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All of the preceding examples in this book have been Java console-based applications However, these types of applications constitute only one class of Java programs Another type of program is the applet As mentioned in 1, applets are small applications that are accessed on an Internet server, transported over the Internet, automatically installed, and run as part of a web document After an applet arrives on the client, it has limited access to resources so that it can produce a graphical user interface and run complex computations without introducing the risk of viruses or breaching data integrity
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13:
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I / O , A p p l e t s , a n d O t h e r To p i c s
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Many of the issues connected with the creation and use of applets are found in Part II, when the applet package is examined and also when Swing is described in Part III However, the fundamentals connected to the creation of an applet are presented here, because applets are not structured in the same way as the programs that have been used thus far As you will see, applets differ from console-based applications in several key areas Let s begin with the simple applet shown here:
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import javaawt*; import javaapplet*; public class SimpleApplet extends Applet { public void paint(Graphics g) { gdrawString("A Simple Applet", 20, 20); } }
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This applet begins with two import statements The first imports the Abstract Window Toolkit (AWT) classes Applets interact with the user (either directly or indirectly) through the AWT, not through the console-based I/O classes The AWT contains support for a window-based, graphical user interface As you might expect, the AWT is quite large and sophisticated, and a complete discussion of it consumes several chapters in Part II of this book Fortunately, this simple applet makes very limited use of the AWT (Applets can also use Swing to provide the graphical user interface, but this approach is described later in this book) The second import statement imports the applet package, which contains the class Applet Every applet that you create must be a subclass of Applet The next line in the program declares the class SimpleApplet This class must be declared as public, because it will be accessed by code that is outside the program Inside SimpleApplet, paint( ) is declared This method is defined by the AWT and must be overridden by the applet paint( ) is called each time that the applet must redisplay its output This situation can occur for several reasons For example, the window in which the applet is running can be overwritten by another window and then uncovered Or, the applet window can be minimized and then restored paint( ) is also called when the applet begins execution Whatever the cause, whenever the applet must redraw its output, paint( ) is called The paint( ) method has one parameter of type Graphics This parameter contains the graphics context, which describes the graphics environment in which the applet is running This context is used whenever output to the applet is required Inside paint( ) is a call to drawString( ), which is a member of the Graphics class This method outputs a string beginning at the specified X,Y location It has the following general form: void drawString(String message, int x, int y) Here, message is the string to be output beginning at x,y In a Java window, the upper-left corner is location 0,0 The call to drawString( ) in the applet causes the message A Simple Applet to be displayed beginning at location 20,20 Notice that the applet does not have a main( ) method Unlike Java programs, applets do not begin execution at main( ) In fact, most applets don t even have a main( ) method Instead, an applet begins execution when the name of its class is passed to an applet viewer or to a network browser
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Part I:
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