新手恳求帮忙？

Question

1、先修改Reminder类
import java.util.Timer;
import java.util.TimerTask;
import java.util.*;
import javax.swing.*;
public class Reminder{
Timer timer;
JLabel jl;

public Reminder(open op) {  ////////////////////将open对象由此传入
jl=op.aLabel;      ////////////////////将aLabel赋值给jl
timer = new Timer();
timer.scheduleAtFixedRate(new RemindTask(), new Date(),1000);
}

class RemindTask extends TimerTask {
public void run() {
jl.setText((new Date()).toLocaleString());
}
}
}
将open对象传入该类，也可以只传open.aLabel2、
在open中加入一句：
aLabel=new JLabel();
new Reminder(this);  //////由于open有诸多错误，大概改了一下，能运行了import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.awt.datatransfer.*;
import java.util.Date;
import java.io.*;
import javax.swing.text.*;
import javax.swing.event.*;import java.io.FileWriter;
public class open extends JFrame implements ActionListener
{
   public JFrame aFrame;
public JLabel aLabel,bLabel;
   public JPanel aPane1, aPane2;
   public JButton open,save,exit,color,help;
   public JTextArea aTextArea;
   public JScrollPane aScrollPane;
   public JPopupMenu filePopup;
   public JMenuItem newMenuItem,openMenuItem,saveMenuItem,exitMenuItem,copyMenuItem,pasteMenuItem,cutMenuItem;
public JComboBox aComboBox;
   public Clipboard aClipboard;   public open()
   {
      aFrame =new JFrame("open");
      aPane1=new JPanel();      aTextArea=new JTextArea(); aLabel=new JLabel();

new Reminder(this);

bLabel=new JLabel("font");
Date now=new Date();
aLabel.setText(now.getHours()+":"+now.getMinutes()+":"+now.getSeconds());
      open=new JButton("open");
      save=new JButton("save");
      exit=new JButton("exit");
      color=new JButton("color");
      help=new JButton("help");
String[] choices={"1","2"};
aComboBox=new JComboBox(choices);
      filePopup= new JPopupMenu();
      newMenuItem=new JMenuItem("new");
      openMenuItem= new JMenuItem("open");
      saveMenuItem= new JMenuItem("save",'s');
      saveMenuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S,InputEvent.CTRL_MASK,false));
      
      copyMenuItem= new JMenuItem("copy",'c');
      copyMenuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C,InputEvent.CTRL_MASK,false));
      pasteMenuItem= new JMenuItem("paste",'p');
      pasteMenuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_V,InputEvent.CTRL_MASK,false));
      cutMenuItem= new JMenuItem("cut",'t');
      cutMenuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_T,InputEvent.CTRL_MASK,false));
      exitMenuItem= new JMenuItem("exit");      aClipboard = getToolkit().getSystemClipboard();
          open.addActionListener(this);
      save.addActionListener(this);
      exit.addActionListener(this);
      color.addActionListener(this);
      help.addActionListener(this);
aComboBox.addItemListener( new ChoiceListener());      newMenuItem.addActionListener(this);
      openMenuItem.addActionListener(this);
      saveMenuItem.addActionListener(this);
      exitMenuItem.addActionListener(this);
      copyMenuItem.addActionListener(this);
      pasteMenuItem.addActionListener(this);
      cutMenuItem.addActionListener(this);      aScrollPane=new JScrollPane(aTextArea);     
      aFrame.setSize(400,400);
      aFrame.getContentPane().add(aPane1,BorderLayout.NORTH);
      aFrame.getContentPane().add(aScrollPane);
aTextArea.addMouseListener(new MouseAdapter()
{  
    public void mouseReleased(MouseEvent e)
    {
     if (e.isPopupTrigger())
     {
      filePopup.show(e.getComponent(),e.getX(),e.getY());
     }
    }
});aPane1.add(aLabel);
      aPane1.add(open);
      aPane1.add(save);      
      aPane1.add(color);
      aPane1.add(exit);
      aPane1.add(help);
aPane1.add(bLabel);
aPane1.add(aComboBox);filePopup.add(newMenuItem);
filePopup.add(openMenuItem);
filePopup.add(saveMenuItem);
filePopup.addSeparator();
filePopup.add(copyMenuItem);
filePopup.add(pasteMenuItem);
filePopup.add(cutMenuItem);
filePopup.addSeparator();
filePopup.add(exitMenuItem);      aFrame.setVisible(true);
      aFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
aTextArea.requestFocus();
    }
    public void actionPerformed(ActionEvent e){
    }
class ChoiceListener implements ItemListener
{  public void itemStateChanged( ItemEvent e)
   {
if(aComboBox.getSelectedItem()=="1")
{
aTextArea.setFont(new  Font("ËÎÌå",Font.PLAIN,16));
} 
}
} public static void main (String args[]) {

new open();
   // System.out.println("Task scheduled.");
}
}