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A thread is a single sequential flow of control within a process.
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If a process has more than one thread, then each thread executes concurrently.
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Any Java applet which has extensive execution or loops to repaint the window must run as a concurrent thread with the browser window.
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To make an applet with a thread, which is almost always recommended:
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Change your applet definition to add "implements Runnable", the interface for threads.
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Include an instance variable for the thread of your applet.
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Have a start() method which creates a thread and starts it running and a stop() method which stops it running.
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Have a run() method containing the body of your applet code.
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