用java实现圆柱体体积

class Circle {
    private double radius;

    public Circle() {
    }

    public Circle(double radius) {
        this.radius = radius;
    }

    //求圆的面积
    public double getArea() {
        return 3.14 * radius * radius;
    }

    //求圆的周长
    public double getPerimeter() {
        return 2 * 3.14 * radius;
    }

    public void show() {
        System.out.printf("半径为：" + radius + "，周长为：" + getPerimeter() + ",面积为：" + getArea());
    }
}

public class Cylinder extends Circle {
    private double hight;

    public Cylinder(double radius, double hight) {
        super(radius);
        this.hight = hight;
    }

    //获取圆柱体的体积
    public double getVolume() {
        return getArea() * hight;
    }

    //将圆柱体的体积输出到屏幕
    public void showVolume() {
        System.out.println("圆柱体的体积为：" + getVolume());
    }
}

class Demo{
    public static void main(String[] args) {
        //创建一个圆柱体对象
        Cylinder cylinder = new Cylinder(10.0, 10.0);
        cylinder.showVolume();
        cylinder.show();
    }
}