Java: GUI aktualisiert nicht

// .....
boolean bStopped = false;
do {
	bStopped = Calculation.new_calculate(); // Calculation and display the result
	SwingUtilities.invokeLater(new MyDelay());
} while (!bStopped); //  

// .....

class MyDelay extends SwingWorker {

	@Override
	protected Object doInBackground() throws Exception {
		try {
    		      TimeUnit.SECONDS.sleep(5);
    	        } catch (InterruptedException e) {
    		     e.printStackTrace();
    	        }
	  return null;
	}
}