import java.awt.*;
    import java.awt.event.*;
    import
   
    class MyApp implements ActionListener, Serializable
    {
        BigObjectThatShouldNotBeSerializedWithAButton bigOne;
        Button aButton = new Button();
      
        MyApp()
        {
            // Oops, now aButton has a listener with a reference
            // to bigOne!
            aButton.addActionListener(this);
        }
   
        public void actionPerformed(ActionEvent e)
        {
            System.out.println("Hello There");
        }
    }
jdk文档的这段实例代码，在添加事件监听器里，用了this关键字，这是则么传递的，是this的哪个用法，是调用构造函数还是作为参数传递?