第二个Java程序：本月日历的显示
显示本月的日历，每周的开始日期按照标准库中规定的日期，当天右侧用"*"进行标注，代码如下：
1 package Source1; 2 3 import java.text.DateFormatSymbols; 4 import java.util.*; 5 import java.io.*; 6 import java.awt.*; 7 import javax.swing.*; 8 9 public class Test2 { 10 public static void main(String[] args){ 11 GregorianCalendar now = new GregorianCalendar(); 12 int month = now.get(Calendar.MONTH); 13 int today = now.get(Calendar.DAY_OF_MONTH); 14 int intent = 0; 15 now.set(Calendar.DAY_OF_MONTH,1); 16 int week = now.get(Calendar.DAY_OF_WEEK); 17 int firstDayOfWeek = now.getFirstDayOfWeek(); 18 while(firstDayOfWeek != week){ 19 ++intent; 20 now.add(Calendar.DAY_OF_MONTH, -1); 21 week = now.get(Calendar.DAY_OF_WEEK); 22 } 23 String[] weekdayNames = new DateFormatSymbols().getShortWeekdays(); 24 do{ 25 System.out.printf("%4s",weekdayNames[week]); 26 now.add(Calendar.DAY_OF_MONTH, 1); 27 week = now.get(Calendar.DAY_OF_WEEK); 28 }while(week != firstDayOfWeek); 29 System.out.println(); 30 for(int i = 0;i < intent;++i){ 31 System.out.print(" "); 32 } 33 now.set(Calendar.DAY_OF_MONTH, 1); 34 week = now.get(Calendar.DAY_OF_WEEK); 35 int day = now.get(Calendar.DAY_OF_MONTH); 36 do{ 37 System.out.printf("%3s",day); 38 if(today == day){ 39 System.out.print("*"); 40 }else{ 41 System.out.print(" "); 42 } 43 now.add(Calendar.DAY_OF_MONTH, 1); 44 week = now.get(Calendar.DAY_OF_WEEK); 45 day = now.get(Calendar.DAY_OF_MONTH); 46 if(week == firstDayOfWeek){ 47 System.out.println(); 48 } 49 }while(month == now.get(Calendar.MONTH)); 50 if(week != firstDayOfWeek){ 51 System.out.println(); 52 } 53 } 54 }
运行后截图如下：
