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public MyDialogs {
  public static final int NEGATIVE = 0;
  public static final int POSITIVE = 1;
  private static final int UNSET = -1;

  private static Object sem = new Object();

  public static int showConfirmDialog(String message) {
    JFrame frame = new JFrame("Continue?");
    JButton ok = new JButton("Ok");
    JButton cancel = new JButton("Cancel");

    int retValue = UNSET;

    ok.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent arg0) {
        retValue = POSITIVE;
        sem.notify();
      }
    }

    cancel.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent arg0) {
        retValue = NEGATIVE;
        sem.notify();
      }
    }

    frame.add(new JLable(message));
    frame.add(ok);
    frame.add(cancel);

    frame.setVisible(true);

    while(retValue == UNSET) {
      sem.wait();
    }
    return retValue;
  }
}