3.4. Creating your user interface
When you display some text to the user, provide a button for them to click, or animate a dialog box giving some information, you’re using a widget. When you want to display widgets in some form of structure, then you’re most likely going to be using a panel.
Definitions
A widget is a component of your web application with which the user may interact. A panel is a widget that can hold one or more other widgets in a specific visual/functional structure.
HelloWorld’s entry point gave perhaps the simplest example. It created a Label widget that’s able to hold some text and added it to a panel called RootPanel (that represents the web page).
Widgets and panels have some subtle differences between them, ...
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