import java.awt.*;
import java.awt.event.*;
import java.io.*;
class GuiDemo6
{
    public static void main(String []args)
    {
        MyGuiFrame mgf = new MyGuiFrame("文件目录");

    }
}

class MyGuiFrame extends Frame
{
    private TextField tf;
    private TextArea ta;
    private Button btn;

    private Label lab;

    public MyGuiFrame(String title)
    {
        super(title);
        setBounds(200,150,500,600);
        setLayout(new FlowLayout());
        tf = new TextField(50);
        btn = new Button("转到");
        ta = new TextArea(30,65);
        add(tf);
        add(btn);
        add(ta);
        setVisible(true);
        myEvent();
    }
    private void myEvent()
    {
        addWindowListener(new WindowAdapter()
        {
            public void windowClosing(WindowEvent e)
            {
                setVisible(false);
                dispose();
                System.exit(0);
            }
        });
        tf.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent e)
            {                
            }
        });
        btn.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent e)
            {
                ta.setText("");
                getFile();
            }
        });
    }

    private void getFile()
    {
        String str = tf.getText();
        File file = new File(str);
        if(file.isDirectory())
        {
            String [] names = file.list();
            for(String name :names)
            {
                ta.append(name+"\r\n");
            }
        }
        else
        {            
            MyDialog dia = new MyDialog(this,"系统提示",true);
            dia.setStr(str);
            dia.run();
        }
    }
}

class MyDialog extends Dialog
{
    private Label lab ;
    private Button btn;
    private String str;
    public MyDialog(Frame f, String s,boolean m)
    {
        super(f,s,m);
        setBounds(250,200,280,200);
        lab = new Label();
        
        btn = new Button("确定");
        setLayout(new FlowLayout());
        add(lab);
        add(btn);
        
    }
    public void setStr(String str)
    {
        this.str = str;
    }
    public void run()
    {
        String info = "对不起！你指定的目录："+str+"是出错误的！";
        lab.setText(info);
        setVisible(true);
        btn.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent e)
            {
                setVisible(false);
                dispose();
            }
        });
        addWindowListener(new WindowAdapter()
        {
            public void windowClosing(WindowEvent e)
            {
                setVisible(false);
                dispose();
            }
        });
    }
}