Question

用JAVA定义一个圆类，再定义高，衍生出圆锥类，能求圆的面积和圆锥体积，求大神写一下。菜鸟级别，

Answer 1

圆类

/**
* Created by Administrator on 2017-3-3.
*/
public class Circular {
private double r;
public double getAcreage()
{
return Math.PI*r*r;
}
}

圆锥

/**
* Created by Administrator on 2017-3-3.
*/
public class Cone {
private Circular circular;
private double height;
public double getVolume()
{
return circular.getAcreage()*height*(1/3);
}
}