/** * Java事件監聽處理――自身類實現ActionListener接口，作為事件監聽器 * * @author codebrother */class EventListener1 extends JFrame implements ActionListener {  private JButton btBlue, btDialog;  public EventListener1() {    setTitle("Java GUI 事件監聽處理");    setBounds(100, 100, 500, 350);    setLayout(new FlowLayout());    btBlue = new JButton("藍色");       btDialog = new JButton("彈窗");        // 將按鈕添加事件監聽器    btBlue.addActionListener(this);    btDialog.addActionListener(this);    add(btBlue);    add(btDialog);    setVisible(true);    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  }  // ***************************事件處理***************************  @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事件監聽處理――內部類處理 * * @author codebrother */class EventListener3 extends JFrame {  private JButton btBlue, btDialog;  // 構造方法  public EventListener3() {    setTitle("Java GUI 事件監聽處理");    setBounds(100, 100, 500, 350);    setLayout(new FlowLayout());    btBlue = new JButton("藍色");    btDialog = new JButton("彈窗");    // 添加事件監聽器對象(面向對象思想)    btBlue.addActionListener(new ColorEventListener());    btDialog.addActionListener(new DialogEventListener());    add(btBlue);    add(btDialog);    setVisible(true);    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  }  // 內部類ColorEventListener，實現ActionListener接口  class ColorEventListener implements ActionListener {    @Override    public void actionPerformed(ActionEvent e) {      Container c = getContentPane();      c.setBackground(Color.BLUE);    }  }  // 內部類DialogEventListener，實現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事件監聽處理――匿名內部類處理 * * @author codebrother */class EventListener2 extends JFrame {  private JButton btBlue, btDialog;  public EventListener2() {    setTitle("Java GUI 事件監聽處理");    setBounds(100, 100, 500, 350);    setLayout(new FlowLayout());    btBlue = new JButton("藍色");    btDialog = new JButton("彈窗");        // 添加事件監聽器(此處即為匿名類)    btBlue.addActionListener(new ActionListener() {      // 事件處理      @Override      public void actionPerformed(ActionEvent e) {        Container c = getContentPane();        c.setBackground(Color.BLUE);      }    });        // 并添加事件監聽器     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事件監聽處理――外部類處理 * * @author codebrother */class EventListener4 extends JFrame {  private JButton btBlue, btDialog;  public EventListener4() {    setTitle("Java GUI 事件監聽處理");    setBounds(100, 100, 500, 350);    setLayout(new FlowLayout());    btBlue = new JButton("藍色");    btDialog = new JButton("彈窗");    // 將按鈕添加事件監聽器    btBlue.addActionListener(new ColorEventListener(this));    btDialog.addActionListener(new DialogEventListener());    add(btBlue);    add(btDialog);    setVisible(true);    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  }}// 外部類ColorEventListener，實現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);  }}// 外部類DialogEventListener，實現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();  }}