Abstract Window Toolkit (AWT) is a collection of graphical user interface (GUI) components (widgets) and other related services required for GUI programming in Java. It is Java’s original platform-independent windowing, graphics and user-interface widget tool kit. AWT is now part of Java Foundation Classes (JFC) and serves as the standard application programming interface (API) for GUI programming in Java.

From J2SE1.2 forward, the AWT widgets were largely superseded by the Swing toolkit. Swing functionality relies on AWT for core interfacing to the native windowing system. However, the programmer now has the choice between the look and feel of the native system and the cross-platform look and feel of Java. Swing is preferred by most Java programmers who still adhere to the write once, run anywhere (WORA) principle at the core of Java’s philosophy.