The Java class library includes a set of packages called Swing that enable Java programs to offer graphical user interfaces and collect user input with the mouse, keyboard, and other input devices.
Today, you will use Swing to create applications that feature each of these graphical user interface components:
Frames—. Windows that can include a title bar; menu bar; and Maximize, Minimize, and Close buttons
Containers—. Interface elements that can hold other components
Buttons—. Clickable regions with text or graphics indicating their purpose
Labels—. Text or graphics that provide information
Text fields and text areas—. Windows that accept keyboard input and allow text to be edited
Drop-down lists—. Groups of related items ...