迭代列表并返回匹配的键

I have a java Multimap that contains an identifier mapped to a start date and an end date.

我有一个java Multimap，其中包含映射到开始日期和结束日期的标识符。

SetMultiMap<String,List<Date>> mymap = LinkedHashMultimap.create();

I am using this map in another method, where I want to retrieve all the keys whose end date is less than 1 week ago.

我在另一种方法中使用此映射，我想要检索结束日期小于1周前的所有键。

I tried this:

我试过这个：

DateTime lastWeek_joda = new DateTime().minusDays(7);
Date end_date = lastWeek_joda.toDate();

now i iterate as follows:

现在我迭代如下：

for (Map.Entry<String,List<date>> entry : mymap.entries()) 
    String key = entry.getKey();
    List<Date> value = entry.getValue();
    if (end_date.equals(value.get(1))) {
        key_set.add(key);
    }
}

This doesnt return me the expected result? Can this be done any easier/different? Thanks in advance.

这不会给我带来预期的结果吗？这可以更容易/不同吗？提前致谢。

2 个解决方案

#1

You are checking for dates that exactly equal the week-prior-date. Instead, use compareTo and check if the week-prior-date is greater than (later than) the current value.

您正在检查与周前日期完全相同的日期。而是使用compareTo并检查周前日期是否大于（晚于）当前值。

for (Map.Entry<String,List<date>> entry : mymap.entries()) 
    String key = entry.getKey();
    List<Date> value = entry.getValue();
    if (end_date.compareTo(value.get(1)) > 0) {
        key_set.add(key);
    }
}

#2

 for (Map.Entry<String,List<date>> entry : mymap.entries()) 
    String key = entry.getKey();
    List<Date> value = entry.getValue();
    if (checkDateRange(value.get(1))) {
        key_set.add(key);
    }
}

public boolean checkDateRange(Date tDate)  {
    Date date = new Date();
    Calendar c = Calendar.getInstance();
    c.setTime(date);
    int i = c.get(Calendar.DAY_OF_WEEK) - c.getFirstDayOfWeek();
    c.add(Calendar.DATE, -i - 7);
    Date start = c.getTime();
    c.add(Calendar.DATE, 6);
    Date end = c.getTime();

    //your logic goes here
     if(start<=tDate<=end){
        return true;
     }
    return false;
   }