Padrão de projeto Observer

public class ObserverSwing {
	
	private JFrame frame;

	ArrayList<ActionListener> arr= new ArrayList();
	
public void iniObserver(){
		frame = new JFrame();
		JButton b = new JButton("ola");
		
		ActionListener observer = new ActionListener(){
			
			public void actionPerformed(ActionEvent e){
				
				System.out.println("fui add "+1);	
				}
		};
		addAction(observer);
		addAction(new ActionListener(){
			
			public void actionPerformed(ActionEvent e){
				
				System.out.println("fui add "+2);	
				}
		});
		
		recupera(b);
		frame.getContentPane().add(b);
		frame.setVisible(true);
	}
	public void addAction(ActionListener a){
	
	arr.add(a);
	}
	public void recupera(JButton bu){
		for(ActionListener a: arr)
			bu.addActionListener(a);
	}
		public static void main(String[]args){
			new ObserverSwing().iniObserver();
		}
}