1.?編程求矩形面積和圓面積，要求：（1）?分別編寫(xiě)矩形類(lèi)（屬性為寬和高）、圓類(lèi)（屬性為半徑）實(shí)現(xiàn)下面的接口：interface?CalcArea?{?????public?double?Area();}（2）?主類(lèi)的主方法中分別輸出一個(gè)矩形和一個(gè)圓的面積。?下面是我寫(xiě)是的代碼，但是好像不行，求大神指點(diǎn)哦。interface CalcArea{ public double Area();}class Rect implements CalcArea{? ? public double ?weight ,height; double ?s; s = weight*height;}System.out.print("矩形的面積為："+s);public class Test11 {}?class cicle implements CalcArea{?public double ?r; ??public ?double S; S = 3.14*r*r;}System.out.println("園形的面積為："+S);public class Test11 { public static void main(String args[]){ Rect rect = new Rect(); rect.Area(); Cicle cicle = new Cicle(); cicle.Area(); }}
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建議你還是多看看JAVA類(lèi)基礎(chǔ)吧
public?class?Rect?implements?CalcArea?{
????private?double?width;
????private?double?height;
????@Override
????public?double?Area()?{
????????//?TODO?自動(dòng)生成的方法存根
????????return?width?*?height;
????}
}--------------------------------------------
public?class?Test?{
????public?static?void?main(String[]?args)?{
????????//?TODO?自動(dòng)生成的方法存根
????????Rect?rect?=?new?Rect();
????????double?area?=?rect.Area();
????????System.out.println(area);
????}
}