Intro : Swing GUI Toolkit

Introduction
Swing is a Graphical User Interface (GUI) API, offering a set of components that can be used to build rich desktop interfaces. This includes basic elements such as windows, buttons, scrollbars, etc., as well as more complex compound objects such as file choosers, color choosers and combo boxes.

Architecture
Swing components are Java Beans, and are built around the Model-View-Controller (MVC) programming paradigm. This paradigm separates an application's business logic from its user interface so that they can be evolved independently.

JComponent is the core Controller class which coordinates Models and Views to display a final user component. All Swing components are inherited from JComponent. Note that components can have different views represented by different UIs...

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Courtesy:- Openjdk.java.net