DiffJ is a commandline application that compares Java files based on
content, not whitespace, comments, or reordering of types, methods, or
fields. Its output is based on the Unix program diff, and it also has
a "brief" output format for a concise summary of what changed. It can
work on directories recursively, looking for matching filenames, like
"diff -r dir0 dir1". It is primarily for developers refactoring and
reformatting Java code, for which most difference tools tend to produce
misleading results regarding the type and extent of changes.
