public class Window extends JFrame implements ActionListener{

       public void actionPerformed(ActionEvent event) {
		String menuName;
		menuName= event.getActionCommand();
                 ....
                else if(menuName.equals("Set Zoom Factor")) {
			getMenuActionManager().setZoomFactorClicked();
		}
       }
}

public class MenuActionManager {
        public void setZoomFactorClicked() {
		DialogWindowDouble dialog = newDialogwindowDouble(getWindow(), "Title", "Question");
		double value = dialog.getValue();
	}
}

public class DialogWindowDouble extends DialogWindow{

         public double getValue() {
		while (!getOkPressed()) {			
		}
		changeOkPressed(false);
		String inputString = getInputField().getText();
		double inputDouble = Double.parseDouble(inputString);
		return inputDouble;		
	}
}

public class DialogWindow extends JDialog implements ActionListener{

         public void actionPerformed(ActionEvent event) {
		JButton clickedButton = (JButton) event.getSource();
		
		if(clickedButton == getOkButton()) {
			setOkPressed(true);			
		}
	}
}