What is SwingWT?
SwingWT is a 100% pure Java library which very closely resembles the interface of Swing and AWT. The difference is that instead of using the Swing/AWT libraries, it drives native peer widgets from SWT.
This offers many benefits:
-More responsive GUIs and faster startup times
-Less RAM usage for applications
-Many developers prefer the Swing API
-Existing Swing applications don't need to be recoded
-Mature Swing UI designers can be used
-Developers deploying to *nix/Win32 can compile natively with GCJ and the applications can be distributed without a VM. Linux distribution makers could package many existing Java/Swing applications that previously could not be distributed in workable state.
-SWT components can be directly accessed through the API, allowing mix and match (make Eclipse plugins with Swing!)
-Use Swing on mobile devices!
-The best of both worlds! New Swing components for JClosableTabbedPane, JCoolBar..
AWT and Swing are JCP standards and officially part of the JDK for UI development. AWT is also available on all Java powered PDAs.
SWT is IBM's Java UI package. It is tightly integrated with the native OS and hence provides better performance and look-and-feel. But it is not as portable as AWT/Swing.
IBM produces a Java runtime on PDAs. They support SWT and on top of that, the standard AWT. I do not cover SWT since it is not universal and my book is not about the UI anyway.