OnJava8-Examples/polymorphism/Shapes.java

// polymorphism/Shapes.java
// (c)2016 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://mindviewinc.com/Books/OnJava/ for more book information.
// Polymorphism in Java.
import polymorphism.shape.*;

public class Shapes {
  private static RandomShapeGenerator gen =
    new RandomShapeGenerator();
  public static void main(String[] args) {
    Shape[] s = new Shape[9];
    // Fill up the array with shapes:
    for(int i = 0; i < s.length; i++)
      s[i] = gen.get();
    // Make polymorphic method calls:
    for(Shape shp : s)
      shp.draw();
  }
}
/* Output:
Triangle.draw()
Triangle.draw()
Square.draw()
Triangle.draw()
Square.draw()
Triangle.draw()
Square.draw()
Triangle.draw()
Circle.draw()
*/