I've got 9 buttons that are presented with one icon, and when I press that
button I want to change it, but
I've complicated a little bit... (hope, you'll understand what I need, if
not, I'll send whole code)

button initialization:

JButton[] button = new JButton[9];
{for ( int i = 0; i < 9; i++)
 button[i] = new JButton(paint[0]);}

putted 9 ActionListeners:

Container cp = getContentPane();
 cp.setLayout(new FlowLayout());
 for ( int i = 0; i < 9; i++)
  cp.add(button[i]);
 for ( int i = 0; i < 9; i++)
  button[i].addActionListener(new AL());

AL is a class that implements ActionListener,
also I've got 2 icons:

static Icon[] paint = {
 new ImageIcon(path + "icon1.gif"),
 new ImageIcon(path + "icon2.gif")};

i want each time I press a button to change from icon1 to icon2.
in actionPerformed method I followed yours advices and put
Object buttonSource = e.getSource();
but since my buttons are Array obj. I can't say:
buttonSource.setIcon(paint[1]);