// A class providing a Queue viewer that lists the items of the queue.
// Barry Cornelius, 12th February 2000
import java.awt.    BorderLayout;
import javax.swing. JFrame;
import javax.swing. JScrollPane;
import javax.swing. JTextArea;
import java.util.   Observable;
import java.util.   Observer;
public class QueueLister implements Observer
{
   private JTextArea iJTextArea;
   public QueueLister(final int pJFrameX, final int pJFrameY)
   {
      final JFrame tJFrame = new JFrame("QueueLister");
      iJTextArea = new JTextArea("unused");
      final JScrollPane tJScrollPane = new JScrollPane(iJTextArea);
      tJFrame.getContentPane().add(tJScrollPane, BorderLayout.CENTER);
      tJFrame.setLocation(pJFrameX, pJFrameY);
      tJFrame.setSize(300,100);
      tJFrame.setVisible(true);
   }
   public void update(final Observable pObservable, final Object pObject)
   {
      final Queue tQueue = (Queue)pObservable;
      iJTextArea.setText(tQueue.toString().replace('@', '\n'));
   }
}