例13-6.txt

这是一本java基础教程 对新手上路有很大帮助

网页文件如下：
<applet code=Example13_6.class width=330 height=240> 
<Param name="year"  value ="2008">
</applet>
【例13-6】
import java.util.*; 
import javax.swing.*; 
import java.awt.*;
import java.awt.event.*;
public class Example13_6 extends
JApplet implements ActionListener{
    JTable table;
    Object a[][]=new Object[6][7];
    Object name[]=
{"星期日","星期一","星期二","星期三", "星期四","星期五","星期六"};
    JButton nextMonth,previousMonth;
    int year=2008,month=1;
    CalendarBean calendar;
    JLabel showMessage=new JLabel("",JLabel.CENTER);
    public void init(){
        calendar=new CalendarBean();
        String s=getParameter("year");                //从html得到"year"的值
        try{  year=Integer.parseInt(s);
        }
        catch(Exception e){
            year=2008;
        }
        calendar.setYear(year);
        calendar.setMonth(month);
        String day[]=calendar.getCalendar();
        table=new JTable(a,name);
        table.setRowSelectionAllowed(false); 
        setTable(day);
        nextMonth=new JButton("下月");
        previousMonth=new JButton("上月");
        nextMonth.addActionListener(this);
        previousMonth.addActionListener(this);
        JPanel pNorth=new JPanel(),
              pSouth=new JPanel();
        pNorth.add(previousMonth);
        pNorth.add(nextMonth);
        pSouth.add(showMessage);
        showMessage.setText("日历："+calendar.getYear()+"年"+ calendar.getMonth()+"月" );
        Container con=getContentPane(); 
        con.add(new JScrollPane(table),BorderLayout.CENTER); 
        con.add(pNorth,BorderLayout.NORTH);
        con.add(pSouth,BorderLayout.SOUTH);
        con.validate();
     }
     public void actionPerformed(ActionEvent e){
        if(e.getSource()==nextMonth){
           month=month+1;
           if(month>12)
              month=1;
           calendar.setMonth(month);
           String day[]=calendar.getCalendar();
           setTable(day);
           table.repaint();
        }
        else if(e.getSource()==previousMonth){
           month=month-1;
           if(month<1)
              month=12;
           calendar.setMonth(month);
           String day[]=calendar.getCalendar();
           setTable(day);
           table.repaint();
        }
        showMessage.setText("日历："+calendar.getYear()+"年"+calendar.getMonth()+"月" );
    }
    public void setTable(String day[]){                     //设置表格单元格中的数据
        int n=0;
        for(int i=0;i<6;i++){
           for(int j=0;j<7;j++){
                a[i][j]=day[n];
                n++; 
           }
        }  
    }
}
class CalendarBean{
    String day[];
    int year=2005,month=0;
    public void setYear(int year){
       this.year=year;
    }
    public int getYear(){
       return year; 
    }
   public void setMonth(int month){
       this.month=month;
    }
   public int getMonth(){
       return month; 
    }
   public String[] getCalendar(){
       String a[]=new String[42];                             //存放号码的一维数组
       Calendar 日历=Calendar.getInstance();
       日历.set(year,month-1,1);             
       int 星期几=日历.get(Calendar.DAY_OF_WEEK)-1;
       int day=0;
       if(month==1||month==3||month==5||month==7||month==8||month==10||month==12)
          day=31;
       if(month==4||month==6||month==9||month==11)
          day=30;
       if(month==2)
           if(((year%4==0)&&(year%100!=0))||(year%400==0))
              day=29;
           else
              day=28;
       for(int i=星期几,n=1;i<星期几+day;i++){
            a[i]=String.valueOf(n) ;
            n++;
        }  
        return a;
    } 
}