package Interface;
import javax.swing.JOptionPane;
public class Circle implements Area,Perimeter,Volume
{
double r;
double h;
Circle()
{
this(3,10);
}
Circle(double r,double h)
{
this.h=h;
this.r=r;
}
public static void main(String[] args)
{
String str1=JOptionPane.showInputDialog("Please enter the radius of the circle:");
double r=Double.parseDouble(str1 );
String str2=JOptionPane.showInputDialog("Please enter the height of the cylinder:");
double h=Double.parseDouble(str2);
Area Circle=new Circle(r,h);
JOptionPane.showMessageDialog(null,"Circle Radius: "+r);
JOptionPane.showMessageDialog(null,"Area of the circle:"+Circle.area());
Volume Circle1=new Ciecle(r,h);
JOptionPane.showMessageDialog(null,"Volume of the cylinder: "+Circle1.volume());
Perimeter Circle2=new Ciecle(r,h);
JOptionPane.showMessageDialog(null,"圆的周长："+Circle2.perimeter());
}
public double area(){
return Math.PI*r*r;
}
public double perimeter(){
return 2*Math.PI*r;
}
public double volume() {
return this.area()*this.h;
}
}
面积接口
package Interface;
public interface Area {
public abstract double area();
}
周长接口
package Interface;
public interface Perimeter {
public abstract double perimeter();
}
The volume interface of the cylinder
package Interface;
public interface Volume
{
public abstract double volume();
}