Question

Possible Duplicate:
Iterating through a LinkedHashMap in reverse order

How to traverse Linked Hash Map in a reverse order? Is there any predefined method in map to do that?

I’m creating it as follows:

LinkedHashMap<Integer, String> map = new LinkedHashMap<Integer,String>();
map.put(1, "one");
map.put(2, "two");
map.put(3, "three");

Answer 1

List<Entry<Integer,String>> list = new ArrayList<>(map.entrySet());

for( int i = list.size() -1; i >= 0 ; i --){
    Entry<Integer,String> entry = list.get(i);
}

Not really pretty and at the cost of a copy of the entry set, which if your map has a significant number of entries might be a problem.

The excellant Guava library have a [List.reverse(List<>)][2] that would allow you to use the Java 5 for each style loop rather than the indexed loop:

//using guava
for( Entry entry : Lists.reverse(list) ){
    // much nicer
}