java - "this" reference escaping during construction?

Question

If I do the following,

final class FooButton extends JButton{
    FooButton(){
        super("Foo");
        addActionListener(new ActionListener(){
            @Override
            public void actionPerformed(ActionEvent e){
                // do stuff
            }
        });
    }
}

am I letting the this reference implicitly escape?

Answer 1

Yes, the this reference escapes to the listener. Since this listener is not really an external class, I don't see any problem with it, though.

Here's where you could see that this escapes:

final class FooButton extends JButton{
    Foo(){
        super("Foo");
        addActionListener(new ActionListener(){
            private buttonText = FooButton.this.getText(); // empty string

            @Override
            public void actionPerformed(ActionEvent e){
                // do stuff
            }
        });
        this.setText("Hello");
    }
}