窗口现实文件目录程序代码

import java.awt.*;
import java.awt.event.*;
import java.io.*;
class MyWindow
{
	private Frame f;
	private TextField tf;
	private Button but,okBut;
	private TextArea ta;
	private Label lab;
	private Dialog dia;
	private MyDialog mydia;

	MyWindow()
	{
		init();
	}

	public  void init()
	{
		f = new Frame("my window");
		f.setBounds(300,200,600,500);
		f.setLayout(new FlowLayout());

		tf = new TextField(60);//可以传入字符个数。
		but = new Button("转  到");
		ta = new TextArea(25,70);//可传入行和列。

		dia = new Dialog(f,"错误信息",false);
		dia.setBounds(400,300,280,200);
		dia.setLayout(new FlowLayout());

		lab = new Label();
		okBut = new Button("确  定");
		dia.add(lab);
		dia.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)
			{
				dia.setVisible(false);
			}
		});
		dia.addWindowListener(new WindowAdapter()
		{
			public void windowClosing(WindowEvent e)
			{
				dia.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 path = tf.getText();
		File dir = new File(path);
		ta.setText("");
		if(dir.exists() && dir.isDirectory())
		{
			String[] names = dir.list();
			for(String name : names)
			{
				ta.append(name+"\r\n");
			}
		}
		else
		{
			//dia.setVisible(true);
			String info = "输入的路径"+path+"是错误的。";
			//lab.setText(info);
//			mydia = new MyDialog(f,"路径错误",true,info);
			MyDialog.getMyDialog(f,"路径错---误",true,info);
		}
	}
}

class MyDialog
{
	private String message;
	private Dialog d;
	private Button but;
	private Label lab;
	private MyDialog md = new MyDialog(null,null,false,null);
	private MyDialog(Frame f,String title,boolean mode,String message)
	{
		d = new Dialog(f,title,mode);

		d.setBounds(400,300,280,200);
		d.setLayout(new FlowLayout());


		but = new Button("自定义确定");
		lab = new Label(message);

		d.add(lab);
		d.add(but);

		myEvent();


		d.setVisible(true);
	}
	public static MyDialog getMyDialog()
	{
		return md;

	}
	public void setTitle(String message)
	{
		this.mesage =message;
	}
	private void myEvent()
	{
		but.addActionListener(new ActionListener()
		{
			public void actionPerformed(ActionEvent e)
			{
				d.setVisible(false);
			}
		}
	}
}