Pluggable look and feel
Swing allows an application to specialize the look and feel of widgets by modifying the default (via runtime parameters), deriving from an existing one, by creating one from scratch, or, beginning with J2SE 5.0, by using the skinnable synth look and feel, which is configured with an XML property file. The look and feel can be changed at runtime.
The corresponding API includes:
- Hooks in Swing widgets to interact with their look and feel. Each widget defined in Swing can delegate its "painting" to its associated user interface classes called UI delegates.
- An API to manage existing look-and-feel definitions. This API allow to set the look and feel or switch from look and feels at runtime.
- Another API to define a specific look and feel, or derive a look and feel from an existing one.
Examples of look and feels 
Platform look and feels 
- A default cross-platform look and feel, called Metal (see
MetalLookAndFeel). This look and feel comes with several themes:
- Other cross-platform look and feels:
- Platform-dependent look and feels: Look and feels that aim to be the closest as possible to the platform native GUI. The fidelity to the native look-and-feel theming has been improved in recent Java versions by leveraging the platform native GUI theming library when possible
Third-party look and feels 
Numerous other look and feels have been developed by third parties, such as:
- Insubstantial, a maintenance fork of Substance
- JGoodies Windows and plastic look and feels.
- Liquid, which aim to look like the Liquid theme for KDE,
- Napkin, which can be used to make GUI work look provisional,
- Pienoware L&F with redesigned filechooser.
- Substance, a skinnable look and feel,
- Synthetica, which is based on synth,
See also 
- "Java Tutorials: Available Look and Feels". Sun Microsystems. 2008-02-14. Retrieved 2008-05-25.
- Potts, Jasper (2007-12-07). "Nimbus Category". Retrieved 2008-05-25.
- "Nimbus". Sun Microsystems. Archived from the original on 2008-05-13. Retrieved 2008-05-25.
- "Available Look and Feels". Sun Microsystems. Retrieved 2008-05-25.
- "GTK Native L&F Fidelity". Sun Microsystems. Retrieved 2008-05-25.
- "XP L&F does not work on Windows Vista (Longhorn) - needs to use uxtheme api". Sun Microsystems. Retrieved 2008-05-25.