问一个关于printf输出格式的问题

[beingyourself]

源程序：
import java.util.*;
public class CalendarTest {
public static void main(String[] args)
{
GregorianCalendar d=new GregorianCalendar();
int today=d.get(Calendar.DAY_OF_MONTH);
int month=d.get(Calendar.MONTH);

d.set(Calendar.DAY_OF_MONTH,1);
int week=d.get(Calendar.DAY_OF_WEEK);
System.out.println("SUN MON TUE WED THR FRI SAT");


for(int i=Calendar.SUNDAY;i<week;i++)
System.out.print(" ");
do
{
int day=d.get(Calendar.DAY_OF_MONTH);

System.out.printf("%3d",day);

if(day==today)
System.out.print("*");
else
System.out.print(" ");
if(week==Calendar.SATURDAY)
System.out.println();
d.add(Calendar.DAY_OF_MONTH,1);
week=d.get(Calendar.DAY_OF_WEEK);
}while(d.get(Calendar.MONTH)==month);
}

}
输出结果：
SUN MON TUE WED THR FRI SAT
1 2
3 4 5 6 7 8 9
10 11 12 13 14 15 16
17 18 19 20 21 22 23
24* 25 26 27 28 29
我怎么把输出结果变为：
SUN MON TUE WED THR FRI SAT
1 2
3 4 5 6 7 8 9
10 11 12 13 14 15 16
17 18 19 20 21 22 23
24* 25 26 27 28 29
就是让数字对应中间?

[rain_night]

用\t把，不过就是空的有点大

[rain_night]

这是我写的，比较笨

package face;
import   java.util.Calendar; 
import   java.util.GregorianCalendar; 
class   CalendarTest 
{ 

    public   static   void   main(String[]   args) 
    { 
        GregorianCalendar   a=new   GregorianCalendar(); 
        int   day=a.get(Calendar.DAY_OF_MONTH); 
        int   month=a.get(Calendar.MONTH); 
        a.set(Calendar.DAY_OF_MONTH,1); 
        int   weekday=a.get(Calendar.DAY_OF_WEEK);
        System.out.println("本月的日历：");
        System.out.println("日   一   二   三   四   五   六   "); 
        for(int   i=Calendar.SUNDAY;i <weekday;i++) 
        { 
            System.out.print("     ");
        } 
        do{ 
            int   today=a.get(Calendar.DAY_OF_MONTH); 
            System.out.printf("%2d",today);
        if(day==today) 
        { 
            System.out.print("*  ");
        } 
        else 
        { 
            System.out.print("   "); 
        } 
        if(a.get(Calendar.DAY_OF_WEEK)==7)
        { 
            System.out.println(); 
        } 
            a.add(Calendar.DAY_OF_MONTH,1); 
        }while(a.get(Calendar.MONTH)==month); 
        System.out.println();
    } 
}

[rain_night]

改的楼主的

public class CalendarTest1 {
	public static void main(String[] args) {
		GregorianCalendar d = new GregorianCalendar();
		int today = d.get(Calendar.DAY_OF_MONTH);
		int month = d.get(Calendar.MONTH);

		d.set(Calendar.DAY_OF_MONTH, 1);
		int week = d.get(Calendar.DAY_OF_WEEK);
		System.out.println("SUN\tMON\tTUE\tWED\tTHR\tFRI\tSAT");

		for (int i = Calendar.SUNDAY; i < week; i++)
			System.out.print("\t");
		do {
			int day = d.get(Calendar.DAY_OF_MONTH);

			System.out.print(day+"\t");

			if (day == today)
				System.out.print("**");
			else
//				System.out.print("   ");
			if (week == Calendar.SATURDAY)
				System.out.println();
			d.add(Calendar.DAY_OF_MONTH, 1);
			week = d.get(Calendar.DAY_OF_WEEK);
		} while (d.get(Calendar.MONTH) == month);
	}
}

[老紫竹]

System.out.printf("%5d",day);
你可以指定每个数字的输出占用的宽度，%5d 就是5个位置的数字，不足的前面默认补空白