Graphics.java

interface IShape {
  public void draw();
}

class Rectangle implements IShape {
  public void draw() {
    System.out.println("RECTANGLE");
  }
}

class Triangle implements IShape {
  public void draw() {
    System.out.println("TRIANGLE");
  }
}

class Graphics {
  public void render(IShape shapes[]) {
    for (IShape shape : shapes) {
      shape.draw(); // Polymorphic invocation to draw
    }
  }
}