In the US, "GUI" is pronounced "gooey."
A graphical user interface consists of graphical components, such as:
Swing components are based on the fundamental classes of the Application Windowing Toolkit (AWT). The AWT also contains some older components which are no longer used. Swing components come with recent java Java releases. If you download the most recent release of Java, Swing will be part of it.
The older AWT components are similar to Swing components, but Swing components are more versatile. Also, Swing integrates smoothly with the Java Foundation Classes. The Java Foundation Classes provide many classes needed for modern software development. Sun Microsystems recommends that you use Swing for all new application code.
Is a button a GUI component?