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Applet is tightly integrated with the AWT because it extends three key AWT classes: Component Container Panel Applet s immediate superclass is Panel It defines a simple container that can hold components Panel is derived from Container, which is the superclass for all containers Container is derived from Component, which specifies those qualities that define an AWTbased component These include (among many other things) the ability to display and paint a window, and to receive events Thus, an Applet is both a component and a container for other components The JApplet class, which is used for Swing-based applets, is directly derived from Applet In general, most Swing components are derived from JComponent The only exceptions to this are the four top-level Swing containers, which include JApplet Thus, JApplet includes all of the features available to any other AWT-based component However, it adds support for Swing, including methods that access the various panes defined by Swing In Swing, components are not added to a top-level container directly Instead, they are added to the container s content pane, and JApplet handles this process (See 8 for an overview of Swing s component architecture and its various panes) To use an applet, it must be specified in an HTML file At the time of this writing, Sun recommends using the APPLET tag for this purpose, and this is the tag used by examples in this book The applet will be executed by a Java-enabled web browser when it encounters the APPLET tag For example, the following HTML executes an applet called MyApplet
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<applet code="MyApplet" width=200 height=60> </applet>
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When this tag is encountered, MyApplet is executed in a window that is 200 pixels wide and 60 pixels high For convenience, each applet example in this chapter includes the HTML necessary to execute the applet in a comment near the top of its source code Although applets are ultimately for use inside a browser, for testing purposes, you can execute an applet within an applet viewer, such as appletviewer, which is supplied with the JDK An applet viewer makes testing during development much easier and faster To use appletviewer to execute an applet, specify the name of a file that contains the APPLET tag that launches the applet Because each of the applet examples in this book contain the necessary APPLET tag in a comment, you can specify the name of the source file; appletviewer will find the tag and execute the applet
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All applets (whether based on Applet or JApplet) share the same general architecture and have the same life cycle Architecturally, applets resemble window-based, GUI programs This means that they are not organized like console-based programs Execution of an applet does not begin at main( ) Actually, few applets even have main( ) methods Instead, execution of an applet is started and controlled by its life cycle methods Output to an applet s window is not performed by Systemoutprintln( ) and you won t normally use a method like readLine( ) for input Instead, user interactions are handled by the various
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controls provided by AWT or Swing components, such as check boxes, lists, and buttons It is also possible to write output directly to an applet s window, but you will use a method such as drawString( ) rather than println( ) Applets are event-driven Here is how the process works An applet waits until an event occurs, such as the user clicking the mouse or selecting an item from a list The runtime system notifies the applet about the event by calling an event handler that has been provided by the applet Once this happens, the applet must take appropriate action and then quickly return This is a crucial point For the most part, an applet must not enter a mode of operation in which it maintains control for an extended period Instead, it must perform specific actions in response to events and then return control to the runtime system In those situations in which your applet needs to perform a repetitive task on its own (such as displaying a scrolling message across its window), you must start an additional thread of execution
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