Java监听器

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/**
* 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();  }}

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