package?com.t1; import?java.util.*; class?Circle?{ double?r; Circle(double?a){ r=a; }//構(gòu)造函數(shù)，將參數(shù)傳給r double?getArea(){ double?S=3.14*r*r; return?S; } //普通方法，計(jì)算圓面積 } class?Yuanzhu{ double?heigh; Circle?circle;//初始化對(duì)象 Yuanzhu(double?b){ heigh=b; } double?s=circle.getArea();//獲取Circle中的getArea計(jì)算出的底面積?????。?！運(yùn)行報(bào)錯(cuò) double?getVolue(){ double?v=s*heigh; return?v; }//計(jì)算體積 } public?class?Test{ public?static?void?main(String[]?args){ Scanner?input=new?Scanner(System.in); System.out.println("請(qǐng)輸入圓柱的底面半徑r"); double?x=input.nextDouble(); Circle?circle=new?Circle(x); System.out.println("請(qǐng)輸入圓柱的高h(yuǎn)"); double?y=input.nextDouble(); Yuanzhu?yuanzhu=new?Yuanzhu(y); double?S=circle.getArea(); double?V=yuanzhu.getVolue(); System.out.println("圓柱的底面積是"+S+"圓柱的體積是"+V); } }編譯時(shí)沒有出錯(cuò)，可是運(yùn)行時(shí)輸入半徑和高之后就出錯(cuò)了，這是怎么回事？求高手解答，謝謝~~