}
// Entry point for the thread that runs the banner.
public void run() {
char ch;
// Display banner
for( ; ; ) {
try {
repaint();
Thread.sleep(250);
ch = msg.charAt(0);
msg = msg.substring(1, msg.length());
msg += ch;
if(stopFlag)
break;
} catch(InterruptedException e) {}
}
}
// Pause the banner.
public void stop() {
stopFlag = true;
t = null;
}
// Display the banner.
public void paint(Graphics g) {
g.drawString(msg, 50, 30);
}
}
Following is sample output:
Let's take a close look at how this applet operates. First, notice that SimpleBanner
extends Applet, as expected, but it also implements Runnable. This is necessary, since the
applet will be creating a second thread of execution that will be used to scroll the banner.
Inside init( ), the foreground and background colors of the applet are set.
After initialization, the run-time system calls start( ) to start the applet running. Inside
start( ), a new thread of execution is created and assigned to the Thread variable t. Then, the
boolean variable stopFlag, which controls the execution of the applet, is set to false. Next,
the thread is started by a call to t.start( ). Remember that t.start( ) calls a method defined by
Thread, which causes run( ) to begin executing. It does not cause a call to the version of
start( ) defined by Applet. These are two separate methods.
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