Example4_9

class Circle
{
double radius;
Circle(double r){
radius=r;
}
double computerArea(){
return 3.14*radius*radius;
}
void setRadius(double newRadius){
radius=newRadius;
}
double getRadius(){
return radius;
}
}
class Cone{
Circle bottom;
double height;
Cone(Circle c,double h){
bottom=c;
height=h;
}
double computerVolume(){
double volume;
volume=bottom.computerArea()*height/3.0;
return volume;
}
void setBottomRadius(double r){
bottom.setRadius(r);
}
double getBottomRadius(){
return bottom.getRadius();
}
}
public class Example4_9{
public static void main(String args[]){
Circle circle=new Circle(8);
Cone circular=new Cone(circle,18);
System.out.println("circle的bottom半径:"+circular.getBottomRadius());
System.out.println("circle的体积:"+circular.computerVolume());
circular.setBottomRadius(88);
System.out.println("circular的bottom半径:"+circular.getBottomRadius());
System.out.println("circular的体积:"+circular.computerVolume());
}

}