![]() The ComponentUI subclass is referred to by various names in Swing's documentation-"the UI," "component UI," "UI delegate," and "look and feel delegate" are all used to identify the ComponentUI subclass. For example, every JList instance has a concrete implementation of ListUI ( ListUI extends ComponentUI). Swing's architecture enables multiple L&Fs by separating every component into two distinct classes: a JComponent subclass and a corresponding ComponentUI subclass. "Look" refers to the appearance of GUI widgets (more formally, JComponents) and "feel" refers to the way the widgets behave. ![]() The architecture of Swing is designed so that you may change the "look and feel" (L&F) of your application's GUI (seeĪ Swing Architecture Overview).
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