HFTHashMap<String, Integer> map = new HFTHashMap<>(); map.put("key1", 1); map.put("key2", 2); int value = map.get("key1"); for (Map.Entry<String, Integer> entry : map.entrySet()) { System.out.println(entry.getKey() + " - " + entry.getValue()); } map.remove("key2"); map.put("key1", 10);