Java添加事件的幾種方式（轉載了codebrother的文章，做了稍微的改動）：
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/** * Java事件監聽處理——自身類實現ActionListener接口，作爲事件監聽器 * * @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(此處即爲匿名類) btBlue.addActionListener(new ActionListener() { // 事件處理 @Override public void actionPerformed(ActionEvent e) { Container c = getContentPane(); c.setBackground(Color.BLUE); } });
// 並添加事件監聽器 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(); } } |
