java初学者问一个问题

怎样把图片用到我写的这个日历记事本上package myjishiben;
 
import  java.util.Calendar;
import  javax.swing.*;import  java.awt.*;
import  java.awt.event.*;
import  java.io.*;
import  java.util.Hashtable;public class CalendarPad  extends JFrame implements MouseListener{
 int year,month,day;
 Hashtable  hashtable;//创建了一个数字的哈希表
 File file;//java.io
 JTextField  showDay[];//是一个轻量级组件，它允许编辑单行文本
 JLabel   title[];//来显示和编辑规则的二维单元表
 Calendar  rili;//Calendar 类是一个抽象类，它为特定瞬间与一组诸如 YEAR、MONTH、DAY_OF_MONTH、HOUR 等 日历字段之间的转换提供了一些方法
 int whichweekday;
 Image img;//444444444444
 NotePad  notpad=null;
 Month    modifyMonth;
 Year     modifyYear;
 String week[]={"星期日","星期一","星期二","星期三","星期四","星期五","星期六"};
 JPanel  leftPanel, rithPanel;//是一般轻量级容器。有关 JPanel 的示例和面向任务的文档
 
 public CalendarPad(int year,int month,int day)
 { 
  leftPanel = new JPanel();
  JPanel leftCenter = new JPanel();
  JPanel leftNorth = new JPanel();
  leftCenter.setLayout(new  GridLayout(7,7));
  rithPanel =  new JPanel();
 
  this.year = year;
  this.month =month;
  this.day = day;
  modifyYear = new Year(this);
 
  modifyMonth = new Month(this);
    
  title = new JLabel[7];
  showDay = new JTextField[42];
 
  for(int j=0;j<7;j++){
  title[j]=new JLabel();
  title[j].setText(week[j]);
  title[j].setBorder(BorderFactory.createEmptyBorder() );
  leftCenter.add(title[j]);
  }
  title[0].setForeground(Color.red);
  title[6].setForeground(Color.blue);
 
  for(int k =0;k<42;k++)
  {
 
  showDay[k] = new JTextField();  
  showDay[k].addMouseListener(this);
  showDay[k].setEditable(false);  
  leftCenter.add(showDay[k]);
  }
 
  rili = Calendar.getInstance();
  Box box = Box.createHorizontalBox();
  box.add(modifyYear);
  box.add(modifyMonth);
  leftNorth.add(box);
 
  leftPanel.setLayout( new BorderLayout());
  leftPanel.add(leftNorth, BorderLayout.NORTH);
  leftPanel.add(leftCenter, BorderLayout.CENTER);
  leftPanel.add(new Label("请在年份输入框中输入所查年份,并回车确定"), BorderLayout.SOUTH);  
  leftPanel.validate();
 
  Container  con = getContentPane();
  JSplitPane  split = new  JSplitPane(JSplitPane.HORIZONTAL_SPLIT,leftPanel,rithPanel);
    con.add(split,BorderLayout.SOUTH);
    con.validate();
    //con.add(split,BorderLayout.SOUTH);
    
    
    hashtable = new Hashtable();
    file = new  File("日历记事本.txt");
    
    
    if (!file.exists())
    {
     try{
     FileOutputStream out = new FileOutputStream(file);
     ObjectOutputStream  objectOut = new ObjectOutputStream(out);
     objectOut.writeObject( hashtable);
     objectOut.close();
     out.close();
     }catch(Exception t){
      
    
     }
    }
    
    
    notpad=new NotePad(this);
    rithPanel.add(notpad);
    
   // System.out.println(" "+year+" "+month+" "+day);
    
    setRilipai(year, month);
addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0);
}
});
this.setVisible(true);
this.setBounds(200,100,700,500);
this.validate();
 }
 
 public void setRilipai(int year,int month){
  rili.set(year,month-1,1);
 
  whichweekday = rili.get(Calendar.DAY_OF_WEEK)-1;  
  if(month==1||month==3||month==5||month==7||month==8||month==10||month==12){
  pailihaoma(whichweekday,31,month,year);
  }
  if(month==4||month==6||month==9||month==11){
  pailihaoma(whichweekday,30,month,year);
  }
  if(month==2){
  if((year%4==0&&year%100!=0)||(year%400==0)){
  pailihaoma(whichweekday,29,month,year);
  }
  else{
  pailihaoma(whichweekday,28,month,year);  
  }
 
  }
 
 }
 public void pailihaoma( int whichweekday , int yuetianshu,int month,int year){
  //System.out.println("paili  "+whichweekday+"paili"+yuetianshu);
  Calendar calendar = Calendar.getInstance();
  int y2 = calendar.get(Calendar.YEAR);
  int m2 = calendar.get(Calendar.MONTH)+1;
  int d2 = calendar.get(Calendar.DAY_OF_MONTH);
  for( int i=whichweekday,n=1;i<whichweekday+yuetianshu;i++){  
  showDay[i].setText(" "+n);  
  if(n==d2&&month==m2&&year==y2){
  showDay[i].setForeground(Color.green);
  showDay[i].setFont(new Font("TemesRoman",Font.BOLD,20));
  }
  else{
  showDay[i].setForeground(Color.black);
  showDay[i].setFont(new Font("TemesRoman",Font.BOLD,12));
 
  }
  if(i%7==6){
  showDay[i].setForeground(Color.blue);
  }
  if(i%7==0){
  showDay[i].setForeground(Color.red);
  }
  n++;
  }
  for(int i=0;i<whichweekday;i++){
  showDay[i].setText("  ");
  }
  for(int i=whichweekday+yuetianshu;i<42;i++){
  showDay[i].setText("  ");
  }
 
 
 }
 public int getYear(){
  return year;
 }
 public void setYear(int y){
  year=y;
  notpad.setYear(year);
 }
 public int getMonth(){
  return month;
 }
 public void setMonth(int m ){
  month=m;
  notpad.setMonth(month);
 
 }
 public int getDay(){
  return day;  
 }
 public void setDay(int d){
  day=d;
  notpad.setDay(day);
 }
 public Hashtable  getHashtabel(){
  return hashtable;
 }
 public File getFile(){
  return file;
 }
 public void mousePressed(MouseEvent e){
 
  JTextField  source = (JTextField)e.getSource();
  String s = source.getText().trim();
 
  try{
 
  day=Integer.parseInt(s);
 
  notpad.setDay(day);
  notpad.shezhixinxitiao(year,month,day);
  notpad.shezhiwenbenqu(null);
  notpad.huoqurizhiwenben(year,month,day);
  }catch(Exception ee){
  System.out.println(ee);
  }
 }
 public void mouseClicked(MouseEvent e){
 
 }
 public void mouseReleased(MouseEvent e){
 
 }
 public void mouseEntered(MouseEvent e){
       
 
 }
 public void mouseExited(MouseEvent e){
 
 }
 public static void main(String args[]){
  Calendar calendar = Calendar.getInstance();
 
  int y = calendar.get(Calendar.YEAR);
  int m = calendar.get(Calendar.MONTH);
  int d = calendar.get(Calendar.DAY_OF_MONTH);
  //System.out.println(" main "+y+m+d);
  new CalendarPad(y,m+1,d);
 } }