public double area(double r) {
   double area = 0;
  area=Math.PI*(r*r);
  return area;
 }
 public double area(double w,double h) {
  return w*h;
 }
 public static void main(String[] args) {
  Home1 area1=new Home1();
  Scanner sc=new Scanner(System.in);
  System.out.println("请输入圆的半径");
  double scn1=sc.nextDouble();
  System.out.println("请输入长方形的长");
  double scn2=sc.nextDouble();
  System.out.println("请输入长方形的宽");
  double scn3=sc.nextDouble();
  System.out.println("圆的面积为"+area1.area(scn1));
  System.out.println("长方形的面积为"+area1.area(scn2, scn3));
 }