimeter()
{
return Math.PI*Radius*Radius;
}

void show()
{
System.out.println("半径为"+Radius+"  周长为"+getPerimeter()+"  面积为"+getArea());
}
}

public class Cylinder extends Circle{
private double high;
public Cylinder(double r,double h)
{
super(r);
this.high=h;
}

double getVolume()
{
return getArea()*high;
}

void showVolume()
{
System.out.println("圆柱体的体积为："+getVolume());
}
}