public class SamplePanel extends JPanel {
  private JButton button;
  private ArrayList buttons = new ArrayList();

  public Sample() {
    for (int i = 0; i < 10; i++) {
      button = new Button("button");
      button.addMouseListener(...);
      buttons.add(button);
    }
    /*
      for (int i = 0; i < 10; i++) {
        button = new Button("button");
        buttons.add(button);
      }
      for (int i =0; i < buttons.size(); i++) {
        ((JButton)buttons.get(i)).addMouseListener(...);
      }
    */
  }
}