Giúp mình code ve java

[duyanh]

import javax.swing.*;
import java.awt.event.*;
import java.io.*;


public class SampleFile1 extends JFrame implements ActionListener
{

   JLabel idLabel;
   JLabel passLabel;
   JTextField idText;
   JPasswordField passText;
   JButton loginButton;
   JButton registerButton;

   public SampleFile1()
   {
      super("Login");
      setLayout(null);

      idLabel=new JLabel("ID");
      add(idLabel);
      idLabel.setBounds(20,20,50,20);

      idText=new JTextField();
      add(idText);
      idText.setBounds(70,20,210,20);

      passLabel=new JLabel("Pass");
      add(passLabel);
      passLabel.setBounds(20,40,50,20);

      passText=new JPasswordField();
      add(passText);
      passText.setBounds(70,40,210,20);

      loginButton=new JButton("Login");
      add(loginButton);
      loginButton.setBounds(180,80,100,20);

      registerButton=new JButton("Register");
      add(registerButton);
      registerButton.setBounds(80,80,100,20);

      registerButton.addActionListener(this);
      loginButton.addActionListener(this);

      setSize(300,150);
      show();

   }


   public void actionPerformed(ActionEvent e)
   {
      try
      {
         JButton bt;
         Account a;
         JFrame mainFrame=new JFrame("Main");
         mainFrame.setSize(300,300);
         boolean check=false;
         bt=(JButton)e.getSource();
         if(bt==registerButton)
         {
            FileOutputStream fOut=new FileOutputStream("user.dat",true);
            ObjectOutputStream objOut=new ObjectOutputStream(fOut);
            a=new Account(idText.getText(),passText.getText());
            objOut.writeObject(a);
            fOut.close();
            objOut.close();

         }
         if(bt==loginButton)
         {
            FileInputStream fIn=new FileInputStream("uses.dat");
            ObjectInputStream objIn=new ObjectInputStream(fIn);
            a=(Account)objIn.readObject();
            while(a!=null&&!check)
            {
               if(idText.getText().equals(a.id)&&passText.getText().equals(a.pass))
               {
                  mainFrame.setVisible(true);
                  check=true;

               }
            a=(Account)objIn.readObject();

            }
            if(!check) JOptionPane.showMessageDialog(this,"Try again");
            fIn.close();
            objIn.close();
         }
      }
      catch(IOException ex)
      {

      }
      catch(ClassNotFoundException ex)
      {

      }

   }


   public static void main(String [] ts)
   {
      new SampleFile1();
   }


}



Chương trình này kô đọc được cái file user.dat hay sao ấy, kô hiểu mình làm sai cái gì nữa

[saos@ngmo]

lập trình viên java adx đâu roài, vào giúp em nó cái

[phamhongtu]

Cái này thì mình chịu roài ! :(