e644. 处理Action事件

Action events are fired by subclasses of AbstractButton and includes buttons, checkboxes, and menus.

    AbstractButton button = new JButton("OK");
    button.addActionListener(new MyActionListener());

    public class MyActionListener implements ActionListener {
        public void actionPerformed(ActionEvent evt) {
            // Determine which abstract button fired the event.
            AbstractButton button = (AbstractButton)evt.getSource();
        }
    }

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