java 求圆的面积和圆柱体的体积

package com.hidata.devops.paas.demo;
/**
 * 圆
 */
public class Circle {
    protected double radius;//半径
    public Circle(double r){
        this.radius = r;
    }
    public double getArea(){
        return Math.PI * radius *radius;//获取面积
    }
}

package com.hidata.devops.paas.demo;
/**
 * 任务3、求圆的面积和圆柱体的体积
 */
public class Cylinder extends Circle{
    private double height;//高
    public Cylinder(double r,double h){
        super(r);
        this.height = h;
    }
    public double getVolume(){
        return super.getArea()*height;//圆柱体体积
    }
    public static void main(String[] args) {
        Cylinder cylinder = new Cylinder(5.0,10.0);
        System.out.println("圆的面积为：" + cylinder.getArea());
        System.out.println("圆柱体的体积为：" + cylinder.getVolume());
    }
}

圆的面积为：78.53981633974483
圆柱体的体积为：785.3981633974483
Process finished with exit code 0