package com.t1;
import java.util.*;
class Circle {
double r;
Circle(double a){
r=a;
}//构造函数，将参数传给r
double getArea(){
double S=3.14*r*r;
return S;
}
//普通方法，计算圆面积
}
class Yuanzhu{
double heigh;
Circle circle;//初始化对象
Yuanzhu(double b){
heigh=b;
}
double s=circle.getArea();//获取Circle中的getArea计算出的底面积 ！！！运行报错
double getVolue(){
double v=s*heigh;
return v;
}//计算体积
}
public class Test{
public static void main(String[] args){
Scanner input=new Scanner(System.in);
System.out.println("请输入圆柱的底面半径r");
double x=input.nextDouble();
Circle circle=new Circle(x);
System.out.println("请输入圆柱的高h");
double y=input.nextDouble();
Yuanzhu yuanzhu=new Yuanzhu(y);
double S=circle.getArea();
double V=yuanzhu.getVolue();
System.out.println("圆柱的底面积是"+S+"圆柱的体积是"+V);
}
}编译时没有出错，可是运行时输入半径和高之后就出错了，这是怎么回事？求高手解答，谢谢~~
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