testpolymorphism.java

java的小程序

public class TestPolymorphism
{
  public static void main(String[] args)
  {
      GeometricObject geoObject1 = randCreateObject();
      GeometricObject geoObject2 = randCreateObject();

      System.out.println("The geoObject1 is a "+geoObject1.toString()+"object. And its area is "+geoObject1.findArea());
      System.out.println("The geoObject2 is a "+geoObject2.toString()+"object. And its area is "+geoObject2.findArea());      

  }
  public static GeometricObject randCreateObject()
  {
      switch((int)(Math.random()*2))
      {
         case 0: return new Circle(10);
         case 1: return new Rectangle(5, 3);
         default: ;
      }
      return null;
  } 
}