哪里写错了 - 黑马程序员技术交流社区

<p>import java.io.*;
import java.awt.*;
import java.awt.event.*;
class MyWinDemo
{
private Frame f;
private Menu fileMenu;
private MenuBar bar;
private MenuItem openItem,saveItem,exit;
private TextArea ta;
private Dialog openDia,saveDia;
private File file;
MyWinDemo()
{
init();
}
public void init()
{
f = new Frame("My window");
f.setBounds(300,240,500,420);
bar = new MenuBar();
f.setMenuBar(bar);
fileMenu = new Menu("文件");
bar.add(fileMenu);
openItem = new MenuItem("打开");
saveItem = new MenuItem("保存");
exit = new MenuItem("退出");
openDia = new FileDialog(f,"open",FileDialog.LOAD);
openDia = new FileDialog(f,"closed",FileDialog.SAVE);
fileMenu.add(openItem);
fileMenu.add(saveItem);
fileMenu.add(exit);
ta = new TextArea();
f.add(ta);
myEvent();
f.setVisible(true);
}
public void myEvent()
{
openItem.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
openDia.setVisible(true);
String dirPath = openDia.getDirectory();
String fileName = openDia.getFile();
if(dirPath==null || fileName == null)
return;
file = new File(dirPath,fileName);
try
{
BufferedReader bufr = new BufferedReader(new FileReader(file));
String line = null;
while((bufr.readLine())!=null)
{
ta.append(line);
//bufr.flush();
}
bufr.close();
}
catch (IOException ex)
{
throw new RuntimeException("文件读取失败");
}
}
});
f.addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});
exit.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
System.exit(0);
}
});
}
}
class MyWindow
{
public static void main(String[] args)
{
new MyWinDemo();
}
}

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