public static <K extends Comparable<? super K>, V > Map<K, V> sortByKey(Map<K, V> map) {
Map<K, V> result = new LinkedHashMap<>();
map.entrySet().stream()
.sorted(Map.Entry.<K, V>comparingByKey()
).forEachOrdered(e -> result.put(e.getKey(), e.getValue()));
return result;
}
