The spinner component is a single line input field that enables the user to select a number or a value by cycling through a sequence of values with a tiny pair of up/down arrow buttons.
The new formatted text field component allows formatting of dates, numbers, and strings, such as a text field that accepts only decimal currency values.
A new drag-and-drop architecture provides seamless drag-and-drop support between components as well as an easy way to implement drag-and-drop in your customized Swing components. You need only to write a couple of methods that describe the particulars of your data model.
The progress bar component has been enhanced to support an indeterminate state. Rather than showing the degree of completeness, the indeterminate progress bar uses constant animation to show that a time-consuming operation is occurring.
The tabbed pane component has been enhanced to support scrollable tabs. With this feature enabled, if all the tabs cannot fit within a single tab run, the tabbed pane component displays a single, scrollable run of tabs instead of wrapping the tabs onto multiple runs.
The popup and popup factory classes, which were previously package private, have been exposed and made public so that developers can customize or create their own popups.
The new focus architecture is fully integrated into Swing.
For more information, see http://java.sun.com/j2se/1.4/docs/guide/swing/SwingChanges.html.