Java–Sort a Map by Values
By admin on Apr 7, 2012 in Java, Programming
Here is a generic method to sort a Map by its values
1: /**
2: * Sort a map by values
3: *
4: * @param map Unsorted map
5: * @return Sorted map
6: */
7: public static <K, V extends Comparable<? super V>> Map<K, V> sortByValue(Map<K, V> map) {
8: List<Map.Entry<K, V>> list = new LinkedList<Map.Entry<K, V>>(map.entrySet());
9: Collections.sort(list, new Comparator<Map.Entry<K, V>>() {
10: public int compare(Map.Entry<K, V> o1, Map.Entry<K, V> o2) {
11: return (o1.getValue()).compareTo(o2.getValue());
12: }
13: });
14:
15: Map<K, V> result = new LinkedHashMap<K, V>();
16: for (Map.Entry<K, V> entry : list) {
17: result.put(entry.getKey(), entry.getValue());
18: }
19: return result;
20: }
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