I have an ArrayList
which contains dates with a format (Satuday,4 Februray 2012). How can I sort this ArrayList
?
这是最简单的排序方法之一,
Collections.sort(<Your Array List>);
If you have any special requirements while sorting, so you may do it by providing your own Comparator
. For example:
//your List
ArrayList<Date> d = new ArrayList<Date>();
//Sorting
Collections.sort(d, new Comparator<Date>() {
@Override
public int compare(Date lhs, Date rhs) {
if (lhs.getTime() < rhs.getTime())
return -1;
else if (lhs.getTime() == rhs.getTime())
return 0;
else
return 1;
}
});
The key element is that you are converting your Date
object into milliseconds (using getTime()
) for comparison.
After 8 years..
List<Date> dates = datelist;
List<Date> sorted = dates.stream()
.sorted(Comparator.comparingLong(Date::getTime))
.collect(Collectors.toList());
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