Shell Class Display Class Local Library (NATIVE LIBRARY)
Native Library: Responsible for dealing with your local operating system;
DISPLAY: The upper layer shell is interface with the underlying communication. One of its main functions is to translate translate between local operating system events (such as mouse click, etc.) and SWT events;
Shell: The top-level window of the app, all GUIs in the app are built on the shell; in the shell, the control (Control, such as buttons, text boxes, etc.) and component composite are included.
