Java添加事件的四种方式

Java添加事件的几种方式（转载了codebrother的文章，做了稍微的改动）

/**
 * Java事件监听处理——自身类实现ActionListener接口，作为事件监听器
 *
 * @author codebrother
 */
class EventListener1 extends JFrame implements ActionListener {
    private JButton btBlue, btDialog;

    public EventListener1() {
        setTitle("Java GUI 事件监听处理");
        setBounds(100, 100, 500, 350);
        setLayout(new FlowLayout());
        btBlue = new JButton("蓝色");      
        btDialog = new JButton("弹窗");
        
        // 将按钮添加事件监听器
        btBlue.addActionListener(this);
        btDialog.addActionListener(this);

        add(btBlue);
        add(btDialog);

        setVisible(true);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
    // ***************************事件处理***************************
    @Override
    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == btBlue) {
            Container c = getContentPane();
            c.setBackground(Color.BLUE);
         }
        else if (e.getSource() == btDialog) {
            JDialog dialog = new JDialog();
            dialog.setBounds(300, 200, 400, 300);
            dialog.setVisible(true);
        }
    }

}

/**
 * Java事件监听处理——内部类处理
 *
 * @author codebrother
 */

class EventListener3 extends JFrame {
    private JButton btBlue, btDialog;

    // 构造方法
    public EventListener3() {
        setTitle("Java GUI 事件监听处理");
        setBounds(100, 100, 500, 350);
        setLayout(new FlowLayout());
        btBlue = new JButton("蓝色");
        btDialog = new JButton("弹窗");
        // 添加事件监听器对象(面向对象思想)
        btBlue.addActionListener(new ColorEventListener());
        btDialog.addActionListener(new DialogEventListener());

        add(btBlue);
        add(btDialog);
        setVisible(true);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
    // 内部类ColorEventListener，实现ActionListener接口
    class ColorEventListener implements ActionListener {
        @Override
        public void actionPerformed(ActionEvent e) {
            Container c = getContentPane();
            c.setBackground(Color.BLUE);
         }
    }
    // 内部类DialogEventListener，实现ActionListener接口
    class DialogEventListener implements ActionListener {
        @Override
        public void actionPerformed(ActionEvent e) {
            JDialog dialog = new JDialog();
            dialog.setBounds(300, 200, 400, 300);
            dialog.setVisible(true);
        }
    }

}



/**
 * Java事件监听处理——匿名内部类处理
 *
 * @author codebrother
 */
class EventListener2 extends JFrame {
    private JButton btBlue, btDialog;

    public EventListener2() {
        setTitle("Java GUI 事件监听处理");
        setBounds(100, 100, 500, 350);
        setLayout(new FlowLayout());

        btBlue = new JButton("蓝色");
        btDialog = new JButton("弹窗");
        
        // 添加事件监听器(此处即为匿名类)
        btBlue.addActionListener(new ActionListener() {
            // 事件处理
            @Override
            public void actionPerformed(ActionEvent e) {
                Container c = getContentPane();
                c.setBackground(Color.BLUE);
             }
        });
        
        // 并添加事件监听器   
        btDialog.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                JDialog dialog = new JDialog();
                dialog.setBounds(300, 200, 400, 300);
                dialog.setVisible(true);
            }
        });

        add(btBlue);
        add(btDialog);
        setVisible(true);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }

}

/**
 * Java事件监听处理——外部类处理
 *
 * @author codebrother
 */
class EventListener4 extends JFrame {
    private JButton btBlue, btDialog;

    public EventListener4() {
        setTitle("Java GUI 事件监听处理");
        setBounds(100, 100, 500, 350);
        setLayout(new FlowLayout());
        btBlue = new JButton("蓝色");
        btDialog = new JButton("弹窗");
        // 将按钮添加事件监听器
        btBlue.addActionListener(new ColorEventListener(this));
        btDialog.addActionListener(new DialogEventListener());

        add(btBlue);
        add(btDialog);
        setVisible(true);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }

}
// 外部类ColorEventListener，实现ActionListener接口
class ColorEventListener implements ActionListener {
    private EventListener4 el;
    ColorEventListener(EventListener4 el) {
        this.el = el;
    }
    @Override
    public void actionPerformed(ActionEvent e) {
        Container c = el.getContentPane();
        c.setBackground(Color.BLUE);
     }
}
// 外部类DialogEventListener，实现ActionListener接口
class DialogEventListener implements ActionListener {
    @Override
    public void actionPerformed(ActionEvent e) {
        JDialog dialog = new JDialog();
        dialog.setBounds(300, 200, 400, 300);
        dialog.setVisible(true);
    }
}

public class ActionListenerTest
{
    public static void main(String args[])
    {
        new EventListener2();
    }
}