Programming Internet Email by David Wood

Each class name is followed by a description of the class’s purpose. This is followed by a synopsis. The first line of the synopsis shows its visibility modifier (public, private, or protected), its type (interface, abstract, class), and its name. This line may also show the class’s inheritance, if appropriate.

Public and protected methods in the class are also shown in the synopsis. Each method name is preceded by its visibility and the data type that it returns and followed by the type of data that it expects as arguments.