求算法。我已经有一种方法，但是貌似不对

Question

java，算法

Answer 1

兄弟，吧你的代码弄了一下，
1  SimpleDateFormat sdf = new SimpleDateFormat("yyyyww"); 这里你开始是要取1月和12月的时间，而不是1周和12周的时间，所以要改成 SimpleDateFormat sdf = new SimpleDateFormat("yyyyMM"); 
   在week数组赋值前增加这样一句，换成取得周的： sdf = new SimpleDateFormat("yyyyww");
                weeks[i] = sdf.format(cal.getTime()); public static String getWeek(String startDate,String endDate)
    {
        String[] weeks = null;
        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMM");
        try {
            Date start = sdf.parse(startDate);
            Date end = sdf.parse(endDate);            Long l = end.getTime() - start.getTime();
            Long l2= l/(1000*3600*24*7);
            System.out.println(l2);
            int length = l2.intValue()+1;
            Calendar cal = Calendar.getInstance();
            cal.setTime(start);
            weeks = new String[length];
            for(int i = 0;i<length;i++)
            {
                cal.add(Calendar.WEEK_OF_YEAR, i);
                sdf = new SimpleDateFormat("yyyyww");
                weeks[i] = sdf.format(cal.getTime());
                System.out.println("the week:"+weeks[i]);
                if(i!=0)
                {
                    cal.add(Calendar.WEEK_OF_YEAR, -i);
                }
            }
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return null;
    }=============================运行结果
the week:201405
the week:201406
the week:201407
。。
the week:201446
the week:201447
the week:201448