一段打印日历到控制台的代码

import java.util.Calendar;
import java.util.GregorianCalendar;

public class Test {
  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 weekday = d.get(Calendar.DAY_OF_WEEK);
    System.out.println("Sun   Mon   Tue   Wed   Thu   Fri   Sat");
    for (int i = Calendar.SUNDAY; i < weekday; 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 (weekday == Calendar.SATURDAY)
        System.out.println();
      d.add(Calendar.DAY_OF_MONTH, 1);
      weekday = d.get(Calendar.DAY_OF_WEEK);
    } while (d.get(Calendar.MONTH) == month);
    if (weekday != Calendar.SUNDAY)
      System.out.println();
  }
}

Sun   Mon   Tue   Wed   Thu   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