1 /**
2 * Created by GETTING MORE on 2017/6/7.
3 */
4 import java.text.DateFormatSymbols;
5 import java.util.Calendar;
6 import java.util.GregorianCalendar;
7 import java.util.Locale;
8
9 public class Date {
10 public static void main(String[] args) {
11 Locale.setDefault(Locale.CHINA);//此行可加也可不加；
12 GregorianCalendar d = new GregorianCalendar();
13 int today = d.get(Calendar.DAY_OF_MONTH);
14 int month = d.get(Calendar.MONTH); //month的取值从0开始，即比正常值少一，如6月，实际输出为5
15 // int week=d.get(Calendar.DAY_OF_WEEK);
16 //System.out.print(week);
17
18 d.set(Calendar.DAY_OF_MONTH, 1);
19 //set today is the first day of this month
20 // int Da=d.get(Calendar.DAY_OF_MONTH);
21 // System.out.print(Da);
22 int weekday = d.get(Calendar.DAY_OF_WEEK); //weekday is a number of 1-7,the monday is 2;and the sunday is 1.
23 //System.out.print(weekday);
24 int firstDayOfWeek = d.getFirstDayOfWeek();
25 //System.out.print(firstDayOfWeek);
26 int indent = 0;
27 while (weekday != firstDayOfWeek) {
28 indent++;
29 d.add(Calendar.DAY_OF_MONTH, -1); //这里起始值是1（因为上面已经把今天设置为本月第一天）
30 // 所以减1后调到上个月最后一天）
31 //int nowday=d.get(Calendar.DAY_OF_MONTH);
32 // System.out.print(nowday);
33 weekday = d.get(Calendar.DAY_OF_WEEK);
34 //System.out.print(weekday);
35 }
36 //System.out.print(indent);
37 //System.out.print("#"+weekday+"#");
38 //方法1： String[] weekdayNames = {"","Sun","Mon","Tue","Thu","Wed","Fri","Sat"};
39 String[] weekdayNames=new DateFormatSymbols().getShortWeekdays(); //方法2
40 do {
41 System.out.printf("%4s", weekdayNames[weekday]);
42 d.add(Calendar.DAY_OF_MONTH, 1);//这里起始值为上月的28号
43 weekday = d.get(Calendar.DAY_OF_WEEK);
44 }
45 while (weekday != firstDayOfWeek);
46 System.out.println();
47 for (int i = 1; i <= indent; i++)
48 System.out.print(" ");
49 d.add(Calendar.DAY_OF_MONTH, 1); //这里用DAY_OF_MONTH或DAY_OF_WEEK输出结果一致；
50 d.set(Calendar.DAY_OF_MONTH,1);
51 do {
52 int day = d.get(Calendar.DAY_OF_MONTH);
53 System.out.printf("%4d", day);
54 if (day == today)System.out.print("* ");
55 else System.out.print(" ");
56 d.add(Calendar.DAY_OF_MONTH, 1);
57 weekday = d.get(Calendar.DAY_OF_WEEK);
58 if (weekday == firstDayOfWeek)
59 System.out.println();
60 }
61 while (d.get(Calendar.MONTH)== month);//因为这里的错误，耽误了大把的时光。错误原因：检查不认真，把Calendar.Month
62 //写成了Calendar.Day_Of_Month,造成出错。
63 if (weekday!=firstDayOfWeek)
64 System.out.println();
65 }
66 }
