cylinder.txt

一个比较好的Java试验

/*
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 */

package testcylinder;

/**
 *
 * @author Administrator
 */
class Circle{
    private double radius;
    public Circle(){
        radius=1.0;
    }
    public Circle(double radius){
        this.radius=radius;
    }
    public void setRadius(double radius){
        this.radius=radius;
    }
    public double getRadius(){
        return radius*radius*Math.PI;
    }
}
class Cylinder extends Circle{
    private double length;
    public Cylinder(){
        setRadius(1.0);
        length=1.0;
    }
    public Cylinder(double radius,double length){
        super(radius);
        this.length=length;
    }
    public double getArea(){
        return getArea()*length;
    }
}
public class TestCylinder{

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here
        Cylinder a=new Cylinder();
        System.out.println("The volumn is:"+a.getArea());
    }

}