Float/Double Classes

• Rectangle2D class has no instance variables
• Template Method Pattern at work:
  

  public boolean contains(double x, double y)
  {
     double x0 = getX();
     double y0 = getY();
     return x >= x0 && y >= y0 &&
        x < x0 + getWidth() &&
        y < y0 + getHeight();
  }
  

• No need to use inner class after construction
  Rectangle2D rect
     = new Rectangle2D.Double(5, 10, 20, 30);