In the preceding section, you saw how you can specify complex shapes by constructing general paths that are composed of lines and curves. By using a sufficient number of lines and curves, you can draw essentially any shape. For example, the shapes of characters in the fonts that you see on the screen and on your printouts are all made up of lines and cubic curves.
Occasionally, it is easier to describe a shape by composing it from areas, such as rectangles, polygons, or ellipses. The Java 2D API supports four constructive area geometry operations that combine two areas to a new area:
add— The combined area contains all points that are in the first or the second area.
subtract— The combined area contains all points that are in the first ...