Re: sorting in order of values

From:

Eric Sosman <Eric.Sosman@sun.com>

Newsgroups:

comp.lang.java.programmer

Date:

Wed, 16 Aug 2006 11:06:08 -0400

Message-ID:

<1155740769.462300@news1nwk>

Shikha wrote On 08/16/06 09:25,:

Try just putting the (key,value) pairs in an ordinary HashMap.
When you want to visit all the values (or all the pairs) in order
by value, use .values() to extract the values (or .entrySet() to
extract the pairs), sort them, and traverse the sorted data instead
of the original Map.

you mean to say that i should get the values and put them in an
arraylist and then access the values from the arraylist instead of
getting them from the map ?

Eric, I was about to try this out but i realised that this wouldnt
work. Because i need to populate the values from a Map. the reason
being that when the user selects a particular value i need to pick the
corresponding key for the value. so if i populate the values from
arraylist i wouldnt be able to get the corresponding id.

If you need the (key,value) pairs sorted by value, not
just the values themselves, use theMap.entrySet() to get
them: it gives you a Collection of Map.Entry objects, each
representing one (key,value) pair. Sort that Collection of
pairs using a Comparator that looks at the values.

--
Eric.Sosman@sun.com