Java-GUI(练习-列出指定目录内容)-(对话框Dialog)

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import java.awt.*;import java.awt.event.*;import java.io.*; class MyWindowDemo{    private Frame f;    private TextField tf;    private Button but;    private TextArea ta;         private Dialog d;    private Label lab;    private Button okBut;         MyWindowDemo()    {        init();    }    public void init()    {        f = new Frame("my window");        f.setBounds(300,100,600,500);        f.setLayout(new FlowLayout());                 tf = new TextField(60);                 but = new Button("转到");                 ta = new TextArea(25,70);                 d = new Dialog(f,"提示信息-self",true);        d.setBounds(400,200,240,150);        d.setLayout(new FlowLayout());        lab = new Label();        okBut = new Button("确定");                 d.add(lab);        d.add(okBut);                 f.add(tf);        f.add(but);        f.add(ta);                 myEvent();        f.setVisible(true);    }         private void myEvent()    {        okBut.addActionListener(new ActionListener()        {            public void actionPerformed(ActionEvent e)            {                d.setVisible(false);            }        });        d.addWindowListener(new WindowAdapter()        {            public void windowClosing(WindowEvent e)            {                d.setVisible(false);            }        });                 tf.addKeyListener(new KeyAdapter()        {            public void keyPressed(KeyEvent e)            {                if(e.getKeyCode()==KeyEvent.VK_ENTER)                    showDir();            }        });                 but.addActionListener(new ActionListener()        {            public void actionPerformed(ActionEvent e)            {                showDir();            }        });        f.addWindowListener(new WindowAdapter()        {            public void windowClosing(WindowEvent e)            {                System.exit(0);            }        });    }         public void showDir()    {        String dirPath = tf.getText();                         File dir = new File(dirPath);         if(dir.exists() && dir.isDirectory())        {            ta.setText("");            String[] names = dir.list();            for(String name : names)            {                ta.append(name+"\r\n");            }        }        else        {            String info = "您输入的信息："+dirPath+"是错误的。请重输";            lab.setText(info);            d.setVisible(true);        }        // ta.setText(text);                       // System.out.println(text);                 // tf.setText("");    }    public static void main(String[] args)    {        new MyWindowDemo();    }}
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