Changes

| [[File:5bb.png|left|600px]] || [http://usThis class extends the UiApplication class, providing a graphical user interface.blackberry.com/developers/javaappdev/javaplugin.jsp BlackBerry Java Plug-in for Eclipse]

| [[File:6bb.png|left|600px]] || Goals of the Application[http://www.blackberry.com/developers/docs/6.0.0api/net/rim/device/api/ui/UiApplication.html UiApplication] Base class for all device applications that provide a user interface. * run the A UI application by adding it to the event dispatcher* create maintains a stack of Screen and push objects. As it pushes screens onto the Screen stack* specify , it draws them on top of any other screens already on the stack. When the title of application pops a Screen* display text screen off the stack, it redraws the underlying screens as necessary. Only the screen on the screen using a RichTextFieldtop of the stack receives input events. * Each screen may appear only once in the display stack. The application throws a runtime exception if you attempt to push a dialog box when the user closes single screen onto the stack more than once. Note that a UI applicationmust follow rules similar to those of traditional Swing applications.