Synchronize a Map

I try to synchronize the entries into a SortedMap, but it doesn't work. I use time in millisecond as key and an Integer as value. The put-Method is in a synchronized block but sometimes the key is overridden because time was to short or something like that.
How can I make sure not to override anything? How can I get different times?
I know it sounds strange, actually it is strange but i don't know how to explain better.
I need a synchronizable collection.
Thanks for help!

Here is my code
public synchronized void myMethod(int i) {
Calendar cal = Calendar.getInstance();
try {
if (i % 2 == 0) {
long time = cal.getTime().getTime();
map.put(new Long(time), new Integer(i));
} else {
long time = cal.getTime().getTime();
map.put(new Long(time), new Integer(i));
} catch (Exception e) {
System.out.println(e.toString());
System.out.println("myMethod i " + i + " map " + map);
I also tried containsKey() - didn't work.

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808239 wrote:
I have a Map<Integer, List<T>> data, and all the lists are initialized using Collections.synchronizedList().Seems like overkill to me. Your Map also looks like a Multimap, of which there are several existing implementations.
When I do the traversal, I want to traverse ALL lists in the map at the same timeI suspect not. What you want to do is to traverse each one in sequence.
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