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copied!<p>You could use a <code>NavigableMap</code> which allows you to query a range of numbers (head, tail). A thread safe implementation is <code>ConcurrentSkipListMap</code>.</p> <p>In particular look the the methods <code>NavigableMap<K,V> headMap(K toKey, boolean inclusive)</code>, <code>NavigableMap<K,V> tailMap(K fromKey, boolean inclusive)</code> and <code>SortedMap<K,V> subMap(K fromKey, K toKey)</code></p> <p>Example </p> <pre><code>//your existing concurrent map changed to concurrent navigable map NavigableMap<Long, Long> throughputCounter = new ConcurrentSkipListMap<Long, Long>(); // this prints for inclusive values - 1 and 20 are both included System.out.println("How many calls(X number) came back in between 1 and 20 ms:" + calcThroughput(throughputCounter.subMap(1L, true, 20L, true))); System.out.println("How many calls(X number) came back in between 20 and 40 ms:" + calcThroughput(throughputCounter.subMap(20L, true, 40L, true))); System.out.println("How many calls(X number) came back in between 40 and 60 ms:" + calcThroughput(throughputCounter.subMap(40L, true, 60L, true))); System.out.println("How many calls(X number) came back in between 60 and 80 ms:" + calcThroughput(throughputCounter.subMap(60L, true, 80L, true))); System.out.println("How many calls(X number) came back in between 80 and 100 ms:" + calcThroughput(throughputCounter.subMap(80L, true, 100L, true))); System.out.println("How many calls(X number) came back in after 100 ms:" + calcThroughput(throughputCounter.tailMap(100L))); private Long calcThroughput(NavigableMap<Long, Long> subMap) { Long sumOfARange = new Long(0); for (Long value : subMap.values()) { sumOfARange += value; } return sumOfARange; } </code></pre>

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