Problem With Booleans and Threads

Question

Since using the .stop() and .resume() properties of a thread are dangerous, I resorted to using Booleans....
I can get it to stop just fine by setting "keepGoing" to false. That works...
But when I set the boolean to true... nothing happens. I think the while loop is broken when I set it to false and can't be fixed when the boolean is set back to true.
There's some deep process I'm not getting with while loops and/or threads.
Thanks for any help. The first segment of code is what's wrong. Post if it would help to see the rest.
class startUpdatingThread extends Thread {
      public void run() {
          System.out.println("THREAD STARTING TO RUN!");
        while (keepGoing == true) {
            if (keepGoing == true) {
            Long nextGoAbout = imgTime + 5000;//five seconds more
            if ( ((nextGoAbout - connection.getDate()) < 10000) ) {
                getnewPicture();
                imgCanvas.repaint();
}

Answer 1

Still a missing }, and you'll still fall out the end of the thread. Something like this:
class StartUpdatingThread extends Thread
     private volatile boolean     keepGoing = true;
     public void run()
          System.out.println("THREAD STARTING TO RUN!");
          for (;;)
               synchronized (this)
                    while (!keepGoing)
                         try
                              this.wait();
                         catch (InterruptedException exc)
               Long nextGoAbout = imgTime + 5000;//five seconds more
               if ( ( (nextGoAbout - connection.getDate()) < 10000) )
                    getnewPicture();
                    imgCanvas.repaint();
     public void pause()
          this.keepGoing = false;
     public synchronized void unpause()
          this.keepGoing = true;
          notifyAll();
}//<--end of StartUpdatingThread()