根据员工入职时间和合同期计算下一次合同签订时间

 1 import java.text.SimpleDateFormat;
 2 import java.util.Calendar;
 3 import java.util.Date;
 4 import java.util.GregorianCalendar;
 5 import java.util.Scanner;
 6 
 7 public class ContractDate {
 8 
 9     /**
10      * @param args
11      *            2 根据员工入职时间和合同期计算下一次合同签订时间
12      *             a 入职时间为指定格式字符串 
13      *             b 合同期单位为月 
14      *             c下次合同签订时间为到期前一个月份的工作日（遇到周六，周日顺延到下周一） 
15      *             d 返回值为指定格式的字符串
16      * @throws Exception
17      */
18     public static void main(String[] args) throws Exception {
19         // TODO Auto-generated method stub
20         Scanner console = new Scanner(System.in);
21         System.out.println("请输入入职时间：");
22         String str = console.nextLine();
23 
24         Scanner sc = new Scanner(System.in);
25         System.out.println("请输入合同期（单位：月）：");
26         int contractMonths = sc.nextInt();
27         String exp = agreement(str, contractMonths);
28         System.out.println("签订日期为：" + exp);
29     }
30 
31     public static String agreement(String str, int contractMonths)
32             throws Exception {
33         SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
34         // 将字符串形式的日期转化为Date格式的日期
35         Date d = sdf.parse(str);
36         Date date = expDate(d, contractMonths);
37         String exp = sdf.format(date);
38         return exp;
39     }
40 
41     @SuppressWarnings("unused")
42     public static Date expDate(Date entryDay, int months) {
43         Calendar cal = new GregorianCalendar();
44         cal.setTime(entryDay);
45         cal.add(Calendar.MONTH, months);
46         cal.add(Calendar.MONTH, -1);
47         //测试  合同到期前一个月的日期为一个星期的第几天
48         System.out.println(cal.get(Calendar.DAY_OF_WEEK));
49         int dayOfWeek=cal.get(Calendar.DAY_OF_WEEK);
50         //测试   星期天为第几天
51         System.out.println(Calendar.SUNDAY);
52 //        if (dayOfWeek== Calendar.SUNDAY || dayOfWeek == Calendar.SATURDAY) {
53 //            cal.add(Calendar.WEEK_OF_MONTH, 1);
54 //            cal.set(Calendar.DAY_OF_WEEK, 0);
55 //            date = cal.getTime();
56 //        } else
57 //            date = cal.getTime();
58         int plus = 0;
59         if(dayOfWeek == Calendar.SUNDAY){
60             plus = 1;
61         }else if(dayOfWeek == Calendar.SATURDAY){
62             plus = 2;
63         }
64         cal.add(Calendar.DATE, plus);
65         Date date=cal.getTime();
66         return date;
67     }