These packages implement an editor with syntax highlighting, parenthesis matching, automatic indentation, and line numbers. It is a programmer's editor in three ways.

• The actual application is a passable editor for programming, including most of the important features. But really, that's not the point.

• The classes serve as a useful library for programs that need a text editor as an important component. Configuring it to work with other languages requires little more than writing a new file for JFlex describing the tokens in that language with regular expressions.

• The code itself is open and thoroughly documented, usefully illustrating how to implement the features.

The code depends fairly heavily on Java 1.5, particularly its generics.