Using Objects - Java Concepts - page 90

To draw an ellipse, you specify its bounding box (see Figure 23 ) in the same way that
you would specify a rectangle, namely by the x- and y-coordinates of the top-left
corner and the width and height of the box.

However, there is no simple Ellipse class that you can use. Instead, you must use
one of the two classes Ellipse2D.Float and Ellipse2D.Double , depending
on whether you want to store the ellipse coordinates as single- or double-precision
floating-point values. Because the latter are more convenient to use in Java, we will
always use the Ellipse2D.Double class. Here is how you construct an ellipse:

65
66

Figure 23

An Ellipse and Its Bounding Box

Ellipse2D.Double ellipse = new Ellipse2D.Double(x, y,
width, height);

The class name Ellipse2D.Double looks different from the class names that you
have encountered up to now. It consists of two class names Ellipse2D and Double
separated by a period ( . ). This indicates that Ellipse2D.Double is a so-called
inner class inside Ellipse2D . When constructing and using ellipses, you don't
actually need to worry about the fact that Ellipse2D.Double is an inner classȌ
just think of it as a class with a long name. However, in the import statement at the
top of your program, you must be careful that you import only the outer class: