1 import java.util.*;
2 import java.text.*;
3 class Demo
4 {
5 public static void main(String[] args)
6 {
7 long weekday = 0;
8 int c = 0;
9 Scanner scan = new Scanner(System.in);
10 String str = "1900-1-1";//1900-1-1是星期一
11 System.out.println("请输入年月(年-月):");
12 String str1 = scan.next();
13 String str2 = str1 + "-1";//为了和1900-1-1到输入的时间计算出差多少天而加上字符"-1"
14 String str3 = null;
15 long yearDays = charge(str,str2);//计算出1900-1-1到输入的时间相差的天数
16 weekday = yearDays%7+1;//计算出一号一星期几
17 System.out.println(weekday);
18 String str4 = str1.substring(5);//截取字符，截取到后面的月份
19 int num = 0;
20 num=Integer.valueOf(str4);
21 String str5 = str1.substring(0,4);
22
23 int num1 = 0;
24 num1 = Integer.valueOf(str5);//把截取到的字符月份转换为整形
25 switch (num)
26 {
27 case 1:
28 case 3:
29 case 5:
30 case 7:
31 case 8:
32 case 10:
33 case 12:
34 c = 31;
35 break;
36 case 4:
37 case 6:
38 case 9:
39 case 11:
40 c = 30;
41 break;
42 case 2:
43 {
44 //判断是否为闰年
45 if ((num1%4 == 0 && num1%100 != 0) || num1 % 400 ==0)
46 {
47 c = 29;
48 }else {
49 c = 28;
50 }
51 }
52 break;
53 }
54 System.out.println("星期日\t"+"星期一\t"+"星期二\t"+"星期三\t"+"星期四\t"+"星期五\t"+"星期六\t");
55 if(weekday%7!=0){//判断星期天是不是一号，是就不打印*号
56 for (int i = 1; i <= weekday ; i++)//打印*号
57 {
58
59 System.out.print(" *"+"\t");
60
61 }
62 }
63 int day=0;
64 for (int i = (int)weekday ; i < c+ (int)weekday ; i++ )//打印每天的号数
65 {
66 day++;//每天号数记录
67 if ((i) % 7 == 0)
68 {
69 System.out.println();
70 }
71 System.out.print(" "+day+"\t");
72 }
73 }
74
75 public static long charge(String date1,String date2){
76
77 //做时间差
78 //将String转为Date做计算
79 SimpleDateFormat sd = new SimpleDateFormat("yyyy-MM-dd");
80 long charge = 0;
81 try{
82 Date d1 = sd.parse(date1);
83 Date d2 = sd.parse(date2);
84 //时间也是以毫秒为单位。
85 charge = (d2.getTime() - d1.getTime()) / (1000*24*60*60);
86 }catch(ParseException e){
87 System.out.println(e);
88 }
89 return charge;
90 }
91 }
