[actionPerformed] ActionListenner, 액션리스너, actionPerformed

public class AAA extends JFrame implements ActionListener {

// 멤버 변수들...
// 멤버 함수들...

    @Override
    public void actionPerformed(ActionEvent e) {
　　    if ("확인".equals(e.getActionCommand())) { } // '확인' 버튼 누를 때
　　    if (e.getSource() == cancel ) { } // cancel 객체

    }
}