You can generate Javadoc HTML documentation with Unified Modeling Language (UML) diagram images to provide more information about the source code.
For example, you can specify that the tool produces Javadoc HTML documentation for particular classes, shows the author of the code in a prominent way, and displays a simple UML diagram with some aspects of the inheritance hierarchy of the classes. Some of the usage relationships with other classes might help increase your understanding of the source code.
You can generate diagram images in the bitmap format (.bmp), the Graphic Interchange Format (.gif), or the Joint Photographic Experts Group format (.jpeg or .jpg).