public static void sortbykey() { ArrayList sortedKeys = new ArrayList<>(hash_map.keySet()); Collections.sort(sortedKeys); for (Double x : sortedKeys) System.out.println("Key = " + x + ", Value = " + hash_map.get(x)); } This code can sort my hash_map by keys and print values in order but I just want to see max 5 keys and values not all sorted hash_map