Java示例方法覆盖

public class Findareas {

   public static void main (String []agrs) {

      Figure f = new Figure(10 , 10);

      Rectangle r = new Rectangle(9 , 5);

      Figure figref;

      figref = f;

      System.out.println("Area is :"+figref.area());

      figref = r;

      System.out.println("Area is :"+figref.area());

   }

}

class Figure {

   double dim1;

   double dim2;

   Figure(double a , double b) {

      dim1 = a;

      dim2 = b;

   }

   Double area() {

      System.out.println("Inside area for figure.");

      return(dim1*dim2);

   }

}

class Rectangle extends Figure {

   Rectangle(double a, double b) {

      super(a ,b);

   }

   Double area() {

      System.out.println("Inside area for rectangle.");

      return(dim1*dim2);

   }

}