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Java applets inherit significant functionality from the Applet or JApplet class, including the capabilities to communicate with the browser and present a graphical user interface (GUI) to the user.

http://docs.oracle.com/javase/tutorial/deployment/applet/subclass.html

 

The Applet class provides a framework for applet execution, defining methods that the system calls when milestones occur.

http://docs.oracle.com/javase/tutorial/deployment/applet/appletMethods.html