Jalopy is a source code formatter for the Sun Java programming language. It layouts any valid Java source code according to some widely configurable rules that meets a certain coding style without putting a formatting burden on individual developers.

Features include:

• Distributed settings support
• Easy switching between several code conventions
• Several pre-configured brace styles (C, Sun, GNU), but fully user-configurable
• Auto-insertion/removal of obsolete braces
• Special empty braces handling
• Wide range of whitespace options for method declarations/calls, brackets, parentheses, operators, delimeters...
• Prepending of leading whitespace before every line
• Powerful indentation/alignment capabilities
• Configurable line wrapping
• Controlable amount of blank lines between certain sections, blocks, statements...
• Comment removal for all sorts of comments
• Special comments to prohibit formatting for certain pieces of code (uses the Jindent syntax to retain backward compatibility)
• Auto-insertion of missing Javadoc comments (selectively configurable for the different access levels) with variable interpolation
• Auto-removal/insertion/correction of obsolete/missing/wrong Javadoc standard tags
• Auto-insertion of parentheses around expressions to make operator precedence obvious
• Auto-insertion of a serial version UID for serializable classes
• Sorting of class/interface/variable/constructor/method declarations
• Sorting of access modifiers
• Insertion of separation comments between class/interface/variable/constructor/method declarations
• Insertion of custom header/footer templates at the begin/end of every file (with variable interpolation)
• Sorting/grouping of import declarations
• Import optimization: expansion of on-demand import declarations to several single-type declarations (and vice versa). As of today only implemented for the Ant and JBuilder Plug-in
• Configurable message output
• Numbered backups (1-30)
• Multi-processor support
• Client API to make integration with other tools easy
• Graphical application to customize the settings (with live-preview)
• Powerful command line interface with regular expression filtering (Console Plug-in)
• Several Plug-ins to integrate with common Java applications (current set includes Ant, Eclipse, JBuilder, JDeveloper, jEdit and NetBeans/Sun ONE Studio)