op34b0f8140047.txt

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     * Marks this thread as either a daemon thread or a user thread. The 
     * Java Virtual Machine exits when the only threads running are all 
     * daemon threads. 
     * <p>
     * This method must be called before the thread is started. 
     *
     * @param      on   if <code>true</code>, marks this thread as a
     *                  daemon thread.
     * @exception  IllegalThreadStateException  if this thread is active.
     * @see        java.lang.Thread#isDaemon()
     * @since      JDK1.0