import java.text.SimpleDateFormat;
import java.util.Calendar;
public class Day{
    public static void main(String [] args){
        SimpleDateFormat sf=new SimpleDateFormat();
        Calendar cal=Calendar.getInstance();
        //System.out.println("今天是这一年的第"+cal.get(Calendar.DAY_OF_YEAR)+"天");//今天是一年中得第几天   
        //System.out.println("今天是星期"+(cal.get(Calendar.DAY_OF_WEEK)-1));    //今天是星期几
        //System.out.println("当前时间："+cal.get(Calendar.DAY_OF_MONTH)+"号");
        int maxDay=cal.getActualMaximum(Calendar.DAY_OF_MONTH);//打印日历图形
        System.out.println("   日     一     二     三     四     五     六     ");
        for(int i=1;i<=maxDay;i++){
            cal.set(Calendar.DAY_OF_MONTH, i);//设置当前的时间
            int week=cal.get(Calendar.DAY_OF_WEEK)-1;//表示星期几
            if(i==1){
                for(int j=0;j<week;j++)System.out.print("    ");
            //打印1号的空格
                if(week!=6){//星期六的时候换行
                    System.out.print(sf.format(cal.getTime())+" ");
                }
                else{
                    System.out.println(i);
                }
            }
            
        }
    }
}