阅读程序并写出正确的运行结果class RectangleTest { double height; double width;RectangleTest (double w, double h){ width = w; height = h;} double area(.) { return width*height; }} class Rectangle{public static void main(String args[]){ double s;RectangleTest myRect= new RectangleTest(20, 30); s=myRect.area(.);System.out.println(" Rectang1e的面积是:"+s);}}运行结果为：（）