Simple.java

// Simple.java -- illustrate simple overriding of methods

class Point  {
   protected float x,y;
   Point (float x, float y) { this.x=x; this.y=y; }
   @Override
   public String toString () {
      return String.format ("(%.2f,%.2f)", x, y);
   }
}

class Rectangle extends Point {
   protected float height, width;
   Rectangle (float x, float y, float h, float w) {
      super (x,y); height=h; width=w;
   }
   @Override
   public String toString () {
      return String.format ("(%.2f,%.2f;h=%.2f,w=%.2f)", x, y, height, width);
   }
}

class Circle extends Point {
   protected float radius;
   Circle (float x, float y, float r) {
      super (x,y); radius=r;
   }
   @Override
   public String toString () {
      return String.format ("(%.2f,%.2f;r=%.2f)", x, y, radius);
   }
}

class Simple {
   public static void main (String [] args) {
      final Point p = new Point (2.3f, 4.5f);
      final Rectangle r = new Rectangle (2.3f, 4.5f, 45.1f, 89.1f);
      final Circle c = new Circle (2.3f, 4.5f, 0.3f);
      final Point [] list = new Point [] {p, r, c};
      for (Point q: list) System.out.println (q.toString());
      for (Point q: list) System.out.println (q);  // same effect
   }
}