shapetestwithpolymorphism.java

Java程序设计技巧与开发实例附书源代码。

public class ShapeTestWithPolymorphism
{
   public static void main(String args[])
   {
      Shape shapes[] =
          {
          new Rectangle(2, 4), new Circle(3),
          new Square(4), new RightTriangle(3, 4)};
      for (int i = 0; i < shapes.length; i++)
      {
         shapes[i].computeArea();
         shapes[i].computePerimeter();
         System.out.println(shapes[i]);
      }
   }
}