Applets are small applications that are accessed from web server automatically installed, and run from the browser. Once an applet arrives on the client it has limited access to resources thus ensuring security for the end user. An applet is controlled by the software that runs it. Usually, the underlying software is a browser, but it can also be applet viewer. If you run the applet source code from eclipse it runs inside an applet viewer. All applets should inherit from applet class.

Below are sequences of events which occur in applet:

The init Method: The init method is called when the applet is first loaded. Init method can be used to initialize color, fonts or any type of one type operation needed for the applet.
The start Method: The start method is called when user visits a browser with an applet on it. In start method applet spawns a thread in which it runs the paint method.
paint() is called every time when applet has to re-display everything.