问java swing事件

EN

    JButton button = new JButton("Button1");
    button.addActionListener(new ActionListener() {

        @Override
        public void actionPerformed(ActionEvent e) {
        System.out.println("Button1 was Clicked!");

        }
    });

    // add button to a container

JComponent button = new JButton();
component.addMouseListener(new MouseAdapter() {
    @Override
    public void mouseEntered(MouseEvent e) {
        System.out.println("Mouse entered the button");
    }
});